研究者詳細 - 石原　大輔

論文 - 石原　大輔

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Parallel multi-steps strong coupling method for interaction of incompressible viscous fluid and an elastic body 査読有り

Ishihara D., Yoshimura S., Yagawa G.

Computational Fluid and Solid Mechanics 2003 1373 - 1376 2003年06月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2003 Elsevier Science Ltd. All rights reserved. This paper describes a parallel strong coupling method for interaction of incompressible viscous fluid and an elastic body. The method is based on a multi-steps strong coupling method proposed by authors, which can employ a conjugate gradient (CG) method to solve the simultaneous equation system. Using the domain decomposition method with the element-by-element approach, the CG algorithm in the method is parallelized. To demonstrate the accuracy and parallel efