Mar. 2021, 北海道大学大学院工学研究院, 若手教員奨励賞　　　　　　　　　　　　　　　
本田真也

Apr. 2017, JSME, Best Paper Award of JSME　　　　　　　　　　　　　　　
双安定性を有する複合材シェルのスナップスルー変形に関する多目的最適化
Shinya HONDA;Keisuke Takahashi;Yoshihiro Narita

Aug. 2015, 日本機械学会 機械力学計測制御部門, オーディエンス表彰　　　　　　　　　　　　　　　
双安定性を有する複合材シェルのスナップスルー変形に関する多目的最適化
本田真也

Apr. 2011, 日本機械学会, 奨励賞(研究)　　　　　　　　　　　　　　　
局所的な異方性を有する繊維強化複合材料の解析と最適設計の研究
本田真也

Jan. 2011, 第53回自動制御連合講演会, 優秀発表賞　　　　　　　　　　　　　　　
積層複合材のスマート化による振動制御を目的とした統合最適化
本田真也

Apr. 2007, Association for Simulation and Mulitidisciplinary Design Optimization, Excellent Papaer Award　　　　　　　　　　　　　　　
Minimum weight design for vibration of laminated plates using lamination parameters
Shinya HONDA;Yoshihiro NARITA

Mar. 2007, 日本機械学会, 三浦賞　　　　　　　　　　　　　　　
第501号
本田真也

電着樹脂含浸CFRPの通電条件と力学特性の関係
清水 佑音, 本田 真也, 佐々木 克彦, 武田 量, 片桐 一彰
日本複合材料学会誌, 51, 3, May 2025, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal, 46590037

Investigation of manufacture variables on the mechanical properties of CFRP prepared by electrodeposition resin molding method
Md Tansirul Islam, Shinya Honda, Kazuaki Katagiri, Katsuhiko Sasaki, Ryo Takeda
Mechanics of Advanced Materials and Structures, 1, 16, Informa UK Limited, 18 Jan. 2024, [Peer-reviewed]
English, Scientific journal

Vibration Design of Composites with Nonlinear Fiber Shapes Fabricated by Tailored Fiber Placement Machine and Electrodeposition Resin Molding Method
Shinya Honda, Isamu Saiwaki, Kazuaki Katagiri, Katsuhiko Sasaki, Ryo Takeda
2023 IUTAM Symposium on Nonlinear dynamics for design of mechanical systems across different length/time scales, Aug. 2023, [Peer-reviewed], [Invited], [Lead author, Corresponding author]
International conference proceedings, 31613957

Analytical and Experimental Study for Vibration of Laminated Rectangular Plates with Point Masses
Shinya Honda, Katsuhiko Sasakir, Yoshihiro Narita
Science and Engineering (EICSE 5th edition), Trans Tech Publications Ltd, 23 Jun. 2023, [Peer-reviewed], [Lead author, Corresponding author]
Scientific journal, An analytical method is presented for free vibration of a symmetrically laminated rectangular plate with point masses, and experimental modal analysis is conducted to compare both sets of the frequency data. The problem is solved by an extending Ritz method to include kinetic energy caused by added point masses under any sets of edge conditions, and a frequency equation is derived by minimizing the energy functional. In numerical computation, the accuracy of the solution is studied by convergence test and comparison with the existing result in the specific case. Then, the experimental modal analysis is applied to measure the natural frequencies and mode shapes. The two sets of results are compared, and the validity of both theoretical and experimental approaches is established.

Stent Geometry Optimization for In-Stent Restenosis Prevention Through Fluid–Structure Interaction Analysis
Varien Janitra Nuralif Susanto, Ryo Takeda, Shinya Honda, Katsuhiko Sasaki
Lecture Notes in Mechanical Engineering, 98, 105, 2023
International conference proceedings, Heart attacks are the most common cause of death in the world in the last decade. Heart attacks are caused by a deficiency of nutrients in the heart muscle cells due to blood flow blockage. Blocked blood flow can be restored by the deployment of a medical device called a stent. However, many studies found that stent deployment may induce plaque formation, known as in-stent restenosis. Previously, there have been attempts to minimize in-restenosis occurrence on stents by redesigning the stent. Optimization algorithms and numerical simulations are employed to search for the best stent design according to preset objective functions and constraints. This paper studies the optimum stent configuration considering the extensively studied restenosis risk factors, such as intimal stress and wall shear stress. For the optimization, a genetic-based optimization algorithm (GA) was used. The risk factors occurrence is analyzed by coupling finite element method (FEM) and computational fluid dynamics (CFD) solvers. Several conflicting objective functions based on the analyzed risk factors and constraints are also applied to the optimization algorithm. As a result, optimum stent configurations are obtained, which have the best size and angles of struts.

Effect of Heat Curing Temperature for CFRP Fabricated by Electrodeposition Resin Molding Method
Md Tansirul Islam, Shinya Honda, Kazuaki Katagiri, Katsuhiko Sasaki, Ryo Takeda
Proceedings of the American Society for Composites - 38th Technical Conference, ASC 2023, 115, 123, 2023
International conference proceedings, The new electrodeposition resin molding (EDRM) technique is regarded as a rapid and effective way to produce composite materials. In this study, the composite preparation was done using this technique. The heat curing stage is one of the key steps in this process. The optimization of the many conditions was required because it is a new method. The major objective of this study is to establish the ideal heat curing temperature and time for producing CFRP of the highest grade. In this investigation, two alternative temperature profiles were used. One measured 215°C, the other 230°C. Three different heat curing times-4 hours, 6 hours, and 8 hours-were used for each profile. Static and dynamic characteristics of the prepared CFRP were assessed to determine the impact of these heat curing temperatures and treatment times. Four-point bending tests were done for the static properties, and vibration tests were done for the dynamic qualities to determine the natural frequency and damping. Even though the various heat treatment methods had little impact on vibration characteristics, they had a big impact on bending qualities. The specimens that were held in the oven for 8 hours at 215°C to produce the highest bending strength, however at 230°C, the maximum bending strength was found when it was kept for 6 hours in the oven for treatment.

Impact properties of carbon fiber/cellulose nanofiber reinforced epoxy composite using asymmetric stacking sequence of non-hydrophobic cellulose nanofiber dispersion layer
Kazuaki Katagiri, Naoko Kishimoto, Haruna Yamaguchi, Toshihiko Okumura, Sonomi Kawakita, Shinya Honda, Katsuhiko Sasaki
Mechanics of Advanced Materials and Structures, 30, 19, 3965, 3978, TAYLOR & FRANCIS INC, 2023
English, Scientific journal, Cellulose nanofibers (CNFs) are sustainable materials with high specific strengths. To enhance the impact properties of carbon fiber reinforced plastics (CFRPs), the authors have developed an efficient process for incorporating a non-hydrophobized CNF dispersion layer into CFRPs. In this study, the impact properties of CFRP with asymmetrically stacked CNF dispersion layer was investigated by conducting the instrumented Charpy impact tests. Two types of CNFs were used for comparison. Consequently, by inserting the CNF dispersion layer into the opposite side of the striking surface, the Charpy impact value increased by 26% compared to CFRP without CNF dispersion layer.

Manufacturability and Deformation Performances of CFRP Twist Morphing Wing Structure with Applying the Electrodeposition Resin Molding Method
Kazuaki Katagiri, Daekwi Kim, Choong Sik Park, Sonomi Kawakita, Masato Tamayama, Koki Kayano, Shinya Honda, Katsuhiko Sasaki, Makoto Yamazaki
Lecture Notes in Electrical Engineering, 912, 879, 891, SPRINGER-VERLAG SINGAPORE PTE LTD, 2023
English, International conference proceedings, To achieve efficient flight by minimizing energy consumption, a morphing wing that allows large and smooth deformation similar to a wing of a migratory bird is required. Previously, the authors have developed a migratory-sized unmanned aerial vehicle (UAV) with a twist morphing wing. The twist morphing wing was manufactured using a carbon fiber reinforced plastics (CFRP) with applying the electrodeposition resin molding (ERM) method, which was developed by authors. In the ERM method, resin impregnation proceeds in a liquid by electrophoresis. Thus, manufacturing process is very efficient because neither pressurization nor evacuation are necessary. On the other hand, although the molding of the twist morphing wing is efficient, an optimal design is important for the twist morphing wing to lower the torsional rigidity to reduce the driving force of the morphing and increase the bending rigidity to support aerodynamic loads. Therefore, in this study, the spar of the twist morphing wing was designed to be arranged in a triangle. Furthermore, the twist morphing wing structures were fabricated by the ERM method, and by a 3D printer for benchmarking. So, torsion and bending deformation properties of the twist morphing wing were confirmed under the aerodynamic loading condition, and validated by finite element analysis. As a result, it was confirmed that the manufacturing efficiency of the ERM method was superior to that of the 3D printer. Additionally, the torsional rigidity of the twisted morphing wing was almost the same, regardless of the manufacturing method. Furthermore, the bending rigidity of the specimen manufactured by the ERM method was higher than that of the 3D printer.

Estimation of damping characteristics and optimization of curvilinear fiber shapes for composites fabricated by electrodeposition resin molding
Shinya Honda, Hiraku Takisawa, Ryo Takeda, Katsuhiko Sasaki, Kazuaki Katagiri
Mechanics of Advanced Materials and Structures, 30, 21, 4407, 4418, 2023, [Peer-reviewed], [Lead author, Corresponding author]
Scientific journal, The effect of both curvilinear fiber orientation and thickness distribution on modal damping of carbon fiber reinforced plastics (CFRP) fabricated by electrodeposition resin molding (ERM) was investigated. Tailored fiber placement (TFP) was used to manufacture carbon fiber (CF) performs with continuous curvilinear fiber paths or variable-axial properties. The damping of composites was calculated using the concept of specific damping capacity (SDC). Fiber shapes was optimized to maximize the first modal SDC using particle swarm optimization (PSO). As a result, the optimum fiber shape improves both the first natural frequency and modal SDC in comparison with several unidirectional fiber shapes.

Effects of stacking sequences of non-hydrophobic cellulose nanofiber dispersion layer on impact properties of carbon fiber/cellulose nanofiber reinforced epoxy composite
Kazuaki Katagiri, Naoko Kishimoto, Haruna Yamaguchi, Toshihiko Okumura, Sonomi Kawakita, Shinya Honda, Katsuhiko Sasaki
Mechanics of Advanced Materials and Structures, 30, 3, 582, 591, Informa UK Limited, 2023, [Peer-reviewed]
Scientific journal, Cellulose nanofibers (CNFs) are a plant-derived material with a high specific strength. The authors have developed a method to enhance the impact properties of carbon fiber reinforced plastics (CFRP) by inserting a non-hydrophobic CNF dispersion layer between prepregs. In this study, the specimens with different stacking sequence of the prepreg and CNF dispersion layer were manufactured, and the instrumented Charpy test was carried out. Analyzing the impact waveform, when the CNF dispersion layer was inserted below the surface prepreg, the Charpy impact value was increased by up to 6% compared to the CFRP without the CNF dispersion layer.

Adaptive Vibration Control of Smart Structure Using Deep Reinforcement Learning
Shinya Honda, Yuta Imura, Katsuhiko Sasaki, Ryo Takeda
EPI International Journal of Engineering, 5, 2, 92, 97, Center of Technology (COT), 31 Aug. 2022, [Peer-reviewed], [Lead author, Corresponding author]
Scientific journal, In this research, the authors developed an adaptive control method using deep reinforcement learning which is a kind of machine learning to suppress the vibration of smart structures. This method just requires information about the control response and input, and don’t require numerical models for the controlled object to design the controller. We experimented to verify the effectiveness of this method. In this experiment, a smart structure fabricated by an aluminum plate and a piezoelectric actuator was used as a controlled object. Three kinds of reinforcement learning algorithms are employed, Deep Q Network (DQN), Deep Deterministic Policy Gradient (DDPG), and Twin Delayed DDPG (TD3), and the control performance is compared. As a result, we succeeded in reducing the  norm of the frequency response to impulse disturbance by up to about 40 dB compared to the uncontrolled case. This demonstrates the applicability of the control method using deep reinforcement learning to adaptive vibration control.

Investigations into the Potential of Using Open Source CFD to Analyze the Differences in Hemodynamic Parameters for Aortic Dissections (Healthy versus Stanford Type A and B)
Ryo Takeda, Fumiya Sato, Hiroichi Yokoyama, Katsuhiko Sasaki, Nobuyuki Oshima, Akiyoshi Kuroda, Hideyoshi Takashima, Chenyu Li, Shinya Honda, Hiroyuki Kamiya
Annals of Vascular Surgery, 79, 310, 323, Elsevier BV, Feb. 2022, [Peer-reviewed]
Scientific journal, Background: The objective of this study was to develop a method to evaluate the effects of an aortic dissection on hemodynamic parameters by conducting a comparison with that of a healthy (nondissected) aorta. Open-source software will be implemented, no proprietary software/application will be used to ensure accessorily and repeatability, in all the data analysis and processing. Computed tomography (CT) images of aortic dissection are used for the model geometry segmentation. Boundary conditions from literature are implemented to computational fluid dynamics (CFD) to analyze the hemodynamic parameters. Methods: A numerical simulation model was created by obtaining accurate 3-dimensional geometries of aortae from CT images. In this study, CT images of 8 cases of aortic dissection (Stanford type-A and type-B) and 3 cases of healthy aortae are used for the actual aorta model geometry segmentation. These models were exported into an open-source CFD software, OpenFOAM, where a simplified pulsating flow was simulated by controlling the flow pressure. Ten cycles of the pulsatile flow (0.50 sec/cycle) conditions, totaling 5 sec, were calculated. Results: The pressure distribution, wall shear stress (WSS) and flow velocity streamlines within the aorta and the false lumen were calculated and visualized. It was found that the flow velocity and WSS had a high correlation in high WSS areas of the intermittent layer between the true and false lumen. Most of the Stanford type-A dissections in the study showed high WSS, over 38 Pa, at the systole phase. This indicates that the arterial walls in type-A dissections are more likely to be damaged with pulsatile flow. Conclusions: Using CFD to estimate localized high WSS areas may help in deciding to treat a type-A or B dissection with a stent graft to prevent a potential rupture.

Mechanical properties of the skeletal structure for UAV morphing wing by using CFRP with applying the electrodeposition resin molding method
Kazuaki Katagiri, Choong Sik Park, Sonomi Kawakita, Daekwi Kim, Masato Tamayama, Shinya Honda, Katsuhiko Sasaki, Makoto Yamazaki
AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022, American Institute of Aeronautics and Astronautics, 03 Jan. 2022, [Peer-reviewed]
International conference proceedings, One of the missions suitable for the fixed-wing unmanned aerial vehicles (UAVs) is long-distance flight such as surveillance. However, to save battery and engine output, it is very important to minimize the drag during flight control, which is mainly caused by the gaps and corners between the wing and aileron. Therefore, it is highly expected to develop a morphing wing without flaps and ailerons, which greatly deforms the surface like a bird. In this study, a spar arrangement of CFRP skeletal structure for the morphing wing of the UAV was designed by using the finite element method, and was manufactured by applying the electrodeposition resin molding (ERM) method. In the ERM method, resin can be impregnated between carbon fibers in the electrodeposition solution, thus, autoclaves and vacuum bagging are unnecessary. So, the ERM method was efficient to manufacture the skeletal structure. Further, carrying out the torsion and bending tests, smooth morphing deformation and sufficient strength were confirmed.

Vibration optimization of laminated composites with curvilinear reinforcing fibers for shell structures
SAIWAKI Isamu, HONDA Shinya, KATAGIRI Kazuaki, SASAKI Katsuhiko, TAKEDA Ryo
The Proceedings of the Dynamics & Design Conference, 2022, 145, The Japan Society of Mechanical Engineers, 2022
Japanese, Tailored Fiber Placement (TFP) is an embroidery technique that enables it possible to design free fiber shapes on base material sheets. The TFP generally creates curved fibers on a flat surface. However, CFRP structures are often used as shell structures rather than as flat plates, and there is not enough research to design fiber shapes on curved surfaces. In this research, we applied our previous optimization method for curved fiber shapes to shell structures. Curved fiber shapes were created by the linear combination of radial basis functions (RBFs) to represent complex fiber shapes. The fiber shape on a curved surface was represented by projecting the fiber shape on a plane surface using a coordinate transformation technique. Using this method, we investigated optimum fiber shapes to improve the first natural frequency of shell structure composites. The results showed that the optimum fiber shape gave higher natural frequencies than the linear fiber orientation. Obtained optimum fiber shape resulted in higher natural frequencies than the linear fiber orientation.

Damping identification and optimization of laminated composites with curved reinforcing fibers
Honda Shinya, Takisawa Hiraku, Katagiri Kazuaki, Sasaki Katsuhiko, Takeda Ryo
NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 66, 163, National Committee for IUTAM, 2022
Japanese, The effect of both curvilinear fiber orientation and the resulting thickness distribution on modal damping of carbon fiber reinforced plastics (CFRP) fabricated by electrodeposition resin molding (ERM) was investigated in this study. Tailored fiber placement (TFP) is employed to manufacture carbon fiber preforms with continuous curvilinear fiber paths. Damping of CFRP fabricated by ERM was calculated using the concept of specific damping capacity (SDC). Optimization of fiber shapes in L-shaped plate model was conducted to maximize the first modal SDC using particle swarm optimization (PSO). As a result, the optimum fiber shape successfully improves both the first natural frequency and modal SDC in comparison with several unidirectional fiber shapes.

Optimum design of curvilinear reinforcing fiber shapes for CFRP plates fabricated by electrodeposition resin molding method
本田真也, 瀧澤拓, 片桐一彰, 佐々木克彦, 武田量
日本機械学会最適化シンポジウム(CD-ROM), 14th, U00010, The Japan Society of Mechanical Engineers, 2022
Japanese, Fiber shape optimization was performed to improve the damping properties of CFRP fabricated by electrodeposition resin molding (EDRM) method. Damping properties of composites were modeled by the specific damping capacity (SDC), and the material damping parameters required for numerical estimation were identified by an inverse analysis using results of experimental modal analysis and finite element analysis. In the optimization, a curvilinear fiber shape that maximizes the first mode SDC was explored. The thickness distribution due to the curvilinear fiber shape was estimated and applied to the finite element analysis. The fiber shapes obtained by the optimization improved the first natural frequencies and mode SDCs compared to several straight fiber orientations, indicating that the curved fiber orientation is effective in improving damping.

Effects of cellulose nanofiber content on impact properties of carbon fiber reinforced epoxy composites with the cellulose nanofiber dispersion layer
Kazuaki Katagiri, Naoko Kishimoto, Toshihiko Okumura, Sonomi Kawakita, Shinya Honda, Katsuhiko Sasaki
Mechanics of Advanced Materials and Structures, 29, 27, 6087, 6095, Informa UK Limited, 2022, [Peer-reviewed]
Scientific journal, Cellulose nanofibers (CNFs) are environmentally friendly materials with a high specific strength. To enhance the impact properties of the carbon fiber reinforced plastics (CFRPs), a method for inserting a CNF dispersion layer between prepregs was developed. By using an aqueous solution of epoxy resin, the hydrophobic treatment of CNF became unnecessary. In this study, CFRP with CNF dispersion layers was fabricated with different CNF content. The impact energy absorbed by the CFRP specimen was increased with the increasing CNF content, and the Charpy impact value increased up to a maximum of 21% by the CNF dispersion layers. Highlights Carbon fiber reinforced plastics (CFRPs) specimens with the cellulose nanofiber (CNF) dispersion layer were fabricated. The specimens were fabricated by varying the content of CNF. Impact energy absorbed by the CFRP specimen was increased with increased CNF content. Charpy impact value increased up to 21%; optimum ductility index value was clarified.

Enhancement of impact properties of CFRP by inserting the non-hydrophobized cellulose nanofiber dispersion layer using an aqueous solution of epoxy resin
Kazuaki Katagiri, Toshihiko Okumura, Sonomi Kawakita, Hirosuke Sonomura, Shinya Honda, Katsuhiko Sasaki
Mechanics of Advanced Materials and Structures, 29, 26, 5350, 5359, Informa UK Limited, 2022, [Peer-reviewed]
Scientific journal, Cellulose nanofibers (CNFs) are environmental-friendly nanofiller with high strength and lightweight. To improve the impact properties of carbon fiber reinforced plastics (CFRPs), the application of CNF is expected. However, hydrophobic treatment was unavoidable due to its hydrophilicity. In this study, by adopting an aqueous solution of epoxy resin, the CFRP with CNF dispersion layer was fabricated. From the instrumented Charpy test, it was revealed that the waveform of impact force has two peaks, and the second peak was enlarged by the CNF dispersion layer. As a result, Charpy impact value of the CFRP was increased up to 6%. Highlights: A novel method to enhance the impact properties of carbon fiber reinforced plastic (CFRP) by using cellulose nanofiber (CNF) was developed. By dispersing CNFs in an aqueous epoxy solution, hydrophobic treatment was eliminated. Inserting the CNF dispersion layer increased the Charpy impact value of CFRP up to 6%.

Dehydration dynamics model with Monte Carlo Method for a front-loading washer/dryer
Yasuyuki Joko, Shinya Honda
Mechanics of Advanced Materials and Structures, 29, 26, 4934, 4941, Informa UK Limited, 2022, [Peer-reviewed]
Scientific journal, In this study, we aimed to improve the efficiency of an anti-vibration design for front-loading washer/dryers and propose a dehydration dynamics model that combines a mechanical model with a random algorithm. In addition to the anti-vibration structure, front-loading washer-dryers are equipped with dehydration start control where dehydration is repeated until the level of vibration detected during dehydration falls below the threshold. The proposed model focuses on the probability distribution of clothing behavior during dehydration and models the clothing behavior by using a random number that follows the probability distribution. Then, we present the reusability of the probability distribution and the difference from a mechanical model that does not consider clothing. In this way, in the upstream design without the actual machine, the anti-vibration structure and dehydration start control could be simultaneously designed, improving the efficiency of the anti-vibration design.

Enhancement method of CFRP with the non-hydrophobized cellulose nanofibers using aqueous electrodeposition solution
Kazuaki Katagiri, Shinya Honda, Toshihiko Okumura, Shimpei Yamaguchi, Sonomi Kawakita, Kazuhiro Kume, Katsuhiko Sasaki
Mechanics of Advanced Materials and Structures, 29, 26, 4631, 4638, Informa UK Limited, 2022, [Peer-reviewed]
Scientific journal, An efficient method to increase specific strength of carbon fiber reinforced plastics (CFRP) by using cellulose nanofibers (CNFs) was developed. Eliminating a complex hydrophobic treatment of CNF by using aqueous electrodeposition solution (EDS) containing a polymer with epoxy group, the CFRP with CNF/resin layer was fabricated. The effects of the CNF/resin layer on the bending properties of CFRP were clarified by varying the weight fractions of CNF. The specific flexural rigidity and strength of the CFRP with CNF/resin layer were increased to approximately 3.5 times and 1.8 times those of the CFRP without CNF/resin layer, respectively.

Analysis and optimization for vibration of laminated rectangular plates with blended layers
Michio Innami, Shinya Honda, Katsuhiko Sasaki, Yoshihiro Narita
Composite Structures, 274, 114400, 114400, Elsevier BV, 15 Oct. 2021, [Peer-reviewed]
Scientific journal, An accurate and straightforward analytical method is proposed for the free vibration of a laminated composite rectangular plate with blended layers. The plate with blended layers is defined here as a laminated plate where some of the outer layers are composed of multiple subareas with different orientation angles of straight fibers. A finite element code is developed as well to verify accuracy of the proposed method. In numerical comparison, the natural frequencies calculated by the present method agree well with those from the FEM code for rectangular plates with two, three, four and five subareas. Subsequently, the use of this analytical method is tested in vibration optimization, i.e. design for maximization of fundamental frequencies. This frequency optimization is formulated by changing the fiber orientation angles in multiple subareas simultaneously, and is carried out by using permutation in simple cases and by Genetic Algorithm (GA) for a larger number of frequency calculations. It is observed that introduction of blended layers is very effective approach to design the dynamic characteristics of laminated composite plates.

Manufacturing method of the morphing wing structure for UAV by CFRP with applying the electroformed resin molding method
Kazuaki Katagiri, Choong Sik Park, Shimpei Yamaguchi, Sonomi Kawakita, Kim Daekwi, Shinya Honda, Katsuhiko Sasaki, Masato Tamayama
36th Technical Conference of the American Society for Composites 2021: Composites Ingenuity Taking on Challenges in Environment-Energy-Economy, ASC 2021, 1, 3, 10, Destech Publications, Inc., 20 Sep. 2021
International conference proceedings, Aircraft flight control usually requires driving flaps and ailerons. However, the air drags increase significantly due to the corners of flaps and aileron. Especially, the gap between mother wing and flap / aileron causes a drag increase. Therefore, studies are being conducted on morphing wings that smoothly and greatly deform the wing surface. For aircraft wing, it is needless to say that strength is important to sustain lift and drag for the aircraft during the flight. For morphing wings, in addition, actuators must be mounted inside the wing to enable the morphing deformation. Moreover, for the aircraft wing, weight is quite important. Therefore, carbon fiber reinforced plastic (CFRP) is currently most suitable for aircraft wing structural materials. However, it is difficult to mold CFRP so that it has sufficient strength and can be morphed. In this study, by using CFRP, the morphing wing structure was prototyped with targeting a small unmanned aerial vehicle (UAV) weighing 3 kg. The CFRP lattice structure that enables morphing deformation was designed and manufactured by applying the electrodeposition resin molding (ERM) method which was developed by the authors. In the ERM method, firstly, the carbon fiber was fixed with a jig according to the designed morphing wing structure, and immersed in the electrodeposition solution. Secondly, the epoxy polymer particle in the solution were electrophoresed and impregnated between carbon fibers. After thermal curing, the morphing wing structure was fabricated. Further, the loading-unloading torsion and bending tests of the morphing wing structure were carried out. Smooth morphing deformation and sufficient strength were confirmed.

Tensile strength of CFRP with curvilinearly arranged carbon fiber along the principal stress direction fabricated by the electrodeposition resin molding
Kazuaki Katagiri, Shinya Honda, Shota Nakaya, Takahiro Kimura, Shimpei Yamaguchi, Hirosuke Sonomura, Tomoatsu Ozaki, Sonomi Kawakita, Mamoru Takemura, Katsuhiko Sasaki
Composites Part A: Applied Science and Manufacturing, 143, Apr. 2021, [Peer-reviewed]
English, Scientific journal, To strengthen carbon fiber reinforced plastics (CFRPs), fiber placement along the principal stress directions have been studied as a promising approach. However, a method to sufficiently impregnate a resin between the curved carbon fibers has not established thus far, although arbitrary arrangement of carbon fibers is feasible using the automated fiber placement (AFP) machine. Previously, the authors had developed an electrodeposition resin molding method based on electrophoresis. In this method, the carbon fiber preforms sewn by the AFP machine is immersed in the electrodeposition solution containing polymers with epoxy groups, and optimal current is applied to impregnate resin between carbon fibers. In this study, we showed that a CFRP specimen could be fabricated with arranging the carbon fibers along the principal stress direction, resulting in approximately 10% higher tensile strength than that of the specimen with unidirectional carbon fibers.

Optimal design and evaluation with ground structure based topology optimization
KAYANO Koki, HONDA Shinya, KATAGIRI Kazuaki, SASAKI Katsuhiko, TAKEDA Ryo
The Proceedings of the Dynamics & Design Conference, 2021, 129, The Japan Society of Mechanical Engineers, 2021
Japanese, The aim of this study is to design an optimum CFRP lattice structure for application to a morphing wing. The ground structure based topology method is adopted as the optimization method, and the results are validated by experiments. In this study, to confirm the effectiveness of the optimization method, a simple hook shape was optimized and its stiffness and strength was compared by tensile tests. A 3D printer capable of laminating thermoplastic CFRP was used to fabricate the specimen. The results of tensile tests showed that the optimized specimens exhibited higher stiffness and strength than the reference model, confirming the effectiveness of the proposed method.

Enhancement of the bending strength of I-shaped cross-sectional beam of CFRP by dispersing cellulose nanofibers without hydrophobic treatment on the surface
Kazuaki Katagiri, Shinya Honda, Sayaka Minami, Shimpei Yamaguchi, Hirosuke Sonomura, Ozaki Tomoatsu, Sonomi Kawakita, Sohei Uchida, Masayuki Nezu, Mamoru Takemura, Yayoi Yoshioka, Katsuhiko Sasaki
Mechanics of Advanced Materials and Structures, 28, 11, 1089, 1097, 2021, [Peer-reviewed]
English, Scientific journal, © 2019, © 2019 Taylor & Francis Group, LLC. Many researches on strengthening the matrix of Carbon Fiber Reinforced Plastic (CFRP) using cellulose nanofibers (CNFs) have been reported. However, hydrophobic treatment to modify the surface of CNFs is indispensable. Authors previously showed that the bending properties of CFRP were enhanced by CNF without hydrophobic treatment after the electro-activated deposition resin molding (ERM) method. CNF can be dispersed on the surface of CFRP since the electro-activated deposition solution is water based. In this study, first, it was confirmed that the tensile properties of CFRP could be enhanced by CNF dispersed on the surface after the ERM method. Also, the weight fraction of CNF was optimized to maximize the tensile properties. Second, the I-shaped cross-sectional beam (I-beam) was molded by laminating the CFRP with CNF dispersed on the surface. It was confirmed that the bending properties of the CFRP I-beam was enhanced by CNF, and the effect of CNF on the interlaminar strength was evaluated.

Vibration characteristics of carbon fiber reinforced composites fabricated by electrodeposition molding method
Hiraku Takisawa, Naoki Hashimoto, Shinya Honda, Kazuaki Katagiri, Katsuhiko Sasaki, Ryo Takeda
15th International Conference on Motion and Vibration Control, MoViC 2020, Paper ID: 10018, 07 Dec. 2020, [Peer-reviewed]
English, International conference proceedings, The present paper investigates the vibration characteristics of CFRPs including the anisotropic damping properties. Carbon fiber (CF) preforms are prepared by a tailored fiber placement (TFP) machine, and the electrodeposition resin molding (ERM) method is used to impregnate the resin into CF preforms. CFRP plates are fabricated by two different methods which are the ERM and vacuumed assisted resin transfer molding (VaRTM), and experimental modal analysis is conducted to compare the vibration characteristics of those plates. The experimental results show plates fabricated by the ERM exhibit higher damping properties than those by VaRTM. Then, anisotropic damping properties of the present CFRP plates composed of plain weave layers and TFP layers are identified using the finite element analysis (FEA) with the experimental results. In this analysis, the damping properties are modeled by specific damping capacity (SDC) that is defined as the ratio of the dissipated energy and the maximum strain energy in one cycle of loading. Those parameters are determined by minimizing the difference between modal SDCs calculated by the FEA and measured by the experiment. To solve the minimization problem, particle swarm optimization (PSO) is used. Obtained damping parameters enable us to design damping properties more flexibly for CFRPs with arbitrarily shaped fibers.

Manufacturing method of the heat-storable carbon fiber reinforced plastics with applying trans-1,4-polybutadiene by using cellulose nanofibers and electrodeposition solution
Kazuaki Katagiri, Tsuyoshi Totani, Takuya Isono, Ryohei Goto, Shimpei Yamaguchi, Sonomi Kawakita, Tomoatsu Ozaki, Hirosuke Sonomura, Sayaka Minami, Shinya Honda, Katsuhiko Sasaki
Journal of Energy Storage, 31, 101636, 101636, Elsevier BV, Oct. 2020, [Peer-reviewed]
English, Scientific journal, For the thermal management of electric devices, the application of phase change materials (PCMs) such as paraffin has been studied. However, as long as the PCM changes to liquid phase, a sealed structure is required, which is a constraint for weight reduction. Therefore, the authors have focused on trans-1,4-polybutadiene (TPBD), a semi-crystalline polymer that accumulates heat by crystal structure transition at 50~80 °C in the solid phase. However, the strength of TPBD is insufficient and thermal conductivity is not enough to dissipate the heat. In this study, a method to homogeneously apply TPBD to the surface of carbon fiber reinforced plastics (CFRP) was developed using cellulose nanofiber (CNF) and aqueous electrodeposition solution containing a polymer with epoxy group. The heat-storable CFRP was obtained, the maximum exoergic and endoergic heats of 30 J/g were confirmed, and its tensile strength was approximately 61% of CFRP without TPBD/CNF.

An efficient manufacturing method for I-shaped cross-sectional CFRP beam with arbitrary arrangement of carbon fiber using electro-activated resin molding
Kazuaki Katagiri, Shinya Honda, Sayaka Minami, Daiki Kimu, Shimpei Yamaguchi, Takuya Ehiro, Ozaki Tomoatsu, Hirosuke Sonomura, Sonomi Kawakita, Mamoru Takemura, Yayoi Yoshioka, Katsuhiko Sasaki
Mechanics of Advanced Materials and Structures, 27, 18, 1541, 1550, 15 Sep. 2020, [Peer-reviewed]
English, Scientific journal, © 2018, © 2018 Taylor & Francis Group, LLC. The I-shaped cross-sectional beam of CFRP (CFRP I-beam) is usually manufactured by the continuous protrusion method. Carbon fibers can only be arranged in the longitudinal direction. The CFRP I-beam with arbitrary arrangement of carbon fiber was manufactured with applying the electro-activated deposition molding method. The carbon fiber fabric was immersed in the deposition solution and energized, epoxy resin precipitated around carbon fiber and impregnated. The resin-impregnated fabric was installed to the mold, and the CFRP I-beam was fabricated. The CFRP I-beam was subjected to three-point bending tests, and the relationship between load-deflection was simulated by finite-element analysis.

Vibration optimization of laminated composite plates using genetic algorithm with various discrete fiber angles
M. Innami, Y. Narita, K. Sasaki, S. Honda
IOP Conference Series: Earth and Environmental Science, 419, 1, 08 Feb. 2020
International conference proceedings, The mechanical characteristics of a laminated plate can be tailored by adjusting the fiber orientation angle of each orthotropic lamina. To find the fiber orientation angle of each lamina that maximizes the fundamental frequency, previous works analyses using various optimization algorithms have been performed so far. However, the solution space becomes significantly larger as the number of combinations in orientation angles increases. Thus the optimization process takes much more time. This paper sets up the orientation angles to discrete design variables, such as 15?, 30?, etc. Genetic algorithm is employed to find the optimal solutions. The CFRP rectangular composite plates with 8, 12 and 16 layers are considered as an example using the Ritz method for finding the eigenvalues. Two sets of classical boundary conditions are used as edge conditions. It was revealed that the fundamental frequency makes about 5% difference from the optimal value if it is in 30° steps and about 24% in 90° steps.

Estimation and Optimization of Vibration Damping Characteristics for Composites Fabricated by Electrodeposition Resin Molding Method
TAKISAWA Hiraku, Honda Shinya, KATAGIRI Kazuaki, SASAKI Katsuhiko, TAKEDA Ryo
The Proceedings of the Dynamics & Design Conference, 2020, 105, 105, The Japan Society of Mechanical Engineers, 2020
Japanese,

Our previous research found that CFRPs fabricated by the electrodeposition resin molding (ERM) method exhibited high damping properties. In this research, tailored fiber placement (TFP) was used to make curved fiber shapes, however, those shapes were limited to a parabola and a sine curve. Linear combination of radial basis functions (RBFs) were used to make more complex fiber shapes, and optimum fiber shapes are investigated to improve damping of CFRPs fabricated by the ERM method. Damping is modeled by the specific damping capacity (SDC) which is defined as the ratio of dissipated energy and maximum strain energy, and total damping properties of CFRPs are calculated using finite element analysis (FEA). Before optimization, material SDCs of a plain weave sheet and a TFP layer, which are compositions of CFRPs, are identified by particle swarm optimization (PSO) using the results of experimental modal analysis and FEA. Then, fiber shapes were optimized to maximize the first modal SDC of L-shaped and T-shaped plates using PSO with nonlinear dissipative term. Simultaneously, the thickness distribution which is caused by overlaps or gaps between curved fibers was estimated and applied to a finite element model for more accurate numerical estimation. The results showed that the present optimization of curved fiber shapes including estimation of thickness distribution improves the first modal SDC and decreases the volume of a TFP layer in comparison with unidirectional fiber shapes.

Fabrication of the twist morphing wing for the UAV by CFRP with applying the electrodeposition resin molding method
Kazuaki Katagiri, Shimpei Yamaguchi, Sonomi Kawakita, Shinya Honda, Katsuhiko Sasaki, Nozomu Kogiso, Masato Tamayama
AIAA Scitech 2020 Forum, 1 PartF, 2020
International conference proceedings, © 2020, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. The fixed-wing UAV is recently increasing for various missions. For an efficient flight of the UAV, a morphing wing is expected. In this study, the twist morphing wing that deforms entire surface was focused. The twist morphing wing using the Z-shaped cross-sectional spar (Z-spar) was designed and fabricated by CFRP with applying the electrodeposition resin molding (ERM) method. The ERM method, which was developed by the authors, is suitable for the integral molding of three-dimensional structure of CFRP since the resin is impregnated between carbon fibers in the electrodeposition solution. The frontward structure of the morphing wing consisting of the leading edge and Z-spar could be integrally molded by ERM method. Also, for the backward of the wing, CFRP thin plates fabricated by ERM method were installed for upper and lower surface. The plates next to each other were partially overlapped with imitating the bird's feathers. Additionally, the twist morphing wing was installed to the UAV and the aerodynamic performances were evaluated by the wind tunnel test. As a result, the effect of the morphing on the aerodynamic performances was confirmed.

Fabrication of heat-storable CFRP by incorporating trans-1,4-polybutadiene with the application of the electrodeposition resin molding method
Kazuaki Katagiri, Ryohei Gotoh, Tsuyoshi Totani, Takuya Isono, Shimpei Yamaguchi, Takuya Ehiro, Hirosuke Sonomura, Tomoatsu Ozaki, Sonomi Kawakita, Yayoi Yoshioka, Sayaka Minami, Shinya Honda, Katsuhiko Sasaki
Journal of Energy Storage, 26, Dec. 2019, [Peer-reviewed]
English, Scientific journal, © 2019 Elsevier Ltd This work presents a method to fabricate the heat-storable CFRP, a multifunctional composite that combines strength, lightweight and heat storability. For mobile electric devices, thermal management system using phase change material (PCM) has been developed. However, as long as the PCM changes to liquid phase, it is difficult to reduce the weight since the sealed container is indispensable. Hence, the authors have focused trans-1,4-polybutadiene (TPBD), which is crystalline polymer that accumulates heat by crystal structure transition in solid phase. In this study, TPBD was incorporated into CFRP. To avoid exposing TPBD to high-temperature and high-pressure processes, the electrodeposition resin molding (ERM) method was applied. That is, a non-crimp carbon fiber fabric (NCF) was immersed in the electrodeposition solution containing epoxy polymers in which the pulverized TPBD was dispersed. Applying a current, resin was deposited and impregnated between carbon fibers. Simultaneously, TPBD was incorporated to obtain heat-storable CFRP.

Enhancement of the mechanical properties of the CFRP by cellulose nanofiber sheets using the electro-activated deposition resin molding method
Kazuaki Katagiri, Shinya Honda, Sayaka Minami, Shimpei Yamaguchi, Sonomi Kawakita, Hirosuke Sonomura, Tomoatsu Ozaki, Sohei Uchida, Masayuki Nedu, Yayoi Yoshioka, Katsuhiko Sasaki
Composites Part A: Applied Science and Manufacturing, 123, 320, 326, Aug. 2019, [Peer-reviewed]
English, Scientific journal, © 2019 Elsevier Ltd Cellulose nanofibers (CNFs) have high strength. Therefore, many studies have been conducted to improve the mechanical properties of carbon fiber reinforced plastics (CFRP) by dispersing CNF in the matrix. However, since CNFs are hydrophilic, a hydrophobic treatment is required. Previously, authors showed the bending strength of CFRP could be enhanced by CNFs without a hydrophobic treatment. Applying the electro-activated deposition resin molding (ERM) method to fabricate CFRP, CNFs can be applied on the surface since the electro-activated deposition solution is essentially water-based and contains a polymer with epoxy groups. In this study, the CNF sheet was prepared by drying CNF dispersion in advance. Shortly after the ERM, the CNF sheet was applied to the surface of the CFRP. The mechanical properties of the CFRP were enhanced, the maximum elastic modulus and tensile strength were 2.3 times and 1.7 times of the CFRP specimen without the CNF sheet, respectively.

Process monitoring of deep drawing using machine learning
Tomohiro Tsuruya, Musashi Danseko, Katsuhiko Sasaki, Shinya Honda, Ryo Takeda
IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM, 2019-, 1227, 1232, Institute of Electrical and Electronics Engineers Inc., 01 Jul. 2019
English, International conference proceedings, This study proposes a new processing method by using the count rate of the acoustic emission (AE) signal and machine learning. To analyze the AE count, machine learning, using a multilayered neural networks, is implemented for a deep drawing process. In a press processing, a quality inspection is often carried out for each lot in a later process. Once a failure occurs in the process, a large number of defective products may be produced due to the fast processing speed. In order to prevent this, it is important to immediately stop the processing just after the defect occurs. The AE signal data has been often used for monitoring the condition of process. However, it is easily affected by noise and lacks repeatability. Also it is difficult to handle the number of AE data due to its high frequencies of target signals. Therefore, the improvement of the data processing method and recognition rate is required and thus the machine learning approach is applied in this study.

Optimum design of Composite Materials
Shinya HONDA
日本航空宇宙学会誌, 76, 5, 161, 166, May 2019, [Peer-reviewed], [Invited]
Japanese, Scientific journal

Multi-objective Optimization of Variable-stiffness Composites Fabricated by Tailored Fiber Placement Machine　　　　　　　　　　　　　　　
Shinya HONDA
EPI International Journal of Engineering, 2, 1, 14, 18, Feb. 2019, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Enhancement of mechanical properties of CFRP manufactured by using electro-activated deposition resin molding method with the application of CNF without hydrophobic treatment
Kazuaki Katagiri, Katsuhiko Sasaki, Shinya Honda, Sayaka Minami, Shimpei Yamaguchi, Takuya Ehiro, Tomoatsu Ozaki, Hirosuke Sonomura, Sonomi Kawakita, Sohei Uchida, Masayuki Nezu, Yayoi Yoshioka
Composites Science and Technology, 169, 5, 203, 208, 05 Jan. 2019, [Peer-reviewed]
English, Scientific journal, © 2018 Elsevier Ltd Cellulose nanofiber (CNF) is high strength and lightweight, additionally, it is produced by sustainable natural resources such as wood. Therefore, it has been reported the mechanical properties of CFRP can be improved by dispersing CNF in the matrix. However, as CNF is hydrophilic, a hydrophobic treatment was applied in many previous studies. For efficient CFRP manufacturing, the authors have developed an electrochemical resin molding method by using aqueous electro-activated deposition which contains the polymer having an epoxy group. In this method, the carbon fiber fabric is immersed in the electro-activated deposition solution and energized, epoxy resin is precipitated around the carbon fiber and impregnated. In this study, shortly after electro-activated deposition, CNF without a hydrophobic treatment was applied to the surface of the resin-impregnated carbon fiber fabric. The mechanical properties of CFRP could be enhanced, and optimum weight fraction of CNF was revealed.

CFRP manufacturing method by using electro-activated deposition and the effect of reinforcement with carbon fiber circumferentially around the hole
Kazuaki Katagiri, Shinya Honda, Sayaka Minami, Yusuke Tomizawa, Daiki Kimu, Shimpei Yamaguchi, Takuya Ehiro, Tomoatsu Ozaki, Hirosuke Sonomura, Sonomi Kawakita, Mamoru Takemura, Yayoi Yoshioka, Katsuhiko Sasaki
COMPOSITE STRUCTURES, 207, 658, 664, ELSEVIER SCI LTD, Jan. 2019, [Peer-reviewed]
English, Scientific journal, For the efficient manufacturing of carbon fiber reinforced plastics (CFRP), the electro-activated deposition resin molding (ERM) method is developed. The carbon fiber fabric is immersed in an electro-activated deposition solution containing polymer with epoxy groups. By energization, an epoxy resin is precipitated on the surface of the carbon fiber, and impregnation occurred in the solution. In this study, applying the ERM method, CFRP specimen with the hole was manufactured. Furthermore, the reinforcement by arranging the fiber circumferentially around the hole was installed. The carbon fiber fabric was sewn using the tailored fiber placement (TFP) machine. As a results, the effect of the reinforcement was confirmed. The tensile strength of CFRP with the hole and the reinforcement was the same as in the case without the hole. From the finite element analysis, it was confirmed that the reinforcement around the hole reduced the stress concentration.

Vibration characteristic of weight saving boom sprayer by using CFRP
Satoru TAMAKI, Shinya HONDA, Yohei HOSHINO, Katsuhiko SASAKI, Ryo TAKEDA
The Proceedings of the Dynamics & Design Conference, 2019, 102, 102, Japan Society of Mechanical Engineers, 2019
Scientific journal

Strength properties of CFRP reinforced by cellulose nanofiber sheets between prepregs
KATAGIRI Kazuaki, YAMAGUCHI Shimpei, KAWAKITA Sonomi, OKUMURA Toshihiko, HONDA Shinya, SASAKI Katsuhiko, KUME Kazuhiro
The Proceedings of the Materials and Mechanics Conference, 2019, 0, OS2103, The Japan Society of Mechanical Engineers, 2019, [Peer-reviewed]
Japanese,

Carbon fiber reinforced plastics (CFRPs) have the properties of high strength and lightweight, and it has been applied for aircrafts or automobiles. Recently, cellulose nanofibers (CNFs) have been found to be superior in strength, thus, researches are being conducted to enhance the strength of CFRP by applying CNF. However, since CNF is hydrophilic, a hydrophobic treatment is inevitable. Previously, authors have reported that the electrodeposition resin molding method to manufacture CFRPs using the electrodeposition solution (EDS) containing a polymer with epoxy group, and the strength enhancement by CNFs could be possible. In this study, to improve the strength of CFRP conventionally manufactured by prepregs, a method was developed to disperse CNFs between prepregs using EDS. Carrying out the three-point bending test, the effects of the dispersed CNF on the bending stiffness and strength were clarified. As a result, the bending stiffness per weight (specific bending stiffness) increased in proportion to the weight fraction of CNF, and was approximately 2.9 times that of the CFRP specimen without CNF when the CNF weight fraction was 17 %. In the same manner, the bending strength per weight (specific bending strength) was approximately 1.6 times that of the CFRP specimen without CNF when the CNF weight fraction was 22 %.

Vibration characteristics of CFRP fabricated by electro-activated deposition molding method
HASHIMOTO Naoki, HONDA Sinya, KATAGIRI Kazuaki, SASAKI Katsuhiko, TAKEDA Ryo, YAMAGUCHI Shimpei, KAWAKITA Sonomi
The Proceedings of the Dynamics & Design Conference, 2019, 0, 103, 103, The Japan Society of Mechanical Engineers, 2019, [Peer-reviewed]
Japanese, Research society,

An autoclave molding with prepregs is the most general method of CFRP manufacturing. It is well known that this method is time and energy consuming and prevents the cost reduction of CFRPs. Therefore, aiming to improve CFRP productivity, some manufacturing methods without the autoclave have been proposed such as a vacuumed resin transfer molding（VaRTM）method. The authors have been also proposed a new CFRP manufacturing method that is an electro deposition resin molding（EDRM）method. The EDRM is an application of the electro deposition technology which has been used as a coating technology for automobiles, and it is suitable for mass productions. In our previous studies, static mechanical properties including stiffnesses and strength of CFRPs molded by the EDRM have been investigated, but their dynamic properties have not been done yet. Therefore, in this study, in order to evaluate the vibration characteristics of CFRPs produced by the EDRM, an experimental modal analysis and finite element analysis（FEA） were performed on CFRP specimens with straight and curved reinforcing fibers. The specimens were also manufactured by the VaRTM method and their vibration damping characteristics were compared. It was confirmed from numerical and experimental results that natural frequencies and eigenmode shapes agree well with high accuracy, and the FEA is useful for the specimen manufactured by the EDRM. It is also found that CFRPs produced by the EDRM has greater modal damping ratios than CFRPs by the VaRTM.

The bending properties of CFRP I-shaped cross-sectional beam with dispersing cellulose nanofibers on the surface
Kazuaki Katagiri, Shinya Honda, Daiki Kimu, Shimpei Yamaguchi, Tomoatsu Ozaki, Hirosuke Sonomura, Sonomi Kawakita, Sohei Uchida, Masayuki Nezu, Mamoru Takemura, Yayoi Yoshioka, Katsuhiko Sasaki
Proceedings of the American Society for Composites - 34th Technical Conference, ASC 2019, 2019, [Peer-reviewed]
International conference proceedings, © 2019 by DEStech Publications, Inc. and American Society for Composites. All rights reserved. The strength enhancement of the matrix of CFRP has been a major research subject. In particular, strength of the surface resin layer of CFRP is quite important since the bending stress is most effective on the surface but also exposed to foreign object debris (FOD). One of the methods to strengthen resin matrix of CFRP is to disperse cellulose nanofibers (CNF), therefore, many studies have been conducted. However, due to hydrophilicity of CNF, a hydrophobic treatment is indispensable. Although various hydrophobic methods have been proposed, special chemical substances are required and resulted in higher manufacturing costs. In previous study, authors showed that the mechanical properties of CFRP were enhanced by CNF without hydrophobic treatment using the electro-activated deposition resin molding (ERM) method. In the ERM method, a non-crimp carbon fiber fabric (NCF) is immersed in the electro-activated deposition solution which contains polymer with epoxy group. Then, by energization, the resin precipitates around the carbon fiber and is efficiently impregnated to the NCF in the solution. After the ERM, CNF can be applied on the surface of CFRP since the electro-activated deposition solution is water-based. After thermal curing, CNF is embedded on the surface resin layer of CFRP. In this study, the analysis to understand the effect of CNF on the mechanical properties was carried out. As a practical application, the I-shaped cross-sectional beam (I-beam) was selected for the analysis. It was experimentally revealed that the bending strength of I-beam was enhanced by embedding of CNF. With assumed the material constants based on the tensile tests of the CFRP, the bending properties with dispersing CNF on the surface were analyzed by using the finite element method. As a result, the relationship between load and deflection could be well simulated, and the effect of CNF on the bending properties was clarified.

Forming state recognition in deep drawing process with machine learning　　　　　　　　　　　　　　　
Tomohiro TSURUYA, Musashi DANSEKO, Katsuhiko SASAKI, Shinya HONDA, Ryo TAKEDA
Journal of Advanced Mechanical Design, Systems, and Manufacturing (Manufacturing System), 13, 3, 2019, [Peer-reviewed]
English, Scientific journal

Optimum design of lay‐up configuration and ply drop‐off placement for tapered composite laminate　　　　　　　　　　　　　　　
Shinya Honda, Kosuke Takahashi, Tetsuya Higuchi, Ryotaro Takeuchi
Proceedings of ASC 33rd Annual Technical Conference/18th US-Japan Conference on Composite Materials, #89, Sep. 2018, [Peer-reviewed]
English, International conference proceedings

Identification of elastic edge condition for modeling vibration response of glass touch panel
Yoshihiko Kaito, Shinya Honda, Yoshihiro Narita
JVC/Journal of Vibration and Control, 24, 18, 4081, 4095, SAGE Publications Inc., 01 Sep. 2018
English, Scientific journal, This paper deals with the vibration modeling of a glass panel, with emphasis on smartphone applications, and attempts to identify the elastic boundary condition to support the glass panel. This study is motivated to develop a more-efficient vibration function of the glass panel in smartphones. First, based on the classical plate theory, the vibration behavior is analyzed with consideration of the elastic translational and rotational springs distributed along the panel edge. The accuracy of applying the energy method (Ritz method) is verified by comparing the analytical results with the experimental results by a modal analysis technique, and it is shown that the plate theory used for crystalline materials (i.e. metals and plastics) is applicable also to the glass (non-crystalline) plates. Second, the elastic constants of such distributed springs are identified by a combination of the genetic algorithm and the present Ritz method, and the design approach is summarized for developing more effective use of the vibrating function on glass panels in the smartphones and other tablet terminals.

Minimum Weight Design of Composite Panel under Aeroelastic Constraint　　　　　　　　　　　　　　　
Shinya Honda, Gaku Yokoyama
EPI International Journal of Engineering, 1, 1, 7, 12, Feb. 2018, [Peer-reviewed]
English, Scientific journal

Efficient manufacturing method of CFRP corrugation by using electro-Activated deposition resin molding
Kazuaki Katagiri, Shinya Honda, Shimpei Yamaguchi, Takuya Ehiro, Sonomi Kawakita, Hirosuke Sonomura, Tomaotsu Ozaki, Tayoi Yoshioka, Mamoru Takemura, Sayaka Minami, Katsuhiko Sasaki
33rd Technical Conference of the American Society for Composites 2018, 5, 2819, 2831, 2018, [Peer-reviewed]
English, International conference proceedings, © 2018 33rd Technical Conference of the American Society for Composites 2018. All rights reserved. CFRP corrugation structures are used for various purposes, and application to morphing wing has recently been drawing attention. However, an effective manufacturing method for the CFRP corrugation has not established. Vacuum-Assisted resin transfer molding (VARTM) method can decrease manufacturing cost, but it cannot be applied for corrugation since vacuum bagging is impossible. Therefore, the conventional method to laminate prepreg and consolidate by using autoclave has been applied. In this study, by using electro-Activated deposition resin molding, it was confirmed that CFRP corrugation structures could be easily manufactured. Neither autoclave nor vacuum bagging was necessary. The corrugation and corrugated core sandwiches with different pitches were fabricated and mechanical properties were investigated.

The effect of curvilinear carbon fiber arrangement on the mechanical properties of CFRP manufactured by electro-activated deposition molding
KATAGIRI Kazuaki, KAWAKITA Sonomi, KIMURA Takahiro, TAKEMURA Mamoru, YOSHIOKA Yayoi, SASAKI Katsuhiko, HONDA Shinya, MINAMI Sayaka, KIM Daiki, YAMAGUCHI Shimpei, EHIRO Takuya, SONOMURA Hirosuke, OZAKI Tomoatsu
The Proceedings of Mechanical Engineering Congress, Japan, 2018, 0, J0430303, The Japan Society of Mechanical Engineers, 2018, [Peer-reviewed]
Japanese,

For an efficient manufacturing method of CFRP, the electro-activated deposition molding method was developed. In this method, the carbon fiber fabric with curvilinear carbon fiber arrangement could be easily manufactured. The arbitrary arrangement of carbon fiber fabric can be woven by using embroidery machine, and was immersed in an electrodeposition solution containing an epoxy group and energized. Resin could be impregnated, after heat curing, CFRP was obtained. Impregnation is occurred in liquid, therefore, pressurizing process can be eliminated. So, autoclave became unnecessary, neither vacuum packing nor vacuum resin injection like VARTM (Vacuum assisted Resin Molding) method was required. In this study, tensile strength tests were conducted on the three kinds of CFRP specimens, with straight carbon fiber without hole, with hole in the center of specimen, and with controlling carbon fiber direction along principle stress. As a result, the maximum stress of the specimen with hole decreased to 82% of without hole. In case of the specimen with controlling carbon fiber direction along principle stress, the maximum stress recovered to 91% of without hole.

Improvement of impact strength of CFRP by using cellulose nano fiber without hydrophobic treatment
KATAGIRI Kazuaki, SASAKI Katsuhiko, KUME Kazuhiro, YAMAGUCHI Shimpei, EHIRO Takuya, SONOMURA Hirosuke, OZAKI Tomoatsu, HASEGAWA Yasunori, OKUMURA Toshihiko, MINAMI Sayaka, HONDA Shiya
The Proceedings of the Materials and Mechanics Conference, 2018, 0, OS0712, The Japan Society of Mechanical Engineers, 2018, [Peer-reviewed]
Japanese,

Carbon fiber reinforced plastics (CFRP) has high strength and light weight properties. However, for impact load, an improvement has been required since resin matrix is weak. For CFRP manufacturing, the authors have developed the electro-activated deposition resin molding (EDRM) method to impregnate the resin, and the strength of CFRP for the static load was increased by the application of CNF without hydrophobic treatment. In this study, applying EDRM method, the impact strength of CFRP was improved by using cellulose nanofiber (CNF) without hydrophobic treatment. The electro-activated deposition solution contains polymer with epoxy group. The method was to apply the mixture of CNF dispersion and electro-activated deposition solution to the prepreg. After thermal curing, the CFRP which has CNF layer on the surface was obtained. The three-point bending test was carried out to confirm the static strength, and the impact strength was also confirmed by the Charpy impact testing.

Resin molding by using electro-activated deposition for efficient manufacturing of carbon fiber reinforced plastic
Kazuaki Katagiri, Katsuhiko Sasaki, Shinya Honda, Hikaru Nakashima, Yusuke Tomizawa, Shimpei Yamaguchi, Tomoatsu Ozaki, Hirosuke Sonomura, Atsushi Kakitsuji
COMPOSITE STRUCTURES, 182, 15, 666, 673, ELSEVIER SCI LTD, Dec. 2017, [Peer-reviewed]
English, Scientific journal, A more efficient manufacturing process for CFRP is expected to save energy, time and cost for production. However, it is difficult to impregnate the resin efficiently and uniformly between the carbon fibers, micro void tend to remains and strength decreases. In this study, a novel manufacturing method of CFRP by using the electro-activated deposition resin molding was developed. The non-crimp carbon fiber fabric was immersed in the electro-activated deposition solution, that containing epoxy groups. And, the fabric was energized and heat cured. The electro-activated deposition conditions and tensile properties were investigated for the CFRPs. It was confirmed that resin could be impregnated for multiple plies of the non-crimp carbon fiber fabric without using autoclave and injecting viscous resin like VARTM. Comparing to the traditional manufacturing process, a step of previously mixing an epoxy resin prepolymer and a curing agent was not required. And, a process of vacuum suction could be eliminated, so, wrapping non-crimp carbon fiber fabric with vacuum bag was not necessary.

CFRP manufacturing method using electrodeposition resin molding for curvilinear fiber arrangements
Kazuaki Katagiri, Katsuhiko Sasaki, Shinya Honda, Hikaru Nakashima, Shimpei Yamaguchi, Tomoatsu Ozaki, Hirosuke Sonomura, Atsushi Kakitsuji
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 102, 108, 116, ELSEVIER SCI LTD, Nov. 2017, [Peer-reviewed]
English, Scientific journal, Recently, theoretical and experimental methods were proposed for organizing carbon fibers in straight and curvilinear arrangements to obtain a uniform stress distribution in the design of three-dimensional (3D) carbon fiber reinforced thermosetting plastic (CFRP). In this study, to establish an efficient CFRP manufacturing method and realize the curvilinear arrangement of carbon fibers, we develop an electrodeposition resin molding technique. That is, immersing a noncrimp fabric in the electrodeposition solution and energizing electricity, the fabric is impregnated by the resin; thus, a CFRP with curvilinear carbon fibers can be efficiently produced without autoclaving and vacuum packing. We then confirm the optimal electrodeposition conditions for maximizing the tensile strength of the CFRP, and obtain the 3D shape of the CFRP by keeping the noncrimp fabric in solution along the mold. (C) 2017 Elsevier Ltd. All rights reserved.

Identification of Elastic Edge Condition for Modelling Vibration Response of Glass Touch Panel　　　　　　　　　　　　　　　
Yoshihiko Kaito, Shiya HONDA, Yoshhiro Narita
Journal of Vibration Control, 102, 108, 116, Nov. 2017, [Peer-reviewed]
English, Scientific journal

Effect of adding cellulose nanofibers to CFRP manufactured by using electrodeposition
KATAGIRI Kazuaki, YOSHIOKA Yayoi, KAKITSUJI Atsushi, SASAKI Katsuhiko, HONDA Shinya, TOMIZAWA Yusuke, MINAMI Sayaka, YAMAGUCHI Shimpei, EHIRO Takuya, OZAKI Tomoatsu, SONOMURA Hirosuke
The Proceedings of the Materials and Mechanics Conference, 2017, 0, OS1023, The Japan Society of Mechanical Engineers, 2017, [Peer-reviewed]
Japanese,

High strength properties of cellulose nanofiber (CNF) are well known, and it has also been already reported that the strength of CFRP could be improved by dispersing CNF in the matrix resin. However, in the previous work, hydrophobic treatment was required to disperse CNF due to its hydrophilicity. In this study, based on a novel manufacturing method of CFRP by using electro-activated deposition resin molding, CNF without hydrophobic treatment was well dispersed on the surface of CFRP. The process was, firstly, the non-crimp carbon fiber fabric was immersed in an electro-activated deposition solution which includes epoxy groups. And, the fabric was electrically energized and electrodepositioned. Secondly, the CNF dispersion was applied and coated to the surface of CFRP. The electrodeposition solution used in this method is an environmentally friendly aqueous solvent. CNF has good dispersibility in water, hydrophobic treatment was not necessary. After heat curing, the three-point bending test was conducted to confirm the strength properties. As a result, it was found that the flexural modulus was improved by 49% and the bending strength was improved by 41%, comparing to the CFRP without CNF on the surface.

Vibration analysis and optimization of sandwich composite with curvilinear fibers
S. Honda, Y. Narita
Journal of Physics: Conference Series, 744, 1, Institute of Physics Publishing, 03 Oct. 2016, [Peer-reviewed]
English, International conference proceedings, The present paper develops a shell element based on the refined zigzag theory (RZT) and applies it to the vibration analysis and optimization problem of the composite sandwich plate composed of CFRP skins and soft-cores. The RZT accepts large differences in layer stiffness, and requires less calculation effort than the layer-wise or three-dimensional theories. Numerical results revealed that the present method predicts vibration characteristics of composite sandwich plates with soft-core accurately. Then, shapes of reinforcing fibers in CFRP composite skins are optimized to maximize fundamental frequencies. As an optimizer, the particle swarm optimization (PSO) approach is employed since curvilinear fiber shapes are defined by continuous design variables. Obtained results showed that the composite sandwich with optimum curvilinear fiber shapes indicates higher fundamental frequencies compared with straight fibers.

Fabrication of Thermoplastic Composite by Tailored Fiber Placement Machine
MIYAJIMA Wataru, MURAKAMI Daichi, HONDA Shinya, NARITA Yoshihiro
The Proceedings of Conference of Hokkaido Branch, 2016, 83, 84, The Japan Society of Mechanical Engineers, 2016
Japanese

Vibration characteristics and optimization for panel elastically supported in mobile phone　　　　　　　　　　　　　　　
Yohihiko Kaito, Shinya Honda, Yoshihiro Narita
Journal of Physics: Conference Series, 744, 1, 2016, [Peer-reviewed]
English, International conference proceedings

Multi-objective optimization for vibration suppression of smart laminated composites　　　　　　　　　　　　　　　
Shinya Honda, Yoshihiro Narita, Itsuro Kajiwara
Mechanical Engineering Journal, Special Issue on Systems Design for Motion and Vibration Control (MEJ:DR), 2, 1, DOI: 10.1299/mej.14-00561, Jan. 2016, [Peer-reviewed], [Lead author]
English, Scientific journal

Vibration optimization of composite sandwich plate with soft core by using refined zigzag theory　　　　　　　　　　　　　　　
S. Honda, T. Kumagai, Y. Narita
Proceedings of the 16th Asian Pacific Vibration Conference (APVC2015), USB, Nov. 2015, [Peer-reviewed], [Lead author]
English, International conference proceedings

Multi-objective optimization for snap-through deformation of bi-stable composite shell　　　　　　　　　　　　　　　
Honda Shinya, Keisuke Takahashi, Narita Yoshihiro
Transactions of the JSME, 81, 824, 1, 15, Apr. 2015, [Peer-reviewed], [Lead author]
Japanese, Scientific journal

Adaptive Control for Vibration Suppression by Using Self-organization Map
Shinya Honda, Yoshihiro Narita, Naohiro Kida
2015 10TH ASIAN CONTROL CONFERENCE (ASCC), USB, IEEE, 2015, [Peer-reviewed], [Lead author]
English, International conference proceedings, An adaptive control method using a self-organizing map (SOM) which is a kind of neural networks is proposed to suppress vibration of smart structures. The SOM learns characteristics of given data without supervising and categorizes high dimensional data into low dimensional maps with keeping complex relationships among data. The present method employs the SOM to estimate states of the controlled object and makes a lookup table of control input. Each node of the state estimation SOM consists of vectors including controlled responses and control input. The SOM and lookup table learn and are updated only when the effective control input is applied to the controlled object where the evaluation function of control system is defined by differences between the desired state and current state. The present method just requires information about the control response and input, resulting in implementation of the vibration control without numerical models for controlled object. Numerical and experimental results are given for the smart structure fabricated by an aluminum plate and piezoelectric actuators, assuming as an unknown object. Both numerical and experimental results successfully demonstrate effectiveness of the present method.

2201 Design of Composite Structures by Using Taguchi Method
TANAKA Soichiro, HONDA Shinya, NARITA Yoshihiro
Proceedings of the Optimization Symposium, 2014, _2201, 1_-_2201-6_, The Japan Society of Mechanical Engineers, 2014
Japanese, The carbon fiber reinforced plastics have been widely used to manufacture the precise structure, such as antenna reflectors, due to their lightweight and high dimensional stability as compared to the metallic materials. When one uses CFRP laminates to antenna reflectors for space telescopes, thermal deformation invokes a serious problem. This deformation can be suppressed if the laminates are stacked symmetrically. It is known, however, that CFRP laminates show unpredictable deformation caused by the ply angle misalignments. Since the ply misalignment is unavoidable, it is important to choose the lay-ups that mitigate the misalignment effects. In this study, the lay-ups and supporting positions are optimized in robust sense by using Taguchi method (TM). Although it is not possible to take into account the effect of interactions between parameters. This is because TM decreases the optimization accuracy in some cases. Therefore, Taguchi method with statistical modeling (TM/S) which considers the interaction effects by using statistical estimated model is proposed. Finally, the performance of TM and TM/S are compared each other.

1216 Multi-objective optimization for vibration suppression of smart laminated composites
Honda Shinya, Watanabe Kazuki, Narita Yoshihiro
Proceedings of the Optimization Symposium, 2014, _1216, 1_-_1216-5_, The Japan Society of Mechanical Engineers, 2014
Japanese, The present paper proposes a multi-objective optimization technique for smart laminated composites to maximize two conflicting objectives. The first objective is the performance of active vibration control of smart composite with piezoelectric (PZT) actuators. The second is the fundamental frequency of smart structures related to the performance of passive vibration control. Both performances of active and passive vibration control are maximized simultaneously. The vibration suppression of smart structures strongly depends on both actuator placements and vibration mode shapes. It is possible to design vibration mode shapes for laminated fibrous composites since their anisotropy for whole thickness is tailorable by arranging fiber orientation angle in each layer. This allows the smart structure with laminated composite to archive higher performance of vibration suppression than those with isotropic materials. However, the optimized structure results in lower natural frequencies than composites with typical fiber orientation angles since an effective input of control force from actuators is realized for the structure with lower stiffness. This reveals that there is a trade-off relation for smart composite structures between the performance of active vibration suppression and natural frequencies. To disclose this relation, the present study applies the effective multi-objective optimization technique, the refined non-dominated genetic algorithm (NSGAII), and obtains Pareto optimal solutions. Calculated results are successfully validated by a comparison with those from the real-tune control experiment where a laser excitation technique which is effective to small sized structures is used.

2202 Benchmark Test Function Considering the Properties of the Lay-up Optimization
HAYASHI Toshiya, HONDA Shinya, NARITA Yoshihiro
Proceedings of the Optimization Symposium, 2014, _2202, 1_-_2202-6_, The Japan Society of Mechanical Engineers, 2014
Japanese, The advantage of the carbon fiber reinforced plastics (CFRP) is tailoring capability for their mechanical properties by changing the lay-up designs. Recently, meta-heuristic methods (e.g., a genetic algorithm (GA) and a particle swarm optimization (PSO)) have been often employed in such lay-up design problems. In addition to the proper choice among meta-heuristic methods, there are some parameters to be decided carefully to achieve good performance in optimization. In practical problems involving heavy computation costs, however, it is difficult to judge which method is appropriate to a given specific problem and what values are reasonable for the accompanying parameters. In this study, a new benchmark function is proposed to simulate global behaviors of the lay-up design problem and to give criterion for proper choice of the parameters in GA, PSO and the layerwise optimization (LO) methods. In numerical results, performances of the three methods are compared and the proposed benchmark function is shown to be quite effective in simulating the lay-up optimization problem.

Analysis and Lay-up Optimization for Vibration of Laminated Plates with Complex Shape and Edge Conditions
Yoshihiro Narita, Shinya Honda, Kosuke Owatari
INTERNATIONAL CONFERENCE ON MECHANICS AND MATERIALS ENGINEERING (ICMME 2014), 436, 442, DESTECH PUBLICATIONS, INC, 2014, [Peer-reviewed]
English, International conference proceedings, The finite element formulation and lay-up optimization method are combined to solve the optimum lay-up design problem of laminated composite plates with complex geometry and boundary conditions. Based on the first-order shear deformation theory (FSDT), the eight-node quadrilateral isoparametric element is developed, and a layerwise optimization (LO) approach is implemented to the combination with this finite element. In numerical examples, the fundamental frequencies of symmetrically laminated composite plates are maximized with respect to fiber orientation angles in the layers. Six numerical models are presented for square plates with various boundary conditions, and the same models are extended to trapezoidal plate geometry with different aspect ratios. The wide applicability and solution accuracy are demonstrated in the numerical results for the maximized fundamental frequencies and the best fiber orientation angles.

Optimum Design and Experimental Evaluation for Smart Micro-composites by Using Laser Excitation Technique　　　　　　　　　　　　　　　
Shinya HONDA, Kazuki WATANABE, Yoshihiro NARITA, Itsuro KAJIWARA
Proceedings of the 9th International Symposium on Vibrations of Continuous Systems (ISVCS9), 28, 30, Jul. 2013, [Peer-reviewed]
English, International conference proceedings

Analysis and Lay-up Optimization for Vibration of Laminated Composite Plate with Rigid Body Attachments　　　　　　　　　　　　　　　
Yoshihiro NARITA, Shinya HONDA, Takahiro FUNAMIZU
Proceedings of the 9th International Symposium on Vibrations of Continuous Systems (ISVCS9), 55, 57, Jul. 2013, [Peer-reviewed]
English, International conference proceedings

Vibration Suppression of Automobile Composite Panels　　　　　　　　　　　　　　　
Yoshihiro NARITA, Daisuke NARITA, Shinya HONDA
Proceedings of the 15th Asia Pacific Vibration Conference, W2_302_1, USB, Jun. 2013, [Peer-reviewed]
English, International conference proceedings

Vibration Analysis for Thermally Induced Bi-stable Composite Shallow Shell　　　　　　　　　　　　　　　
Keisuke TAKAHASHI, Shinya HONDA, Yoshihiro NARITA
Proceedings of the 15th Asia Pacific Vibration Conference, T1_301A_1, Jun. 2013, [Peer-reviewed]
English, International conference proceedings

Vibration Optimization of Fibrous Composite Reinforced by Curvilinear Fibers　　　　　　　　　　　　　　　
Ryo Tsubata, Shinya HONDA, Yoshihiro NARITA
Proceedings of 15th Asia Pacific Vibration Conference (APVC-15), M3_303B_2, USB, Jun. 2013, [Peer-reviewed]
English, International conference proceedings

Maximization of Vibration Control Performance for Micro Smart Composites with the Laser Excitation Technique　　　　　　　　　　　　　　　
Kazuki WATANABE, Shinya HONDA, Yoshihiro NARITA, Itsuro KAJIWARA
Proceedings of the 15th Asia Pacific Vibration Conference, M1_303B_1, USB, Jun. 2013, [Peer-reviewed]
English, International conference proceedings

Multi-objective optimization of curvilinear fiber shapes for laminated composite plates by using NSGA-II
Shinya Honda, Teruki Igarashi, Yoshihiro Narita
Composites Part B: Engineering, 45, 1, 1071, 1078, Feb. 2013, [Peer-reviewed]
English, Scientific journal, A multi-objective optimization approach for fibrous composite plates with curvilinear fibers is proposed in the present study. The non-dominated sorting genetic algorithm (NSGA-II) is used to obtain Pareto-optimum solutions, where the presence of a trade-off relation between the mechanical performance and curvatures of reinforcing fibers has been established. The in-plane strength around a circular hole in a finite-width plate with Tsai-Wu failure criteria or the fundamental frequency of the square plate is the mechanical objective function, while the average value of fiber curvatures is used as the conflicting objective function. Numerical results were obtained for angle-ply plates and the effectiveness of the present design approach is demonstrated by widely distributed Pareto-optimum solutions. © 2012 Elsevier Ltd. All rights reserved.

Frequency maximization of laminated sandwich plates under general boundary conditions using layerwise optimization method with refined zigzag theory
Shinya Honda, Takahito Kumagai, Kazuya Tomihashi, Yoshihiro Narita
Journal of Sound and Vibration, 332, 24, 6451, 6462, 2013, [Peer-reviewed]
English, Scientific journal, The present paper extends the layerwise optimization (LO) procedure to the maximization problem of the fundamental frequencies of sandwich plates with fibrous composites and low stiffness core layers. Frequencies are calculated by the Ritz method based on a refined zigzag theory (RZT). Polynomial functions which satisfy at least geometrical boundary conditions with boundary indexes are employed as displacement functions, and they enable satisfying arbitrary sets of boundary conditions for rectangular plates. Results of the experimental modal analysis validate the accuracy of the present calculations, and a comparison with results of the classical laminated theory (CLPT) and the first order share deformation theory (FSDT) supports the effectiveness of the present method. Optimized results are compared with other typical sets of lay-up configurations and this shows the LO method as suitable means to the optimization problem for sandwich plates. © 2013 Elsevier Ltd.

Experimental Modal Analysis of Passive Constrained Layer Damping Plate Using CFRP Material　　　　　　　　　　　　　　　
Kazuya TOMIHASHI, Shinya HONDA, Yoshihiro NARITA
Proceedings of 8th Asian-Australasian Conference on Composite Materials (ACCM-8), CD-ROM, Nov. 2012, [Peer-reviewed]
English, International conference proceedings

Multidisciplinary Design Optimization of Smart Composite Shell for Vibration Suppression　　　　　　　　　　　　　　　
Kou KOSAKA, Shinya HONDA, Yoshihiro NARITA
Proceedings of 8th Asian-Australasian Conference on Composite Materials (ACCM-8), CD-ROM, O-SMA-093, Nov. 2012, [Peer-reviewed]
English, International conference proceedings

Multi-objective Optimization of Fibrous Composites with Curvilinear Fibers for Mechanical Properties and Fiber Geometries　　　　　　　　　　　　　　　
Teruki IGARASHI, Shinya HONDA, Yoshihiro NARITA
Proceedings of 8th Asian-Australasian Conference on Composite Materials (ACCM-8), CD-ROM, O-DES-142, Nov. 2012, [Peer-reviewed]
English, International conference proceedings

Static and Vibration Optimization of Composite Structures with 3-D Local Anisotropy　　　　　　　　　　　　　　　
Yuta ISHIBASHI, Shinya HONDA, Yoshihiro NARITA
Proceedings of 8th Asian-Australasian Conference on Composite Materials (ACCM-8), CD-ROM, O-DES-094, Nov. 2012, [Peer-reviewed]
English, International conference proceedings

Vibration Characteristics of Bi-stable Asymmetrically Laminated Composite Shell　　　　　　　　　　　　　　　
Keisuke TAKAHASHI, Shinya HONDA, Yoshihiro NARITA
Proceedings of 8th Asian-Australasian Conference on Composite Materials (ACCM-8), CD-ROM, O-DES-092, Nov. 2012, [Peer-reviewed]
International conference proceedings

Vibration Optimization of Laminated Composite Rectangular Plates with General Elastic Edge Restraints　　　　　　　　　　　　　　　
Yoshihiro NARITA, Shinya HONDA
Proceedings of the US-Japan conference of Composite Materals ASTM-D30 Meeting, 284, 295, Oct. 2012, [Peer-reviewed]
English, International conference proceedings

VIBRATION ANALYSIS OF LAMINATED VGCF/ALUMINUM CIRCULAR PLATES WITH EXPERIMENTAL VERIFICATION　　　　　　　　　　　　　　　
Yoshihiro NARITA, Shinya HONDA, Naoaki KOYA
Proceedings of the International Conference on Mechanics of Nano, Micro and Macro Composite Structures, CD-ROM, No.427, Jun. 2012, [Peer-reviewed]
English, Scientific journal

Multidisciplinary design optimization for smart micro-composite and experimental validation by using laser excitation technique
Shinya Honda, Kazuki Watanabe, Yoshihiro Narita, Itsuro Kajiwara
ASME 2012 5th Annual Dynamic Systems and Control Conference Joint with the JSME 2012 11th Motion and Vibration Conference, DSCC 2012-MOVIC 2012, 3, 339, 347, 2012, [Peer-reviewed]
English, International conference proceedings, The present paper proposes a multidisciplinary design optimization method for smart micro-composite structures to maximize vibration suppression performance, and an innovative experimental technique with laser excitation is applied to validate numerical results. The smart structures are composed of graphite/epoxy (CFRP) composites and PZT actuators. The performance of smart structures for vibration suppression strongly depends on vibration mode shapes and PZT actuator placements. It is possible to specify vibration mode shapes for the laminated composite by varying the stacking angles of reinforcing fibers, and both fiber orientation angles and PZT placements are optimized simultaneously by using a simple Genetic Algorithm (GA) method. Then, the calculated results are validated by an experiment using laser excitation which excites the micro-sized structures with high reproducibility since the laser is precisely irradiated to the structure at same position with same power repeatedly. Copyright © 2012 by ASME.

Natural frequencies and vibration modes of laminated composite plates reinforced with arbitrary curvilinear fiber shape paths
Shinya Honda, Yoshihiro Narita
JOURNAL OF SOUND AND VIBRATION, 331, 1, 180, 191, ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, Jan. 2012, [Peer-reviewed]
English, Scientific journal, The development of tow-placement technology has made it possible to control fiber tows individually and place fibers in curvilinear distinct paths in each layer of a laminated plate. This paper presents an analytical method for determining natural frequencies and vibration modes of laminated plates having such curvilinear reinforcing fibers. Spline functions are employed to represent arbitrarily shaped fibers, and Ritz solutions are used to derive frequency equations using series type shape functions. The strain energy is evaluated by numerical integration involving the fiber orientation angle, and is calculated using the derivative of the spline function in minute intervals. The results show that the natural frequencies obtained by the present method agree well with results from finite element analyses. The vibration mode shape contour plots of the plates are seen to reflect clear influences of the fiber shapes. (C) 2011 Elsevier Ltd. All rights reserved.

Vibration analysis of laminated composite plates under centrifugal forces
Masaaki Wada, Shinya Honda, Yoshihiro Narita
Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 78, 789, 1586, 1595, 2012, [Peer-reviewed]
Japanese, International conference proceedings, Since composite materials are known to have high specific stiffness and strength, they have been widely used in many industrial fields, including windmill turbine blades. Such light-weight composite structures under body forces are required to study their vibration characteristics to prevent fatigue failure and noise. In this report, the effect of centrifugal forces is studied on natural frequencies of laminated composite plates as such a model of blade. The stress distribution of plates under centrifugal forces is first solved by the Ritz method, and the natural frequencies under in-plane stresses are calculated in the Ritz method by using in-plane stress distributions determined in the first problem. The numerical results obtained by the present method are compared with those from FEM. It is found that both result for the plate with various aspect ratios agree well and this validates the present calculation method. As an application of the present method, lay-up configurations of composite laminated plates are optimized for maximizing frequencies of arbitrary modes under centrifugal forces by a layerwise optimization (LO) method. The optimum lay-up configuration determined by the LO method with the present model results in higher natural frequencies than plates with typical lay-up configurations. ©2012 The Japan Society of Mechanical Engineers.

1106 Multidisciplinary design optimization of micro-smart composites for vibration control performance and experimental validation by a laser excitation technique
WATANABE Kazuki, HONDA Shinya, NARITA Yoshihiro, KAJIWARA Itsuro
Proceedings of the Optimization Symposium, 2012, _1106, 1_-_1106-5_, The Japan Society of Mechanical Engineers, 2012
Japanese, The present paper proposes a multidisciplinary design optimization method for smart micro-composite structures to maximize vibration suppression performance, and an innovative experimental technique with laser excitation is applied to validate numerical results. The smart structures are composed of graphite/epoxy (CFRP) composites and PZT actuators. The performance of smart structures for vibration suppression strongly depends on vibration mode shapes and PZT actuator placements. It is possible to specify vibration mode shapes for the laminated composite by varying the stacking angles of reinforcing fibers, and both fiber orientation angles and PZT placements are optimized simultaneously by using a simple Genetic Algorithm (GA) method. Then, the calculated results are validated by an experiment using laser excitation which excites the micro-sized structures with high reproducibility since the laser is precisely irradiated to the structure at same position with same power repeatedly.

Multidisciplinary Design Optimization for Vibration Control of Smart Laminated Composite Structures
Shinya Honda, Itsuro Kajiwara, Yoshihiro Narita
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES, 22, 13, 1419, 1430, SAGE PUBLICATIONS LTD, Sep. 2011, [Peer-reviewed]
English, Scientific journal, The structure and vibration control system of smart laminated composites consisting of graphite-epoxy composites and piezoelectric actuators are designed for optimum vibration suppression. The placement of piezoelectric actuators, the lay-up configurations of laminated composite plates, and the H(2) control system are employed as design variables and they are optimized simultaneously by a simple genetic algorithm. To reduce complexity, only pre-selected families of lay-up configurations are considered. An objective function is the H(2) performance with respect to the controlled response for vibration suppression. A multidisciplinary design optimization is performed with the above three design variables and then the output feedback system is reconstructed with a dynamic compensator based on a linear matrix inequality approach. The validity of the modeling and calculation technique is confirmed experimentally. Optimization results show that optimized smart composites with the present approach successfully realize vibration suppression and it is confirmed that the proposed multidisciplinary design optimization technique enhances the vibration suppression of smart composites.

Design of smart composite for vibration suppression using lamination parameters
Honda S, Kosaka K, Narita Y, Kajiwara I
Proceedings of ICCM International Conferences on Composite Materials, IF0541, Aug. 2011, [Peer-reviewed]
English, International conference proceedings

Multidisciplinary Design Optimization of Surface Shapes and Lay-Up Configurations for Laminated Composite Shells
HONDA Shinya, KATO Takeru, NARITA Yoshihiro, NARITA Daisuke
J Syst Des Dyn (Web), 5, 8, 1662, 1673, The Japan Society of Mechanical Engineers, 2011, [Peer-reviewed]
English, Shapes and lay-up configurations of laminated composite shallow shells are optimized simultaneously to maximize the fundamental frequency by a simple genetic algorithm method. The surface shape is defined by a cubic polynomial and this makes it possible to express a variety of surfaces with inconstant curvature radii by varying the values of the coefficients for each polynomial term. The coefficients and the lay-up configurations of the laminated shells are directly employed as design variables, and constraints are imposed on the coefficients and curvature radii to maintain the shallowness of the shells. The frequencies are calculated by using the Ritz method due to its flexibility with surface shapes. The results of the present analysis agreed well with experimental and finite element analysis results in terms of frequencies and mode shapes. The obtained optimum solutions resulted in higher fundamental frequencies than for shells with commonly emplyed surface shapes and lay-up configurations.

Vibration design of laminated fibrous composite plates with local anisotropy induced by short fibers and curvilinear fibers
Shinya Honda, Yoshihiro Narita
COMPOSITE STRUCTURES, 93, 2, 902, 910, ELSEVIER SCI LTD, Jan. 2011, [Peer-reviewed]
English, Scientific journal, The present paper studies an optimum design method for proposing new types of fiber reinforced composite plates with locally anisotropic structure A finite element program is developed to analyze vibration of such locally anisotropic plates and the fundamental frequency is taken as an object function to be maximized First, for demonstrating the effectiveness of local anisotropy the optimum distributions of short fibers are calculated without directional constraints using a simple genetic algorithm (GA) and the layerwise optimization (LO) concept is used to reduce the computation time in the finite element calculation Secondly optimum arrangements of continuous curvilinear fibers are obtained under the continuity constraints where fiber directions are considered as projections of contour lines of a cubic polynomial surface Numerical results show that the local anisotropy successfully improves frequency property and the optimum directions of short fibers indicate physically reasonable orientations Also the plates with optimally shaped continuous fibers yield higher fundamental frequencies than the conventional plates with parallel fibers (C) 2010 Elsevier Ltd All rights reserved

Multidisciplinary Design Optimization of Surface Shapes and Lay-Up Configurations for Composite Laminated Shells
HONDA Shinya, KATO Takeru, NARITA Yoshihiro, NARITA Daisuke
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C, 77, 777, 1793, 1802, 一般社団法人 日本機械学会, 2011, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, Shapes and lay-up configurations of composite laminated shallow shells are optimized simultaneously to maximize the fundamental frequency by a simple genetic algorithm method. The shell shape is defined by a cubic polynomial and this makes it possible to express various shapes of shells with inconstant curvature radii by varying the value of coefficient for each term. The coefficients and the lay-up configuration of the laminated shell are directly employed as design variables, and constraints are imposed on the coefficients and curvature radii to keep shells shallow. The frequencies are ca...

The Effect of Internal Line Supports on Optimum Lay-up Design for Vibration of Laminated Rectangular Plates
Yoshihiro Narita, Shinya Honda
DYNAMICS FOR SUSTAINABLE ENGINEERING, VOL 2, 987, 995, HONG KONG POLYTECHNIC UNIV, 2011, [Peer-reviewed]
English, International conference proceedings, The layerwise optimization (LO) approach is extended to the vibration optimization of laminated rectangular plates with internal line supports. The plates considered rest on some elastic or rigid line supports distributed in different arrangements. The LO approach provides a simple design procedure for composite structural optimization which may be used to maximize the fundamental frequencies of the plates. The design variables are taken for a set of fiber orientation angles in the symmetric layers. The vibration problem is solved by the Ritz method with consideration of strain energy stored in the elastic supports. In numerical results, symmetrically laminated plates with different sets of line support locations are considered and the validity of the optimum results is established by comparisons with those of plates with typical lay-ups.

Vibration Testing Method of Smart Micro-Composite with Laser Excitation
Shinya Honda, Yoshihiro Narita, Itsuro Kajiwara, Satoshi Nakamura
DYNAMICS FOR SUSTAINABLE ENGINEERING, 2011, VOL 3, 1462, 1470, HONG KONG POLYTECHNIC UNIV, 2011, [Peer-reviewed]
English, International conference proceedings, A vibration testing method for a micro-sized smart composite device using a noncontact excitation technology of the laser ablation is presented in this study. A smart structure consists of graphite/epoxy composites and piezoelectric actuators. There is a difficulty in exciting micro-devices experimentally by an impulse hammer or external exciter due to limitations on size and their high natural frequencies, resulting in an ineffective vibration evaluation. The laser ablation technology with pulse laser makes it possible to excite the structure without making a physical contact with devices and it generates a sharper impulse force than the physical contact. The experimental results showed that the present technique excites smart micro-composite accurately ranging to the high frequency region with high reproducibility and the smart micro-composite indicates specified performance of vibration control. This reveals that the laser ablation technique is suitable for the testing method of smart micro-composites.

Multi-objective optimum design of composite structures by using the design of experiments
Yasuyuki Joko, Shinya Honda, Yoshihiro Narita
Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 76, 765, 1062, 1067, Japan Society of Mechanical Engineers, 2010, [Domestic magazines]
Japanese, Scientific journal, The fiber reinforced plastics are widely used in engineering structures because they have excellent features of high specific strength and stiffness ratio. These advanced composites are fabricated typically by stacking orthotropic layers, each of which is composed of reinforcing fibers and matrix material. In this work, an optimum design approach is proposed to deal with multiobjective design for buckling behaviors of laminated composite plates. The approach consists of two parts : the first part is to calculate the influence factors and determine the estimated model of each objective function by using design of experiments, and the second part is to explore Pareto sets from the estimated model. In numerical examples, the fiber orientation angles of symmetrically laminated plate are optimized for maximizing the buckling parameters simultaneously for two different compression loadings. It is shown that the proposed approach is quite effective in obtaining Pareto sets with reduced calculation cost. Moreover, the influence analysis found that outer layers are more effective than the inner layers, and the interactions between adjacent layers are also important on buckling behavior of the laminated plates.

Analytical and experimental study for vibration of laminated VGCF/Al circular plates　　　　　　　　　　　　　　　
Naoaki Koya, Shinya Honda, Katsuhiko Sasaki, Yoshihiro Narita
7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010, 1, 721, 724, ACCM-7 Organizing Committee, 2010
English, International conference proceedings, An analysis method is presented for vibration of laminated composite circular plates composed of vapor growth carbon fiber (VGCF) and aluminum. Based on the classical laminated plate theory, the Ritz method is applied to the problem, and a frequency equation is derived by minimizing the total potential energy with respect to unknown coefficients of the displacement function. Various kinds of boundary conditions are incorporated by using boundary indexes. The natural frequencies calculated by the method show good agreement with the results from the finite element analysis and the experimental modal analysis.

Analysis, experiment and cost design for vibration of hybrid laminated plates　　　　　　　　　　　　　　　
Takashi Koshiba, Shinya Honda, Yoshihiro Narita
7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010, 2, 827, 830, ACCM-7 Organizing Committee, 2010
English, International conference proceedings, The vibration characteristics of hybrid laminated plates with various thicknesses of core materials under various boundary edge conditions are investigated. The hybrid plates composed of aluminum (Al) core and carbon fiber reinforced plastics (CFRP) outer-layers are used for mechanical structures due to low costs and attractive mechanical properties. Especially for the out-of-plane problem, outer layers have greater influences to bending stiffness than inner layers and CFRP/Al hybrid laminated plates have advantages. In this work, an optimization method is presented to maximize fundamental frequencies of CFRP/Al hybrid laminated plates by designing lay-up configurations of CFRP layers. As an optimizer, a layerwise optimization (LO) method which is based on a simple physical observation is employed. In the bending problem, the outer region of cross-section of plate is more sensitive to bending stiffnesses of plates and fiber orientation angles can be determined sequentially from the outermost to the innermost layer. The Ritz solution is used to derive frequency equations. The present work deals with CFRP/Al hybrid plates with relatively high thicknesses and the first-order shear deformation theory is applied to formulate vibration problems. Referring to the numerical results, test specimens are made by hand lay-up methods, and natural frequencies and modal shapes are measured by experimental modal analysis with impulse hammer. From comparison of both results, the validity of the present methods is successfully confirmed and optimization results for various thicknesses of core materials enable cost design of CFRP/Al hybrid laminated plates.

Vibration optimization of laminated parallelogram plates with experimental verification　　　　　　　　　　　　　　　
Toshinori Fujii, Shinya Honda, Yoshihiro Narita
7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010, 1, 773, 776, ACCM-7 Organizing Committee, 2010
English, International conference proceedings, In this study, the fiber orientation angles of laminated parallelogram plates are optimized to maximize fundamental frequencies. A layerwise optimization (LO) approach is employed as an optimizer. The LO approach is based on a simple physical fact, and it can reduce computational efforts and make the optimization insensitive to increase of number of layers. For calculations of natural frequencies, the Ritz method using the first-order shear deformation theory (FSDT) is applied. The Ritz method is not flexible with respect to plate shapes but it has advantages over the finite element method (FEM) in calculation time and parametric studies. An accuracy of the present analysis is confirmed by comparing the present results with those from FEM, and for validation of the optimization results, the present results are compared also with experimental results. Test specimens are made by a hand lay-up method to refer to the optimization results, and the frequency responses and modal shapes are measured by an experimental modal analysis with impulse tests. Both sets of results agree well in terms of frequencies and modal shapes, and it is thus revealed that the LO approach is applicable in efficient way to the parallelogram plates.

Optimization of fibrous composite plates for in-plane strength using curvilinear fibers　　　　　　　　　　　　　　　
Shinya Honda, Kosuke Owatari, Yoshihiro Narita
7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010, 1, 769, 772, ACCM-7 Organizing Committee, 2010
English, International conference proceedings, Locally anisotropic structures induced by curvilinear fibers are designed optimally to improve in-plane strength of fibrous composites. Objectives of the present optimizations are maximizing in-plane strength of the fibrous composite plates with circular holes. As the strength indexes, Tsai-Wu failure model is employed here. Curvilinear fiber shapes are described by the projections of contour lines for a cubic-polynomial surface. Various surfaces are described by varying coefficients of the polynomial and they are used as design variables in the present optimization. Originally developed finite element analysis (FEA) code is used to analyze stress distributions, and a simple genetic algorithm (SGA) method is employed as an optimizer. The numerical results show that the present plates with curvilinearly shaped fibers give lower failure indexes than conventional plates reinforced by parallel fibers.

Buckling analysis for laminated composite plates reinforced by curvilinear fibers
Shinya Honda, Yoshimasa Oonishi, Yoshihiro Narita
Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 76, 765, 1056, 1061, Japan Society of Mechanical Engineers, 2010, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, This paper proposes an analytical method for elastic buckling of laminated composite plates with local anisotropy induced by curved reinforcement fibers. The local anisotropy accounts for nonhomogenous stress distribution within the plate when it is subjected to in-plane loads along the boundary. An in-plane elasticity problem has to be solved first to determine the in-plane stresses, and these stresses become input to the buckling problem. Both in-plane and buckling problems are solved independently by using the Ritz method with algebraic polynomial displacement functions. In numerical results, the present results agree well with those from the finite element method, and the present plates with specific curvilinear fibers show higher buckling loads than plates with conventional straight fibers. It is therefore confirmed that the locally anisotropic plates with curvilinear fibers have strong possibility to improve the buckling performance over conventional materials with straight fibers.

Minimization of stress concentration for laminated composite plates with curvilinearly shaped fibers
Shinya Honda, Kosuke Owatari, Yoshihiro Narita
Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, 76, 769, 1139, 1146, Japan Society of Mechanical Engineers, 2010, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, The equivalent stress concentration of laminated composite plates reinforced by curvilinear fibers is minimized with respect to fiber geometries under uniaxial tensile load. Projection of contour lines in cubic-polynomial is used to represent curvilinear geometry of fibers, and this description makes it possible to tolerate multi-valued function without solving simultaneous equations, typically seen in the process of using the spline function. The finite element method is employed with the eight-node quadrilateral isoparametric element for stress concentration analysis. In this FEM procedure, curvilinear fibers are approximated by assuming straight short fibers in each element. The optimum curvilinear fiber shapes are searched for minimizing the equivalent stress concentration using a simple genetic algorithm, and the coefficients of terms in cubic polynomial are used as design variables. In numerical examples, single-layer and angle-ply laminated composite plates are considered for different aspect ratios of circular holes. The optimized results show that the present plates with optimally shaped curvilinear fibers can make the equivalent stress concentration lower than those of the conventional plates with optimally oriented parallel fibers.

LAYERWISE OPTIMIZATION FOR VIBRATION OF AUTOMOBILE COMPOSITE PANELS
Yoshihiro Narita, Shinya Honda, Claire Couppie
PROCEEDINGS OF THE 17TH INTERNATIONAL CONGRESS ON SOUND AND VIBRATION, INT INST ACOUSTICS & VIBRATION, 2010, [Peer-reviewed]
English, International conference proceedings, As the composite materials technology develops gradually, these materials tend to be more intensively applied in engineering structures. For instance, in the sportive automobiles, the composite materials replace conventional materials resulting in the significant reduction of structural weight, and thus it increases the overall performance of automobiles. Such automobile structural components are known to be exposed to vibration excitation in use. In particular, resonance phenomenon may cause disturbing effects such as noise and fatigue, and hence the need for a vibration response study is obvious. One measurement for such vibration problem is to avoid resonance by maximizing the fundamental frequency. Therefore, by making use of advantages in a fiber reinforced laminated composite, it is attempted to optimize the material by adjusting the fiber orientation angle in each layer. Although consideration of the best fiber orientation simultaneously in all layers leads to a great calculation time, it is shown that the layerwise optimization scheme reduces such time.

MULTIDISCIPLINARY DESIGN OPTIMIZATION OF ACTUATOR ARRANGEMENTS, LAY-UP CONFIGURATIONS AND CONTROL SYSTEMS FOR SMART LAMINATED COMPOSITE STRUCTURES
Shinya Honda, Itsuro Kajiwara, Yoshihiro Narita
PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE STRUCTURES AND INTELLIGENT SYSTEMS, 2010, VOL 2, 3661, 315, 321, AMER SOC MECHANICAL ENGINEERS, 2010, [Peer-reviewed]
English, International conference proceedings, Structures and control systems of smart laminated composites consisting of graphite-epoxy composites and piezoelectric actuators are designed optimally for the vibration suppression. Placements of piezoelectric actuators, lay-up configurations of laminated composite plates and the H-2 control system are employed as design variables and are optimized simultaneously by a simple genetic algorithm (SGA). An objective function is H-2 performance with assuming that the state feedback is available. A multidisciplinary design optimization is performed with above three design variables and then the output feedback system is reconstructed with the dynamic compensator based on the linear matrix inequality (LMI) approach. Optimization results show that the optimized smart composite successfully realizes vibration suppression of the system and it is confirmed that the present multidisciplinary design optimization technique is quite efficient to the smart composites.

Maximizing the Fundamental Frequency of Laminated Composite Plates with Optimally Shaped Curvilinear Fibers
HONDA Shinya, NARITA Yoshihiro, SASAKI Katsuhiko
J Syst Des Dyn (Web), 3, 6, 867, 876, The Japan Society of Mechanical Engineers, 2009, [Peer-reviewed]
English, A new design method is proposed here to maximize the fundamental frequency of laminated composite plates reinforced by curvilinear fibers. Spline functions represent arbitrarily shaped fibers and the Ritz method generates frequency equations. The optimum curvilinear shapes are searched for the maximum fundamental frequencies using a genetic algorithm, and increments of data points which define the spline shape are used as design variables under the limited range of undulation. Comparison of the present analysis method gives good agreement with the finite element method in terms of natural frequencies and vibration modes, and the optimized results show that the present plate with optimally shaped curvilinear fibers gives higher or equal fundamental frequencies than those of conventional plates with optimally oriented parallel fibers.

Discrete Optimization for Vibration Design of Composite Plates by Using Lamination Parameters
Shinya Honda, Yoshihiro Narita, Katsuhiko Sasaki
ADVANCED COMPOSITE MATERIALS, 18, 4, 297, 314, VSP BV, 2009, [Peer-reviewed]
English, Scientific journal, A design method is proposed to optimize the stacking sequence of laminated composite plates for desired vibration characteristics. The objective functions are the natural frequencies of the laminated plates, and three types of optimization problems are studied where the fundamental frequency and the difference of two adjacent frequencies are maximized, and the difference between the target and actual frequencies is minimized. The design variables are a set of discrete values of fiber orientation angles with prescribed increment in the layers of the plates. The four lamination parameters are used to describe the bending property of a symmetrically laminated plate, and are optimized by a gradient method in the first stage. A new technique is introduced in the second stage to convert from the optimum four lamination parameters into the stacking sequence that is composed of the optimum fiber orientation angles of all the layers. Plates are divided into sub-domains composed of the small number of layers and designed sequentially from outer domains. For each domain, the optimum angles are determined by minimizing the errors between the optimum lamination parameters obtained in the first step and the parameters for all possible discrete stacking sequence designs. It is shown in numerical examples that this design method can provide with accurate optimum solutions for the stacking sequence of vibrating composite plates with various boundary conditions. (C) Koninklijke Brill NV, Leiden, 2009

Maximizing the fundamental frequency of laminated composite plates with optimally shaped curvilinear fibers
Shinya Honda, Yoshihiro Narita, Katsuhiko Sasaki
Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 75, 753, 1244, 1250, Japan Society of Mechanical Engineers, 2009, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, A new design method is proposed here to maximize the fundamental frequency of laminated composite plates reinforced by curvilinear fibers. Spline functions represent arbitrarily shaped fibers and Ritz solutions generate frequency equations. The optimum curvilinear shapes are searched for the maximum fundamental frequencies using genetic algorithms, and the increments of data points which define the spline shape are used as design variables under the limited range of undulation. Comparison of the present analysis method gives good agreement with the finite element method in terms of natural frequencies and vibration modes, and the optimized results show that the present plate with optimally shaped curvilinear fibers gives higher or equal fundamental frequencies than those of the conventional plate with optimally oriented parallel fibers.

J0405-1-6 Vibration and Buckling Analysis for Composite Shell Structures Reinforced by Curvilinear Fibers
HONDA Shinya, OONISHI Yoshimasa, NARITA Yoshihiro
The proceedings of the JSME annual meeting, 2009, 371, 372, The Japan Society of Mechanical Engineers, 2009
Japanese, Many natural materials, such as bones and trees, indicate non-homogenous anisotropy, and have higher performance than the homogenous one. To exploit those properties for design of artificial engineering structures, laminated composite shells reinforced by curvilinear fibers are analyzed to reveal their vibration and buckling properties. They have local anisotropy due to curved fibers, and show different properties from homogenous one. Projections of contour lines for cubic polynomial surfaces to the horizontal plane represent curvilinear fibers. This make is possible to represent multi-valued function and have large degree of freedom. The natural frequencies and critical buckling loads are calculated by using FEM, where the element coordinate system is translated to the tangential direction of the contour lines in the element centroids at each element. The results are given for a cylindrical shell and a shell with non-uniform curvature. It turns out that the curvilinear fibers have strong possibility to improve vibration and buckling performance of composite shell structures.

Layerwise Optimization of Laminated Comoposite Structures by Using a General-Purpose FEM Software
HONDA Shinya, ANDKJAER Jacob A, NARITA Yoshihiro
Transactions of the Japan Society of Mechanical Engineers. C, 74, 743, 1926, 1927, 一般社団法人日本機械学会, Jul. 2008, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, The lay-up optimization problem of laminated composite structures is solved by using a general-purpose finite element method software ANSYS to confirm the availability of the layerwise optimization (LO) method. In the LO method that the authors proposed, all layers are assumed first to have zero stiffness but mass and then one dimensional search is applied in each layer starting from the outermost layer to the innermost layer sequentially. After the first cycle solution is found for all the layers, the process is repeated with keeping the angles found in the previous process till the lay-up...

Identification of Boundary Conditions in Shallow Shells by Using Frequency Data
HONDA Shinya, BERGER Stefan, NARITA Yoshihiro
Transactions of the Japan Society of Mechanical Engineers. C, 74, 742, 1676, 1677, 一般社団法人日本機械学会, Jun. 2008, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, A technique is proposed for identifying both in-plane and out-of-plane boundary conditions of laminated composite, thin shallow shells of rectangular planform. The values of natural frequencies are generally governed by the aspect ratio, curvature ratios and material constants that are measurable relatively easily, but it is very difficult to estimate accurately the boundary conditions that imply the degree of constraints along the edges. Particularly, unlike flat plates, the in-plane and out-of-plane displacements are coupled in the shell, and this increases significantly the number of pos...

Design for the Maximum Natural Frequency of Laminated Composite Plates by Optimally Distributed Short Fibers(D & D 2007)
HONDA Shinya, NARITA Yoshihiro
Transactions of the Japan Society of Mechanical Engineers. C, 74, 741, 1049, 1055, 一般社団法人日本機械学会, May 2008, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, A new design method of functional fiber reinforced plastics (FRP) which imitate micro structures of natural materials such as bones and shells is proposed in this work. The material has local anisotropy induced by optimally distributed short fibers which are defined in each element of the finite element method. To design such locally anisotropic thin plates, the present optimum design method combines a genetic algorithm method (GA) with layerwise optimization (LO) concept. The LO concept reduces multi-layer optimization into iterations of single-layer optimizations and the GA is used for a ...

Buckling analysis of composite rectangular plates reinforced by curvilinear fibers　　　　　　　　　　　　　　　
Yoshimasa Oonishi, Shinya Honda, Yoshihiro Narita, Katsuhiko Sasaki
Progress of Composites 2008 in Asia and Australasia - Proceedings of the 6th Asian-Australasian Conference on Composite Materials, ACCM 2008, 315, 318, 2008
English, International conference proceedings, A composite plate reinforced by curvilinear fibers presents non-homogenous properties in the region of the plate and has locally anisotropic property due to curvilinear fibers. If fiber shapes are designed optimally, the local anisotropy may be distributed in the appropriate region where it is needed. This suggests that the plate with curvilinear fibers has great design flexibility and strong possibility to sophisticate plate properties. Thus, the present study proposes a buckling analysis method of the plate with curvilinear fibers. Although in-plane stresses before buckling behavior indicate non-homogenous distribution caused by curvilinear fibers, the stress distribution is approximated as homogenous state in this study. The validity of this approximation is verified by a comparison between the present results and those by the finite element method. It is clarified in numerical comparisons that there exist a range of applicability where such approximation is available and the stress distribution is not significant.

Vibration analysis of laminated composite plates reinforced by arbitrarily shaped curvilinear fibers　　　　　　　　　　　　　　　
Shinya Honda, Yoshimasa Oonishi, Yoshihiro Narita, Katsuhiko Sasaki
Progress of Composites 2008 in Asia and Australasia - Proceedings of the 6th Asian-Australasian Conference on Composite Materials, ACCM 2008, 347, 350, 2008
English, International conference proceedings, The development of tow-placement technology has made it possible to control fiber tows individually and place fibers with curvilinear shapes along distinct paths in each layer of a laminated plate. The variation of fiber direction within the plane gives the locally anisotropic property, and this kind of plate property offers the potential of great design flexibility in comparison with conventional plates with homogenous properties. Hence, this paper proposes an analytical method for analyzing the natural frequencies and vibration modes of laminated plates with curvilinearly shaped reinforcing fibers. Spline functions are employed to represent arbitrarily shaped fibers, and Ritz solutions are used to derive frequency equations. The strain energy is obtained by numerical integration involving the fiber orientation angle, and is calculated by using the derivative of the spline function in minute intervals. The results show that the natural frequencies of the present plate agree well with the results from the finite element method and the vibration modes of the present plates reflect clear influences of the fiber shapes.

Vibration analysis of fibrous composite plates reinforced along arbitrary curvilinear fiber shapes　　　　　　　　　　　　　　　
Shinya Honda, Yoshimasa Oonishi, Yoshihiro Narita, Katsuhiko Sasaki
15th International Congress on Sound and Vibration 2008, ICSV 2008, 2, 1514, 1521, 2008
English, International conference proceedings, The development on tow-placement technology made us possible to control fiber tows individually and place fiber paths in each layer of a laminated plate with curvilinear shapes. Due to the variation of fiber direction within the plane, the plate has variable-stiffnesses or locally anisotropic properties, and such plates create a lot of flexibility for designing and different features when they are compared with conventional plates with homogenous properties. The designing flexibility suggests the possibility to sophisticate the plate property better. Hence, an analytical method for natural frequencies and vibration modes of the laminated plate with curvilinearly shaped reinforcing fibers are proposed in this study. Spline functions are employed to represent arbitrarily shaped fibers and the Ritz solutions which allow the arbitrary sets of boundary conditions of rectangular plates are used to derive frequency equations. In numerical results, the natural frequencies of the present plate agree well with those of approximated finite element plate model, and the vibration modes of the present plates clarifies distinct influences of the fiber shapes.

汎用FEMの援用による複合耕料構造の層別最適化
本田 真也
日本機械学会論文集C編(NOTE) 第74巻第743号, 1926, 1927, 2008, [Peer-reviewed]
Scientific journal

Design for the Maximum Natural Frequency of Laminated Composite Plates by Optimally Distributed Short Fibers
HONDA Shinya, NARITA Yoshihiro
J Syst Des Dyn (Web), 2, 6, 1195, 1205, The Japan Society of Mechanical Engineers, 2008, [Peer-reviewed]
English, A new design method is proposed for vibration of functional fibrous composite plates, which imitate micro structures of natural materials such as bones and shells. The material has local anisotropy induced by optimally distributed short fibers which are defined in each element of the finite element method. To design such locally anisotropic plates, the present optimum design method combines a genetic algorithm method (GA) with a layerwise optimization (LO) concept. The LO concept reduces a multi-layer optimization into iterations of a single-layer optimization, and the GA is used for the single-layer optimization to determine fiber orientation angles in each element. The fundamental frequency of the plates is chosen as the objective function to be maximized. It was revealed that the present plates give higher fundamental frequencies than conventional plates reinforced by parallel straight fibers. Further optimally distributed short fibers indicated specific orientations even though no constraint was imposed on those directions.

Vibration Analysis of Composite Rectangular Plates Reinforced along Curved Lines
HONDA Shinya, OONISHI Yoshimasa, NARITA Yoshihiro, SASAKI Katsuhiko
J Syst Des Dyn (Web), 2, 1, 76, 86, The Japan Society of Mechanical Engineers, 2008, [Peer-reviewed]
English, In the past few decades, composite materials composed of straight fibers and polymer matrix have gained their status as the most promising material for light-weight structures. Technical merit of the composites as tailored material also provided practical advantages in the optimum design process. Recently, it is reported that the fabrication machine has been developed to make curved fibers embedded in the matrix material. Based on such technical advancement, this paper proposes an analytical method to study vibration of composite rectangular plates reinforced along curved lines. The approach is based on the Ritz method where variable fiber direction can be accommodated. For this purpose, the fibers continuously changing their direction are formulated as the variable bending stiffness in the total potential energy. A frequency equation is derived by the Ritz minimizing process, and frequency parameters are calculated as the eigenvlaues in the eigenvalue problem. In numerical results, the accuracy of the method is presented by comparing present results with FEM results. The advantages of present plate are confirmed by comparing natural frequencies and mode shapes with those of conventional composite and isotropic plates, and the effectiveness of the new solution to the most recent problem is demonstrated.

Optimization for the maximum buckling loads of laminated composite plates - Comparison of various design methods
Shinya Honda, Yoshihiro Narita, Katsuhiko Sasaki
ADVANCES IN COMPOSITE MATERIALS AND STRUCTURES, PTS 1 AND 2, 334-335, 89, +, TRANS TECH PUBLICATIONS LTD, 2007, [Peer-reviewed]
English, International conference proceedings, Structural plate elements in composite structures are typically fabricated by stacking orthotropic layers, each of which is composed of reinforcing fibers and matrix materials. In this work, three optimum design approaches are compared to clarify the advantages and disadvantages for optimizing the buckling performance of laminated composite plates. The first approach is developed recently by the authors, where the buckling load is maximized with respect to the lamination parameters by a gradient method and then the optimum lay-up design is determined by minimizing the errors between the optimum parameters and parameters for all possible discrete lay-ups. The second approach is the layerwise optimization (LO) approach where the fiber orientation angle in each layer is optimized step-by-step by repeating one dimensional search. The third one is a direct application of a simple genetic algorithm (SGA). In numerical examples, three sets of results are compared to discuss on the methodology for buckling optimization.

Optimization for the Maximum Buckling Loads of Laminated Composite Plates — Comparison of Various Design Methods　　　　　　　　　　　　　　　
Shinya HONDA, Yoshihiro NARITA, Katsuhiko SASAKI
Key Engineering Materials, 334-335, 89, 92, 2007, [Peer-reviewed]
English, Scientific journal

Buckling Optimization of Laminated Composite Plates by Minimizing Errors of the Discrete Lamination Parameters
HONDA Shinya, NARITA Yoshihiro
Transactions of the Japan Society of Mechanical Engineers. A, 72, 720, 1262, 1269, 一般社団法人日本機械学会, Aug. 2006, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, The fiber reinforced plastics (FRP) have been utilized in various structural applications of automobile and aerospace industries because they have excellent features of high specific strength and stiffness ratios. The FRP composites are fabricated typically by stacking orthotropic layers, each of which is composed of reinforcing fibers and matrix materials. In this work, an optimum design approach is proposed to optimize buckling performance of laminated composite plates by using the lamination parameters. The approach consists of two parts: the first part is to optimize the lamination para...

P98 Buckling Optimization of Composite Plates by Using Discretized Errors of Lamination Parameters
HONDA Shinya, NARITA Yoshihiro, SASAKI Katsuhiko
Proceedings of the 1992 Annual Meeting of JSME/MMD, 2005, 619, 620, The Japan Society of Mechanical Engineers, 2005
Japanese, Fiber Reinforced Plastics (FRP) has been utilized in applications of automobile and aircraft structures because of the high specific strength and stiffness ratios. These FRP composites are typically fabricated by stacking orthotropic laminas, each composed of reinforcing fibers and matrix materials. In this work, an optimum design approach is presented by using the lamination parameters with the gradient method, and is used to optimize buckling behaviors of laminated composite plates. This approach can derive the optimum lay-up design from the calculated values of the parameters, and yields the maximum buckling loads with corresponding optimum lay-ups (fiber orientation angles).

Evaluation of electric properties for carbon fiber reinforced plastics fabricated by electrodeposition resin molding method.
清水佑音, 本田真也, 佐々木克彦, 武田量, 片桐一彰, Dynamics & Design Conference (CD-ROM), 2023, 2023

絞り加工により成型した局所異方性を有する熱可塑性複合材の最適設計に関する研究
本田 真也, 天田財団助成研究成果報告書, 35, 356, 2022
公益財団法人 天田財団, Japanese

Optimal design and evaluation with ground structure based topology optimization
茅野皓輝, 本田真也, 片桐一彰, 佐々木克彦, 武田量, Dynamics & Design Conference (CD-ROM), 2021, 2021

Topological Optimization considering Thermal Deformation of a Cast Plate Structural Design
上田修生, 本田真也, 佐々木克彦, 武田量, 鈴木逸人, 戸羽篤也, 鶴谷知洋, 日本材料学会学術講演会講演論文集(CD-ROM), 70th, 2021

Estimation of Damping Characteristics and Optimization of Curved Fiber Orientation for Composites Fabricated by Electrodeposition Resin Molding
瀧澤拓, 本田真也, 片桐一彰, 佐々木克彦, 武田量, 構造強度に関する講演会講演集, 63rd, 2021

Fabrication and deformation test of UAV morphing wing structure by CFRP applying electrodeposition resin impregnation method
片桐一彰, PARK Tunsch, 山口真平, 本田真也, 佐々木克彦, 玉山雅人, 飛行機シンポジウム講演集(CD-ROM), 58th, 2020

電着法を用いてセルロースナノファイバーのシートで強化したCFRPの特性とその製造方法
片桐一彰, 山口真平, 永廣卓哉, 川北園美, 園村浩介, 尾崎友厚, 舘秀樹, 吉岡弥生, 武村守, 南沙也加, 本田真也, 佐々木克彦, 構造強度に関する講演会講演集, 60th, 2018

Strength of CFRP I-shaped beam with cellulose nanofibers dispersed on the surface
片桐一彰, 山口真平, 永廣卓哉, 園村浩介, 尾崎友厚, 川北園美, 武村守, 吉岡弥生, 本田真也, 佐々木克彦, 南沙也加, 金大貴, 日本複合材料合同会議(Web), 9th, 2018

Mechanical properties of CFRP corrugation manufactured by electro-activated deposition molding
片桐一彰, 山口真平, 永廣卓哉, 川北園美, 武村守, 吉岡弥生, 佐々木克彦, 本田真也, 南沙也加, LIGINE Florian, 飛行機シンポジウム講演集(CD-ROM), 56th, 2018

電着を用いた樹脂含浸法を適用したCFRPの強度特性
片桐一彰, 佐々木克彦, 本田真也, 冨沢祐介, 中島晶, 南沙也加, 山口真平, 尾崎友厚, 園村浩介, 垣辻篤, 構造強度に関する講演会講演集, 59th, 2017

Addition of Heat Storage Properties to CFRP by Using Electoro-activated Resin Molding
片桐一彰, 山口真平, 永廣卓哉, 尾崎友厚, 園村浩介, 吉岡弥生, 垣辻篤, 後藤凌平, 戸谷剛, 南沙也加, 本田真也, 佐々木克彦, 宇宙科学技術連合講演会講演集(CD-ROM), 61st, 2017

Molding and strength of CFRP by using electro-activated deposition
片桐一彰, 山口真平, 永廣卓哉, 尾崎友厚, 園村浩介, 吉岡弥生, 垣辻篤, 南沙也加, 本田真也, 佐々木克彦, 飛行機シンポジウム講演集(CD-ROM), 55th, 2017

G1000301 Free vibration of glass plates with various shape and thickness
KAITO Yoshihiko, HONDA Shinya, NARITA yoshihiro, Mechanical Engineering Congress, Japan, 2015, "G1000301, 1"-"G1000301-3", 13 Sep. 2015
Although there have been considerable number of technical papers that deal with free vibration of flat plates made of metal and composite materials, the vibration behavior of thin and thick sheet glass plates has not been clarified enough, and there has not been reported to answer the question of whether the classical plate theory is applicable to sheet glass plates. In the present report, vibration analysis and modal analysis measurement are conducted to compare both sets of natural frequencies and mode shapes, and the applicability of the conventional vibration analysis method is confirmed., The Japan Society of Mechanical Engineers, Japanese

J1010304 Vibration optimization of laminated composite plates with blended layers by using the Ritz method
NISHIOKA Fumiya, HONDA Shinya, NARITA Yoshihiro, Mechanical Engineering Congress, Japan, 2015, "J1010304, 1"-"J1010304-5", 13 Sep. 2015
An advantage of carbon fiber reinforced plastics (CFRP) is tailorable mechanical property by changing the lay-up designs since each layer has strong anisotropy. For more effective use of tailorable anisotropy of composites, an idea of using blended layers has recently been proposed. The blended layer has partly different fiber orientation angle in the same layer but straight fiber in each area, resulting in constant volume fraction of fibers. The present study proposes an analytical method for natural frequencies of the laminated plate with blended layers by using the Ritz method based on the classical lamination plate theory. The Ritz method makes it reasonable to conduct parametric study and optimization involving vast number of repeated calculations. The validity of calculation is verified by the comparison of results from the present method and FEM. Then, areas and their fiber orientation angles of blended layers are optimized by using a genetic algorithm to maximize their fundamental frequencies. Numerical results revealed the existence of specific tendencies in the fiber orientations of blended layers on boundary conditions of plate, and the plate can achieve higher fundamental frequencies than those from typical laminates. From above, it is demonstrated that the present method provides good accuracy for the laminated composites with blended layers and the effectiveness of the blended layer design., The Japan Society of Mechanical Engineers, Japanese

J2010205 Education of engineering mechanics by using Schaum's Outlines
NARITA Yoshihiro, HARADA Hiroyuki, HONDA Shinya, Mechanical Engineering Congress, Japan, 2015, "J2010205, 1"-"J2010205-5", 13 Sep. 2015
The present study introduces the education methodology on engineering mechanics by using Schaum's outline series as a textbook at Department of Mechanical and Intelligent System Engineering, Hokkaido University. Schaum's Outlines are a series of supplementary texts for college-level courses that are published by McGraw-Hill Education, and cover a wide range of academic subjects. Texts of Engineerng Mechanics "Statics" and "Dynamics" in the series are used in the class, and the reason why these supplementary texts were chosen is explained. Some students' responses are given and the advantage and disadvantage are discused from educational viewpoints., The Japan Society of Mechanical Engineers, Japanese

J1010202 Multi-objective Optimization of Productivity and Dynamics Strength of Fibrous Composite with Curvilinear Fibers
HAYASHI Toshiya, HONDA Shnya, NARITA Yoshihiro, Mechanical Engineering Congress, Japan, 2015, "J1010202, 1"-"J1010202-5", 13 Sep. 2015
The present study proposes a multi-objective optimization method of productivity and dynamic strength for the fibrous composite plate with curvilinear fibers. The fibrous composites have some problems in the practical application to structures. The productivity decreases and fiber density becomes nonuniform with increase in the maximum curvature of curvilinear fibers. Therefore, the relationships between the productivity and curvature are formulated by the experimental results and a practical optimum curvilinear fiber shapes are searched. Curvilinear fiber shapes are defined by the coefficients of the cubic polynomial function. Because principal strains are important in design of aircraft main wings, principal strains of the plate are calculated by the finite element method with eight-node quadrilateral isoparametric element. An Optimized Multi-Objective Particle Swarm Optimization (OMOPSO) based on the non-dominated sorting and crowded distance metric sorting is employed as an optimizer with an inertia weight controlled by the auto-tuning method. The numerical results showed that the present optimization considering the relationships between the density and curvature resulted in the more practical solutions than the previous solutions., The Japan Society of Mechanical Engineers, Japanese

J1010301 Robust design of a composite antenna structure by using multi-objective Taguchi method
TANAKA Soichiro, HONDA Sinya, NARITA Yoshihiro, Mechanical Engineering Congress, Japan, 2015, "J1010301, 1"-"J1010301-5", 13 Sep. 2015
CFRP (Carbon Fiber Reinforced Plastics) has been widely used to manufacture precise structures, such as antenna reflectors, due to their superior stiffness-to-weight and high dimensional stability as compared to the metallic materials. When one uses CFRP laminates to antenna reflectors for spacecraft, their vibration property becomes important. This is because antenna reflectors are often placed under sever vibration and acoustic noise environment due to the launch of spacecraft. In addition to this, harsh thermal variation becomes also serious problem. Antennas flying on the low Earth orbit are subjected to significant temperature variations, and the thermal deformation of antenna is inevitable. It is possible to suppress this vibration minimally if the laminates are stacked symmetrically. It is known, however, that CFRP laminates show unpredictable deformation caused by the ply angle misalignments during fabrication process. Since the ply angle misalignments are unavoidable so far, it is important to choose the lay-ups mitigating the effect of misalignment. The present paper proposes a multi-objective Taguchi method (MO-TM) to optimize the lay-ups of laminated antenna shell structure to maximize the fundamental frequency and minimize the thermal deformation in robust sense. Both vibration and thermal properties are evaluated by a finite element analysis, ANSYS. The validity of the present optimization is successfully confirmed by the comparison between obtained results from the MO-TM and those from the typical lay-ups., The Japan Society of Mechanical Engineers, Japanese

J1010104 Buckling optimization of composite shallow shells under general external pressures
TAMPO Tatsuya, HONDA Shinya, NARITA Yoshihiro, Mechanical Engineering Congress, Japan, 2015, "J1010104, 1"-"J1010104-5", 13 Sep. 2015
Composite materials are well known to have superior specific stiffness and strength to conventional metal materials. Due to the excellent material properties, composites contribute to lighten the structures in various industrial fields. Moreover, it is known that engineers can intentionally change dynamic properties of composites by designing their lay-up configuration. Among the composites, shell structures are often found in the automotive and aerospace industries, but this type of structures has technical problem causing the buckling due to various external loads. Therefore, it is important to investigate buckling response of those structures on the safety design. In this study, the effect of generally shaped pressure on buckling eigenvalues of laminated composite shells is studied and those lay-up configurations are optimized to maximize non-dimensional buckling load or buckling parameters. First, stress distributions of shells under general external pressure are calculated by the Ritz method. Then, eigenvalues as critical buckling loads under in-plane stresses are derived by the Ritz method again where in-plane stress distributions determined in the first step are included as the potential energy. Finally, the layerwise optimization (LO) method is applied to optimize lay-ups and to maximize buckling load of laminated composites shells, and obtained optimum solutions are successfully result in higher buckling load compared with the typical lay-ups., The Japan Society of Mechanical Engineers, Japanese

F102005 Optimization of composite wing structure by using curvilinear fiber
HONDA Shinya, NARITA Yoshihiro, Mechanical Engineering Congress, Japan, 2015, "F102005, 1"-"F102005-3", 13 Sep. 2015
A formulation method of arbitrary shaped curvilinear fibers for laminated fibrous composites is proposed and applied to the multi-objective optimization problem. Two conflicting objectives employed here are the maximum principal strain around circular hole as a mechanical property and throughput of productivity relating to fiber curvatures. As an optimizer, both improved non-dominated sorting genetic algorithm (NSGA2) and multi-objective particle swarm optimization (MOPSO) are used. Obtained solutions from the MOPSO are distributed in the wide range of objective function space compared with the NSGA2, and the solutions with curvilinear fibers indicate lower maximum strains than the solution with straight fibers. This reveals the possibility of composites with curvilinear fibers as an effective component of wing structure., The Japan Society of Mechanical Engineers, Japanese

111 Weight minimization of the composite laminates constrained by the aeroelastic characteristics
YOKOYAMA Gaku, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2015, "111, 1"-"111-7", 25 Aug. 2015
The present study minimizes weight of wings fabricated by laminated composite (CFRP) under aeroelastic constraint. The wing is simply approximated by a cantilever rectangular plate. The finite element analysis is used to calculate aeroelastic characteristics, flutter speed, of wing model. Weight of wings depends on the number of layers, and the distributed genetic algorithm (DGA), which has an advantage to deal with laminated plates with different numbers of, layers is employed as an optimizer. In the optimization, fiber orientation angles of laminated composites are assigned to design variables. The optimum wing model shows effective weight reduction with keeping the enough flutter speed. Results of structural analysis of optimized model clarify that stable torsional rigidity can acquire resistance to flutter., The Japan Society of Mechanical Engineers, Japanese

107 Finite element by refined zigzag theory and vibration optimization of composite sandwich plate
KUMAGAI Takahito, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2015, "107, 1"-"107-11", 25 Aug. 2015
The present study proposes a new finite element based on the the refined zigzag theory (RZT) and optimizes lay-ups of the composite sandwich plate with soft core to maximize the fundamental frequencies. The plate consists of the CFRP skins and core layer of polyvinyl chloride. The element is an isoparametric 8-node quadratic rectangular element. From the numerical experiment, the present method gives more accurate results than the first-order share deformation theory (FSDT) and incurs lower computational effort than three dimensional theory (3DT). In the optimization problem, the Boolean particle swarm optimization (BPSO) is employed to maximize the fundamental frequencies of the sandwich. Optimized results are compared with other typical lay-ups and this reveals that the Boolean PSO is suitable to the optimization problem of composite sandwich., The Japan Society of Mechanical Engineers, Japanese

136 The learning adaptive vibration control by using self-organizing maps
SUGAHARA Kyoichi, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2015, "136, 1"-"136-8", 25 Aug. 2015
This study applies self-organizing map (SOM) to control method for suppressing vibration of unknown object which varies dynamic characteristics. The SOM could convert the nonlinear statistical relationships between high-dimensional data into simple geometric relationships, usually a two dimensional grid of nodes. The presence method uses the SOM to estimate states of the controlled object and makes a statistical model about control input. Also the SOM is employed to establish evaluation criterion for rapid learning. The learnings are practiced when the effective control input is applied to the controlled object where the evaluation function of control system exceeds its evaluation criterion. The present method requires only information about input and output without any prior information, resulting in implementation of the vibration control without numerical models. This enables the present method to accept the change of dynamic characteristics.The present method is evaluated with the smart structure fabricated by Carbon Fiber Reinforced Plastic (CFRP) and piezoelectric actuators. Dynamic characteristics are changed by fastening vise and suspending weight. The result shows the presence method could suppress the vibration adaptively., The Japan Society of Mechanical Engineers, Japanese

101 Modeling and vibration behavior of touch panel in mobile phone
KAITO Yoshihiko, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2015, "101, 1"-"101-7", 25 Aug. 2015
Smartphones have been extensively used worldwide in recent years, and have functions to transfer information effectively by vibrating a panel. The panel is made of glass and fixed to the mobile phone's body by an adhesive tape. However, the vibration intensity is not strong enough and needs to be improved. Although a vast literatures dealing with vibration of plates exists, there has not been reported vibration of the glass panel fixed by the adhesive tape. This report presents simulation and experimental study on the forced vibration of glass panel used in the mobile phone. First, the authors derive an expression of the displacement of the plate by using Rayleigh-Ritz method. Here, the edges of the plate fixed by the adhesive tape are modeled by translational springs and rotational springs. Second, natural frequencies and mode shapes are calculated by using the derived equations for the plate with simply supported or elastic edges. Also, an experiment is conducted by using the modal analysis technique for glass test models. Finally, both results are compared to confirm the validity of the present calculation method., The Japan Society of Mechanical Engineers, Japanese

122 A Series Solution for Simply Supported Shallow Shells under External Pressure
TAMPO Tatsuya, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2014, 53, 11, 12, 27 Sep. 2014
The Japan Society of Mechanical Engineers, Japanese

424 Vibration analysis of laminated plate with blended layer by using the Ritz method
NISHIOKA Fumiya, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2014, 53, 109, 110, 27 Sep. 2014
The Japan Society of Mechanical Engineers, Japanese

425 Vibration analysis of passive constrained layer damping plate with patch by using zigzag theory
KUMAGAI Takahito, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2014, 53, 111, 112, 27 Sep. 2014
The Japan Society of Mechanical Engineers, Japanese

423 Effect of evaluation function in vibration controlling using self-organizing map
KIDA Naohiro, Honda Shinya, Narita Yoshihiro, 北海道支部講演会講演概要集, 2014, 53, 107, 108, 27 Sep. 2014
The Japan Society of Mechanical Engineers, Japanese

514 Optimization of laminate stacking sequence by Taguchi method : Use of lamination parameters
TANAKA Soichiro, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2014, 53, 129, 130, 27 Sep. 2014
The Japan Society of Mechanical Engineers, Japanese

513 Comparative Study of Auto-tuning Methods in Meta-heuristic Solutions
HAYASHI Toshiya, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2014, 53, 127, 128, 27 Sep. 2014
The Japan Society of Mechanical Engineers, Japanese

412 The effect of adding partial external layers on CFRP shafts
TAKENO Kazuma, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2014, 53, 97, 98, 27 Sep. 2014
The Japan Society of Mechanical Engineers, Japanese

411 Identification of material constants and elastic boundary condition of the plate with rigid bar using dynamic characteristics
FUNAMIZU Takahiro, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2014, 53, 95, 96, 27 Sep. 2014
The Japan Society of Mechanical Engineers, Japanese

327 Buckling Analysis of Laminated FRP Shallow Shells under General Pressure and Boundary Conditions
TAMPO Tatsuya, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2014, "327, 1"-"327-10", 25 Aug. 2014
Composite materials are known to have superior specific stiffness and strength to conventional metal materials. Due to the excellent material properties, composites contribute to lighten the structures in various industrial fields. Shell structures are often found in the automotive and aerospace industries, but this type of structures has technical problem causing the buckling due to various loadings. In this report, the effect of general pressure is studied on buckling eigenvalues of laminated composite shells. First, the stress distribution of shells under general pressure is solved by the Ritz method. Secondly, buckling eigenvalues under in-plate stresses are calculated in the Ritz method by using in-plate stress distributions determined in the first problem. By comparing the present numerical results with FEM, both sets of results closely agree each other, particularly in terms of the stress distribution. Moreover, the buckling behavior of the composite shells is confirmed by changing the shape of shells, boundary conditions and laminated configurations., The Japan Society of Mechanical Engineers, Japanese

339 Tuning and performance of GA and PSO in lay-up design problem
HAYASI Toshiya, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2014, "339, 1"-"339-12", 25 Aug. 2014
Carbon Fiber Reinforced Plastics (CFRP) can be used to tailor their mechanical properties by changing their lay-up design. In solving the lay-up design problem, meta-heuristic methods, such as Genetic Algorithm (GA) and Particle Swarm Optimization (PSO), are quite often employed. There exist some parameters to be decided properly in the meta-heuristic methods, and the performance of the optimization methods depends on the parameters. It is therefore important to introduce the parameter values appropriately (i.e., parameter tuning) for improvement of optimization performance. Recently, auto-tuning approaches are reported where the parameters are automatically determined according to the search situations. In this study, GA and PSO are applied to the lay-up design problem and the effects of parameters are evaluated. Then auto-tuning approaches are applied and compared each other. Comparative results clarify some effects of using different parameters and characteristics of each method. Furthermore, these also show the effectiveness of auto-tuning approaches and the improvement of the performance of GA and PSO in lay-up design problem., The Japan Society of Mechanical Engineers, Japanese

340 Robust design of antenna shell structure with respect to lay-ups and supports by Taguchi method
TANAKA Soichiro, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2014, "340, 1"-"340-12", 25 Aug. 2014
This study applies Taguchi method to optimize the structure of composite materials. CFRP (Carbon Fiber Reinforced Plastics) have been widely used to manufacture the precise structure, such as antenna reflectors, due to their lightweight and high dimensional stability as compared to the metallic materials. When one uses CFRP laminates to antenna reflectors for space telescopes, thermal deformation is a serious problem. This deformation can be suppressed if the laminates are stacked symmetrically. It is known, however, that CFRP laminates show unpredictable deformation caused by the ply angle misalignments. Since the ply misalignment is unavoidable, it is important to choose the lay-ups that mitigate the misalignment effects. In this study, the lay-ups and supporting positions are optimized in robust sense by using Taguchi method. As a result, it was shown that the optimal lay-ups and supporting positions could more effectively suppress the deformation than the typical lay-ups., The Japan Society of Mechanical Engineers, Japanese

338 Vibration and design of laminated shallow shell with blended layer
NISHIOKA Fumiya, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2014, "338, 1"-"338-9", 25 Aug. 2014
Carbon Fiber Reinforced Plastics (CFRP) can be used to tailor their mechanical properties by changing their lay-up design. For more effective use of lay-up design, an idea of using blended layers has recently been proposed. Blended layer is a layer with different fiber orientation angles in the same layer. In previous studies, the analysis of laminated composite plates with blended layer was made, but the analysis of laminated shallow shells with blended layer has not been studied yet. The present study proposes an analysis for natural frequency of the shallow shell with blended layer by using the Ritz method based on Donnel-Mushtari theory. The validity of analysis is verified by the comparison of the present result with the finite element method (FEM). Numerical examples clarifies that there exist some tendencies between the shape of shallow shell and the blended layer parameters. It also shows different characteristics depending upon boundary conditions. From these results, it is demonstrated that the present method provides good accuracy solution and the future technical potentials for the use of the blended layers of laminated shallow shells., The Japan Society of Mechanical Engineers, Japanese

3B31 Multi-objective optimization for vibration suppression of smart laminated composites(The 12th International Conference on Motion and Vibration Control)
HONDA Shinya, WATANABE Kazuki, NARITA Yoshihiro, KAJIWARA Itsuro, Dynamics and Design Conference, 2014, 12, "3B31, 1"-"3B31-10", 03 Aug. 2014
The present paper proposes a multi-objective optimization technique for smart laminated composites to maximize two conflicting objectives. The first objective is the performance of active vibration control of smart composite with piezoelectric (PZT) actuators. The second is the fundamental frequency of smart structures related to the performance of passive vibration control. Both performances of active and passive vibration control are maximized simultaneously. The vibration suppression of smart structures strongly depends on both actuator placements and vibration mode shapes. It is possible to design vibration mode shapes for laminated fibrous composites since their anisotropy for whole thickness is tailorable by arranging fiber orientation angle in each layer. This allows the smart structure with laminated composite to archive higher performance of vibration suppression than those with isotropic materials. However, the optimized structure results in lower natural frequencies than composites with typical fiber orientation angles since an effective input of control force from actuators is realized for the structure with lower stiffness. This reveals that there is a trade-off relation for smart composite structures between the performance of active vibration suppression and natural frequencies. To disclose this relation, the present study applies the effective multi-objective optimization technique, the refined non-dominated genetic algorithm (NSGAII), and obtains Pareto optimal solutions. Calculated results are successfully validated by a comparison with those from the real-time control experiment where a laser excitation technique which is effective to small sized structures is used., The Japan Society of Mechanical Engineers, English

3B11 Adaptive vibration control using self-organizing map(The 12th International Conference on Motion and Vibration Control)
KIDA Naohiro, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference, 2014, 12, "3B11, 1"-"3B11-8", 03 Aug. 2014
An adaptive control method using a self-organizing map (SOM) which is a kind of neural networks is proposed to suppress vibration of a cantilever plate. The SOM learns characteristics of given data without supervising and categorizes high dimensional data into low dimensional maps with keeping complex relationships among data. The present method employs the SOM to estimate states of the controlled object and makes a lookup table of control input. Each node of the state estimation SOM consists of vectors including current and past controlled responses and control inputs. The SOM and corresponding lookup table learn and are updated only when the effective control input is applied to the controlled object where the evaluation function of control system is defined by differences between the desired and current state. The present method just requires information about the control response and input to build the statistical model on site, resulting in implementation of the vibration control without numerical models in advance for controlled object. Numerical and experimental results are given for the cantilever plate fabricated by an aluminum plate and a piezoelectric actuator, and the effectiveness of the present method is successfully confirmed from both results., The Japan Society of Mechanical Engineers, English

405 Maximization of Vibration Control Performance for Smart Composite Shell by Optimizing Shell Shape
Li Lei, Honda Shinya, Narita Yoshihiro, 北海道支部講演会講演概要集, 2013, 52, 99, 100, 28 Sep. 2013
The Japan Society of Mechanical Engineers, Japanese

J-1-3-110 Maximization of natural frequencies for composite laminated plate with rigid body
FUNAMIZU Takahiro, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2013, "110, 1"-"110-7", 25 Aug. 2013
It is important for designers to consider the lay-up configuration of the composite laminated plate to fit into their technical purpose because their strength, stiffness and natural frequencies depend on the lay-up configuration. Vibration analysis and optimization of lay-up configuration of the composite laminated plate with rigid bodies are considered for the maximization of the fundamental frequency in this study. The Ritz method is employed to analyze the vibration of the plate and the accuracy of the present method is confirmed by comparing the analytical and experimental result. This study also employs the layerwise optimization (LO) method to optimize the lay-up configuration and the validity of the optimized results is demonstrated by comparing fundamental frequencies of plates with the optimum lay-up configuration and with several plates which have typical lay-up configurations. The Ritz method requires less calculation load as compared with the finite element analysis and has an advantage when the method is applied to the optimization problem with the large number of repeated calculations., The Japan Society of Mechanical Engineers, Japanese

J-1-3-108 Vibration Analysis of Passive Constrained Layer Damping Plate by Using Zigzag Theory
KUMAGAI Takahito, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2013, "108, 1"-"108-10", 25 Aug. 2013
The present study proposes an analysis for natural frequencies and modal damping ratios for the passive construed layer damping (PCLD) plates by using the Ritz method based on the zigzag theory. The PCLD plate is a sandwich structure which consists of the basement plate, the viscoelastic layer and the constraining plate. Due to the large difference of mechanical properties between the viscoelastic layer and other layers, it is difficult to predict the deformation behavior of PCLD plate by the thin plate theories. The refined zigzag theory (RZT) approximates deformation of each layer by linear functions respectively, and this makes it possible to calculate the deformation of PCLD plates accurately. Polynomial functions which satisfy arbitrary sets of boundary conditions with boundary indexes are applied to the RZT. Calculated results agree well with results from the experiment and three dimensional finite element analysis., The Japan Society of Mechanical Engineers, Japanese

J-1-4-112 Evaluation of torsional vibration characteristics for CFRP shafts
TAKENO Kazuma, TAKAHASHI Keisuke, HONDA Shinya, NAKAMURA Takato, WAKABAYASHI Masaki, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2013, "112, 1"-"112-10", 25 Aug. 2013
This study performs evaluation on torsional vibration characteristics of Carbon Fiber Reinforced Plastic (CFRP) shafts by using an experimental modal analysis technique with strain gauges and accelerometers. These CFRP shafts are usually fabricated by three kinds of layers; straight layer (0°), hoop layer (90°), and bias layer (45°). Due to the existence of bias layers, the CFRP shaft invokes the torsional vibration by the excitation in the bending direction. It is important to reveal the dynamic behavior, including the torsional mode, for effective utilization of CFRP shafts. Natural frequencies of 18 types of CFRP shafts with various lay-up configurations are measured to investigate the effect of each layer on vibration characteristics, and the mode which is not detected by the accelerometer but is measured by the strain gage can be distinguished as the torsional mode. It is demonstrated from experimental results that each layer has respective roles on vibration performances of CFRP shafts., The Japan Society of Mechanical Engineers, Japanese

B33 Adaptive vibration control using self-organizing map
KIDA Naohiro, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference, 2013, 13, "B33, 1"-"B33-9", 25 Aug. 2013
An adaptive control method is proposed to suppress vibration of smart structures by using a self-organizing map (SOM), one type of neural networks. The SOM learns characteristics of given data without supervising, and categorizes high dimensional data into low dimensional maps with keeping complex relationships among data. The present method employs the SOM to estimate states of the controlled object and makes a lookup table of control input. Each node of the state estimation SOM consists of vectors including controlled responses and control input. The SOM and lookup table learn and are updated only when the effective control input is applied to the controlled object where the evaluation function of control system is defined by difference between the desired state and current state. The present method just requires information about the control response and input, resulting in implementation of the vibration control without numerical models. Numerical and experimental results are given for the smart structure fabricated by an aluminum plate and piezoelectric actuators, and effectiveness of the present method is confirmed from both results., The Japan Society of Mechanical Engineers, Japanese

CFRP管体の動特性に関する研究—Study on dynamic characteristics of CFRP pipe
本田 真也, 研究報告書 フジクラ財団 [編], 1, 12, 2013
[東京] : フジクラ財団, Japanese

440 Multidisciplinary Design Optimization of Micro Smart Composites and Evaluation of Vibration Control Performance by Laser Excitation
WATANABE Kazuki, HONDA Shinya, NARITA Yoshihiro, KAJIWARA Itsuro, Dynamics & Design Conference, 2012, "440, 1"-"440-10", 18 Sep. 2012
Smart micro composites are designed optimally for the vibration suppression. The present smart structures are composed of graphite/epoxy (CFRP) composites and PZT actuators. Performance of vibration control strongly depends on actuator placements and modal shapes of structure. It is possible to specify vibration mode shapes for laminated composites by varying stacking combinations of angles of reinforcing fibers. In this paper, vibration control performance is maximized by optimizing fiber orientation angle, PZT actuator placement, and weight parameters in the control system simultaneously. A simple genetic algorithm method with modal database is used as an optimizer. Based on the numerical results, the experimental verification is conducted with an innovative excitation method using a laser abrasion technique. Since the pulse laser is irradiated precisely at the same position with same power repeatedly, this method makes it possible to excite micro structures with high reproducibility. Calculated results show that the optimized smart micro composite has superior performance of vibration suppression to some representative ones, and experimental results validate the present multidisciplinary optimization technique., The Japan Society of Mechanical Engineers, Japanese

804 Evaluation of Vibration Characteristics for Composite Shallow Shell with Bi-stable Shape Invoked by Asymmetric Laminate
TAKAHASHI Keisuke, HONDA Shinya, NARITA Yoshihiro, Dynamics & Design Conference, 2012, "804, 1"-"804-10", 18 Sep. 2012
Asymmetric laminates of fibrous composites have strong elastic and thermal anisotropic properties, resulting in the curved surfaces caused by residual thermal strain during curing process. Specific asymmetric laminates indicate bi-stable states in terms of surface shapes, and these bi-stable states enable large deformation with relatively small energy input. This becomes an advantage when the asymmetric laminate is applied to the aerospace structures such as a morphing airfoil. The present paper first reveals occurrence criteria of bi-stable states for asymmetric laminates. In-plane buckling strengths are employed as an index of occurrence and calculated for plates with different width-to-thickness ratio and lay-up configurations. Then, vibration properties of bi-stable composite shells are evaluated by using both numerical study with the Ritz method based on Donnel-Mushtari theory and the experimental modal analysis technique. The numerical and experimental results show that there are some relations between the buckling strength and the occurrence of bi-stable states within plates having specific lay-up configurations, and asymmetric laminates with bi-stable states indicate different vibration characteristics before and after snap-thorough deformation., The Japan Society of Mechanical Engineers, Japanese

806 Vibration optimization of laminated composite plates with locally anisotropic structures invoked by optimum thickness placements
YUGAMI Kumpei, HONDA Shinya, NARITA Yoshihiro, Dynamics & Design Conference, 2012, "806, 1"-"806-10", 18 Sep. 2012
The present study proposes an optimization method of laminated CFRP plates with variable thickness. The objective function is the fundamental frequency calculated by the originally developed finite element code with a 4-node rectangular (ACM) element, and design variable are placements of elements with reinforcement layer. A simple genetic algorithm method is employed with elitist tactics as an optimizer. The obtained plates with optimum placement of reinforcements and optimum fiber orientation angle result in the highest fundamental frequency among representative models. Then, based on the optimization results, the test specimens are fabricated by using hand lay-up and vacuum curing technique with pattern paper which keeps thicknesses difference clearly. Measured frequencies and modes shapes agree well with the calculated results and the fabricated optimum plate also indicates the higher fundamental frequency than other representative ones. Furthermore, the optimum variable thickness plate yields higher frequency compared with the homogenous thickness plate due to its small mass. This observation demonstrates an advantage of the variables thickness plate in terms of vibration characteristics., The Japan Society of Mechanical Engineers, Japanese

807 Modal Analysis and Vibration Optimization of Laminated Rectangular Plates with Point Masses
NARITA Yoshihiro, HONDA Shinya, Meng Xuan, Kauppi Antti, Dynamics & Design Conference, 2012, "807, 1"-"807-9", 18 Sep. 2012
The modal analysis is applied both experimentally and numerically to study vibration characteristics of a symmetrically laminated rectangular plate with point masses attached on the surface. The problem is solved numerically by using the Ritz solution, which is derived theoretically from the functional with the kinetic energy of the added point masses, and the results are obtained to study the effect of the point masses on vibration behavior. Then, the experimental modal analysis is used to measure the natural frequencies and mode shapes. The two sets of results are compared and turned out in good agreement. Subsequently, the lay-up design problem is considered to maximize the fundamental frequencies by use of the layerwise optimization (LO) approach. The design variables are taken for a set of fiber orientation angles in the symmetric layers., The Japan Society of Mechanical Engineers, Japanese

805 Vibration Optimization of Laminated Composites with Curvilinear Fibers Described by Spline Surface
TSUBATA Ryo, HONDA Shinya, NARITA Yoshihiro, Dynamics & Design Conference, 2012, "805, 1"-"805-8", 18 Sep. 2012
The present study aims to optimize vibration characteristics of the fibrous composite plate with curvilinear fibers. Curvilinear fiber shapes are defined by the projections of contour lines for the surface which is expressed by multi-spline function. The curved surface of spline interpolation is defined by 25 data points, and their heights (z coordinates) are used as the design variables. The plate is limited to symmetric and balanced layup. Fundamental frequencies of the plate are calculated by an originally developed finite element code with iso-parametric 8-node elements. The optimization is carried out by applying a simple genetic algorithm with the maximum curvature constraint employed as the practicality index in the manufacturing process. Five different sets of boundary conditions are used in numerical experiments. Optimization results show that the curvilinear fiber shapes result in different shapes and higher fundamental frequencies for all boundary conditions, as they are compared to previous results where cubic polynomials are used to define for fiber shapes., The Japan Society of Mechanical Engineers, Japanese

518 Vibration Characteristics of Un-symmetrically Laminated Rectangular Plates
Lee Seung-Cheol, Yugami Kumpei, Honda Shinya, Narita Yoshihiro, 北海道支部講演会講演概要集, 2011, 50, 185, 186, 01 Oct. 2011
The Japan Society of Mechanical Engineers, Japanese

515 Vibration optimization of a laminated rectangular plate with an elliptical hole
TOMIHASHI Kazuya, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2011, 50, 179, 180, 01 Oct. 2011
The Japan Society of Mechanical Engineers, Japanese

517 Vibration Property of CF/Al Hybrid Composite Plates with Veined Structure
Yugami Kumpei, Honda Shinya, Narita Yoshihiro, 北海道支部講演会講演概要集, 2011, 50, 183, 184, 01 Oct. 2011
The Japan Society of Mechanical Engineers, Japanese

516 Maximizing of natural frequency of composite material with 3-D local anisotropic structure
Ishibashi Yuta, Honda Shinya, Narita Yoshihiro, 北海道支部講演会講演概要集, 2011, 50, 181, 182, 01 Oct. 2011
The Japan Society of Mechanical Engineers, Japanese

357 Evaluation of Damping Property for the Flexible Double-walled Pipes with Infilling Materials
MINAMI Takashi, HONDA Shinya, NARITA Yoshihiro, SATO Motohiro, Dynamics & Design Conference, 2011, "357, 1"-"357-8", 05 Sep. 2011
It is well known in the fields of nuclear and chemical plants that various pipes conveying liquids and gasses should be safe and reliable against excitation by earthquakes. This study proposes an effective use of the flexible pipe system, consisting of a double-walled pipes and infilling materials, to increase the bending rigidities and robustness to excitation. In particular, the vibration properties of such double-walled flexible pipe are examined in terms of changes of infilling rates. Aluminum pipes and glass beads are employed in the experiment to assemble the flexible pipe, and the natural frequencies and damping ratios are measured by using an experimental modal analysis technique with an impulse hammer. The present double-walled pipe system with beads successfully results in higher damping ratios than the pipe without beads. To reveal further relationship between infilling rates and damping ratios, experiments for the single-walled pipe with different filling rates are also conducted. It becomes then clear that there is a moderate filling rate to improve the damping properties of the flexible pipe., The Japan Society of Mechanical Engineers, Japanese

103 Multidisciplinary design optimization for the smart composite by using lamination parameters
KOSAKA Kou, HONDA Shinya, NARITA Yoshihiro, KAJIWARA Itsuro, Dynamics and Design Conference : D & D, 2011, 17, 17, 04 Sep. 2011
The Japan Society of Mechanical Engineers, Japanese

217 Multi-objective optimization of fibrous composite reinforced by curvilinear fibers
IGARASHI Teruki, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2011, 39, 39, 04 Sep. 2011
The Japan Society of Mechanical Engineers, Japanese

351 Vibration analysis of laminated composite plates under centrifugal forces
WADA Masaaki, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2011, 61, 61, 04 Sep. 2011
The Japan Society of Mechanical Engineers, Japanese

347 Optimum Vibration Design of Hybrid Plates Locally Reinforced by Fibrous Composites
HONDA Shinya, KOSHIBA Takashi, NARITA Yoshihiro, Dynamics and Design Conference : D & D, 2011, 60, 60, 04 Sep. 2011
The Japan Society of Mechanical Engineers, Japanese

B209 Multi-objective optimization on vibration and fiber curvatures of laminated composites reinforced by curvilinear fibers
IGARASHI Teruki, HONDA Shinya, NARITA Yoshihiro, Dynamics and Design Conference, 2011, 12, 339, 342, 28 Jun. 2011
The present study proposes a multi-objective optimization method to maximize the fundamental frequencies and minimizing production cost for the fibrous composite plate with curvilinear fibers. The production cost is represented by the average curvature of the curvilinear fibers. Curvilinear fiber shapes are defined by the projections of contour lines for a cubic polynomial surface, and the coefficients of the polynomial are employed as design variables. A finite element code with isoparametric 8-node rectangular element based on the first order shear deformation theory is employed to exploit the frequencies of plates. An improved non-dominated sorting genetic algorithm (NSGA-II) based on the non-dominated sorting and crowded distance metric sorting is used as an optimizer with a mutation whose probability is controlled to maintain the variety of individuals and to keep searching ability strong. The numerical results showed that the present optimization method resulted in the widely distributed Pareto-optimum front ranging from parallel fibers to largely curved fibers., The Japan Society of Mechanical Engineers, Japanese

(17)局所的な異方性を有する繊維強化複合材料の解析と最適設計の研究(研究奨励,日本機械学会賞〔2010年度(平成22年度)審査経過報告〕)
本田 真也, 日本機械学會誌, 114, 1110, 329, 329, May 2011
一般社団法人日本機械学会, Japanese

充填物を有するフレキシブル二重配管の振動減衰性能評価
南貴士, 本田真也, 成田吉弘, 佐藤太裕, Dyn Des Conf (CD-ROM), 2011, ROMBUNNO.357, 2011
Japanese

302 Optimization of the smart laminated composites for the vibration control
HONDA Shinya, NARITA Yoshihiro, KAJIWARA Itsuro, NAKAMURA Satoshi, 最適化シンポジウム講演論文集, 2010, 9, "302, 1"-"302-5", 09 Dec. 2010
The present smart composite structures are composed of PZT actuators and graphlte-epoxy composites to improve the performance of vibration suppression. The control performance of PZT actuators strongly depends on their placements and vibration characteristics of laminated composites are varied by their lay-up configurations. Thus, a multidisciplinary optimization method employing actuator placements, lay-ups of laminated composite plates and control systems as design variables is proposed here. First, a database containing the frequencies and modal matrixes is made to avoid the FEA repeatedly. Then, the H_2 norm of control response is minimized with respect to the above design variables with referring the database by a simple genetic algorithm with assuming that the state feedback is available. Finally, the output feedback system is reconstructed with the dynamic compensator based on the linear matrix inequality (LMI) approach. The effectiveness of the present optimization technique is confirmed by the experimental and numerical results., The Japan Society of Mechanical Engineers, Japanese

105 Numerical Simulation and Experiment for the Multilink System
Kitagawa Yu, Maeda Hideki, Narita Yoshihiro, Honda Shinya, 北海道支部講演会講演概要集, 2010, 49, 9, 10, 07 Nov. 2010
The Japan Society of Mechanical Engineers, Japanese

103 Vibration Analysis for the Link System of Rigid and Elastic Bodies with Elastic Hinges
Maeda Hideki, Kitagawa Yu, Honda Shinya, Narita Yoshihiro, 北海道支部講演会講演概要集, 2010, 49, 5, 6, 07 Nov. 2010
The Japan Society of Mechanical Engineers, Japanese

102 Vibration Analysis of laminated Spherical Shells with Fixed Two Poles
FUJII Toshinori, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2010, 49, 3, 4, 07 Nov. 2010
The Japan Society of Mechanical Engineers, Japanese

207 Vibration Property of Laminated VGCF/Al Circular Plates
KOYA Naoaki, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2010, 49, 33, 34, 07 Nov. 2010
The Japan Society of Mechanical Engineers, Japanese

209 Stacking sequence optimization of a laminated elliptical plate
Lee Seung-Cheol, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2010, 49, 37, 38, 07 Nov. 2010
The Japan Society of Mechanical Engineers, Japanese

108 Stacking sequence optimization of rotating rectangular plate under centrifugal force
WADA Masaaki, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2010, 49, 15, 16, 07 Nov. 2010
The Japan Society of Mechanical Engineers, Japanese

213 Vibration optimization for composite model plate reinforced by practical curvilinear fiber
Yugami Kumpei, Honda Shinya, Narita Yoshihiro, 北海道支部講演会講演概要集, 2010, 49, 45, 46, 07 Nov. 2010
The Japan Society of Mechanical Engineers, Japanese

109 Vibrational optimization for locally reinforced CFRP/Al Hybrid Plates
KOSHIBA Takashi, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2010, 49, 17, 18, 07 Nov. 2010
The Japan Society of Mechanical Engineers, Japanese

214 Vibration characteristics of circular pipes with filling materials
MINAMI Takashi, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2010, 49, 47, 48, 07 Nov. 2010
The Japan Society of Mechanical Engineers, Japanese

3203 Kansei Evaluation for Perception of Objects : Focus on the Relationship between 3D object model and impression
LEE Miyong, HONDA Shinya, NARITA Yoshihiro, 設計工学・システム部門講演会講演論文集, 2010, 20, "3203, 1"-"3203-2", 27 Oct. 2010
It is different by an individual how to feel about objects, and it is a subjective characteristic by the Kansei of the individual. This study aimed to evaluate an impression of the three-dimensional objects using the Kansei evaluation, and to investigate an element of the 3D objects and the connection with the impression. As the results of experiment, the shapes which became the first impression correspond with the element of the 3D objects. Therefore we think that the elements and the impressions are related deeply. This study becomes the fundamental researches in the manufacturing such as mechanical engineering, Kansei engineering and the product design., The Japan Society of Mechanical Engineers, Japanese

2401 User Category based on Quantitative Information in Kansei Evaluation
LEE Miyong, HONDA Shinya, NARITA Yoshihiro, The Computational Mechanics Conference, 2010, 23, 485, 486, 23 Sep. 2010
The Japan Society of Mechanical Engineers, Japanese

1501 Multidisciplinary design optimization of smart composites for vibration control
HONDA Shinya, NARITA Yoshihiro, KAJIWARA Itsuro, The Computational Mechanics Conference, 2010, 23, 580, 581, 23 Sep. 2010
The Japan Society of Mechanical Engineers, Japanese

134 Simultaneous Optimization of Surface Shapes and Lay-up Configurations for Composite Shells
Kato Takeru, HONDA Shinya, NARITA Yoshihiro, Dynamics & Design Conference, 2010, "134, 1"-"134-6", 14 Sep. 2010
Shapes and lay-up configurations of composite laminated shallow shells are optimized simultaneously to maximize the fundamental frequency by a simple genetic algorithm method with the elitist tactics. The shell shape is defined by a cubic polynomial and various shapes of shells with inconstant curvature radii can be expressed by varying the value of coefficient for each term. The coefficients and the lay-up configuration of the laminated shell are directly employed as design variables, and constraints are imposed on the coefficients and curvature radii to keep shells shallow. The frequencies are calculated by using the Ritz method due to its flexibleness for shell shapes. Results of the present analysis technique agreed well with experimental and finite element analysis results in terms of frequencies and mode shapes, obtained optimum solutions resulted in higher fundamental frequencies than the shells with general shapes and lay-up configurations., The Japan Society of Mechanical Engineers, Japanese

133 Experimental Modal Analysis and Optimization of Composite Material Model Reinforced by Curvilinear Fibers
HONDA Shinya, YUGAMI Kumpei, NARITA Yoshihiro, Dynamics & Design Conference, 2010, "133, 1"-"133-5", 14 Sep. 2010
The vibration characteristics of the composite plate model with curvilinear fibers are investigated in this study. The curvilinear fiber is realized by the plastic deformation of steel wires and the present composite model is composed of the curved steel wires and epoxy resin. The natural frequency and mode shape are obtained by the experimental modal analysis method where the plate is excited by the impulse hammer and acceleration response is measured. The experimental results showed that the present model has the specific skewed mode shape and it agrees well with the finite element analysis result in terms of the frequency and mode shape. Then the curvilinear fiber shape is optimized for the maximum fundamental frequency by using the genetic algorithm method. The numerical results showed that the optimum curvilinear fiber results in the higher fundamental frequency than the plate with typical curvilinear fibers., The Japan Society of Mechanical Engineers, Japanese

419 Minimum Design of Stress Concentration for Laminated Composite Plates with Curvilinearly Shaped Fibers
Owatari Kosuke, Honda Shinya, Narita Yoshihiro, 北海道支部講演会講演概要集, 2009, 48, 143, 144, 28 Nov. 2009
The Japan Society of Mechanical Engineers, Japanese

101 Study on Free Vibration of Twisted Thin Panels
AOKI Ryoji, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2009, 48, 1, 2, 28 Nov. 2009
The Japan Society of Mechanical Engineers, Japanese

105 Analysis of Laminated VGCF/Al Circular Plates Considering Thermal Effects
KOYA Naoaki, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2009, 48, 9, 10, 28 Nov. 2009
The Japan Society of Mechanical Engineers, Japanese

111 Experiment and Dynamic Analysis of Hanging Structural Components : 2^ report. Experimental analysis
Maeda Hideki, Kitagawa Yu, Narita Yoshihiro, Honda Shinya, 北海道支部講演会講演概要集, 2009, 48, 21, 22, 28 Nov. 2009
The Japan Society of Mechanical Engineers, Japanese

102 Vibration Property of Laminated Hybrid Plates
KOSHIBA Takashi, NARITA Yoshihiro, HONDA Shinya, 北海道支部講演会講演概要集, 2009, 48, 3, 4, 28 Nov. 2009
The Japan Society of Mechanical Engineers, Japanese

110 Dynamic Analysis and Experiment of Hanging Structural Components : 1^ report. Theoretical analysis
Kitagawa Yu, Maeda Hideki, Narita Yoshihiro, Honda Shinya, 北海道支部講演会講演概要集, 2009, 48, 19, 20, 28 Nov. 2009
The Japan Society of Mechanical Engineers, Japanese

107 Experimental Verification for Vibration Property of Shallow Shells with Various Curvatures
Kato Takeru, Narita Daisuke, Honda Shinya, Narita Yoshihiro, 北海道支部講演会講演概要集, 2009, 48, 13, 14, 28 Nov. 2009
The Japan Society of Mechanical Engineers, Japanese

106 Optimum Solutions and Experimental Verification for Vibration of Laminated Parallelogram Plates
FUJII Toshinori, HONDA Shinya, NARITA Yoshihiro, 北海道支部講演会講演概要集, 2009, 48, 11, 12, 28 Nov. 2009
The Japan Society of Mechanical Engineers, Japanese

231 Vibration Analysis and Optimization of Laminated Parallelogram Plates Based on the FSDT
FUJII Toshinori, HONDA Shinya, NARITA Yoshihiro, Dynamics & Design Conference, 2009, "231, 1"-"231-6", 03 Aug. 2009
The carbon fiber reinforced plastics (CFRP) is classified as high performance composite materials that are superior to conventional materials in the specific strength and stiffness ratios. They are applied to light-weight structures in aircraft and space industries. In such fields, wings are often approximated as a parallelogram plate, but the past studies were carried out by using the classical plate theory. This analysis is however based on the shear deformation plate theory (FSDT). A Ritz method is used to calculate natural frequencies of symmetrically laminated parallelogram plates, and the layerwise optimization method is used to optimize the best lay-up designs. It is shown that the LO method is applicable to the parallelogram plates successfully., The Japan Society of Mechanical Engineers, Japanese

254 Vibration Analysis and Optimization of Laminated Hybrid Thick Plates
KOSHIBA Takashi, HONDA Shinya, NARITA Yoshihiro, Dynamics & Design Conference, 2009, "254, 1"-"254-6", 03 Aug. 2009
A method of analysis is presented for determining the free vibration frequencies of hybrid laminated plates, and the layerwisr optimization method is used to determine the optimum fiber orientation angles for the maximum fundamental frequency under general edge conditions. The hybrid plates made of aluminum core and CFRP skins are made for reducing the material costs. Based on the first-order shear deformation theory (FSDT) applicable to thick plates, the Ritz solution is used to derive a frequency equation, and these results give good agreement with those from finite element method. An extensive set of numerical results is given in tabular and graphical form, illustrating the maximum fundamental frequency with the optimum lay-ups of the laminated hybrid plates. Comparison of the results gives tendencies caused by boundary conditions and laminated composition., The Japan Society of Mechanical Engineers, Japanese

OS0501 Buckling Analysis for Fiber Reinforced Composite Materials with Local Anisotropy
HONDA Shinya, OONISHI Yoshimasa, NARITA Yoshihiro, M&M材料力学カンファレンス, 2009, 357, 358, 24 Jul. 2009
The Japan Society of Mechanical Engineers, Japanese

208 Maximizing the fundamental frequency of laminated composite plates with optimally shaped curvilinear fibers
HONDA Shinya, NARITA Yoshihiro, SASAKI Katsuhiko, 最適化シンポジウム講演論文集, 2008, 8, 185, 190, 26 Nov. 2008
A new design method is proposed here to maximize the fundamental frequency of laminated composite plates reinforced by curvilinear fibers. Spline functions represent arbitrarily shaped fibers and Ritz solutions generate frequency equations. The optimum curvilinear shapes are searched for the maximum fundamental frequencies using genetic algorithms, and the increments of data points which define the spline shape are used as design variables under the limited range of undulation. Comparison of the present analysis method gives good agreement with the finite element method in terms of natural frequencies and vibration modes, and the optimized results show that the present plate with optimally shaped curvilinear fibers gives higher or equal fundamental frequencies than those of the conventional plate with optimally oriented parallel fibers., The Japan Society of Mechanical Engineers, Japanese

169 Optimization Method for Vibration of Fibrous Composite Plates : Comparison between Experimental Design and Other Methods
上甲 康之, 趙 希禄, 本田 真也, 成田 吉弘, Dynamics & Design Conference, 2008, "169, 1"-"169-6", 02 Sep. 2008
It is desirable to optimize the fiber orientation angles to maximize the fundamental frequencies of the fiber reinforced plastic plates. The optimization is studied here by using the experimental design for nonlinear problems, and it turned out that significantly less number of calculations is necessary as compared to other methods, such as a layerwise optimization approach (LOA). The numerical examples show that assumption of appropriate level values is efficient to obtain the optimum frequency in the vibration problem., The Japan Society of Mechanical Engineers, Japanese

406 Locally Anisotropic Design of Fibrous Composite Plate with Optimally Distributed Short Fibers
HONDA Shinya, NARITA Yoshihiro, SASAKI Katsuhiko, 北海道支部講演会講演概要集, 2007, 46, 105, 106, 29 Sep. 2007
The Japan Society of Mechanical Engineers, Japanese

203 Vibration Design of Fibrous Composite Plate with Optimally Distributed Short Fibers
HONDA Shinya, NARITA Yoshihiro, Dynamics & Design Conference, "203, 1"-"203-6", 2007
A new design method of functional fiber reinforced plastics (FRP) materials which imitates the micro structure of bone or shell in the natural world is proposed in this work. The material has local anisotropy induced by optimally distributed short fibers. The present design method combines a genetic algorithm method (GA) with layerwise optimization concept. The first frequency of thin plates is chosen as an objective function to be maximized in the optimization and it is turned out that the present plates always give higher natural frequencies compared to conventional plates which are reinforced by parallel fibers. Moreover, it is also revealed that optimally distributed short fibers tend to be allocated with certain tendency., The Japan Society of Mechanical Engineers, Japanese

224 Minimum Weight Design on Buckling of Laminated Plates Using Lamination Parameters
HONDA Shinya, NARITA Yoshihiro, 最適化シンポジウム講演論文集, 2006, 7, 275, 280, 08 Dec. 2006
A lamination parameter approach, recently proposed by the authors, is extended in this work to solve a minimum weight design problem for optimizing buckling behavior of laminated composite plates. The present approach basically consists of two parts: the first part is to optimize the lamination parameters by a gradient method, and the second part is to obtain the optimum lay-up (i.e., the fiber orientation angles) by minimizing the errors between the optimum parameters and the parameters for all possible discrete lay-up designs. In the extension of approach, the minimum number of layers with equal thickness is determined so that the plate has higher buckling loads than the specified values. Numerical examples demonstrate that the proposed approach is quite effective in determining the optimum lay-ups for the minimum weight design., The Japan Society of Mechanical Engineers, Japanese

313 Minimum Weight Design on Buckling of Laminated Plates
HONDA Shinya, NARITA Yoshihiro, SASAKI Katsuhiko, 北海道支部講演会講演概要集, 2006, 45, 105, 106, 25 Sep. 2006
The Japan Society of Mechanical Engineers, Japanese

726 Vibration and Discrete Optimization of Laminated Plates by Using Lamination Parameters
NARITA Yoshihiro, HONDA Shinya, Dynamics & Design Conference, 2005, "726, 1"-"726-6", 22 Aug. 2005
The fiber reinforced plastics (FRP) have been utilized in applications of automobile and aircraft structures, since they have advantages of high specific strength and stiffness ratios. The FRP composites are typically fabricated by stacking orthotropic layers, each composed of reinforcing parallel fibers and matrix material. In this work, the optimum lamination parameters are determined by the mathematical programming, and the corresponding fiber orientation angles are derived by minimizing the error of the optimized parameters and possible sets of discrete fiber orientation angles. Numerical examples show various applications of optimization in vibration behaviors of laminated plates, including the maximum fundamental frequencies with corresponding optimum lay-ups (fiber orientation angles) and the maximum difference of the fundamental and second natural frequencies., The Japan Society of Mechanical Engineers, Japanese

CFRP/CFRTPの界面制御、成形加工技術と部材応用
技術情報協会, 第5節 刺繍機と電着樹脂含浸法を用いた成形技術
技術情報協会, Dec. 2020, 9784861048111, 586p, Japanese, [Contributor]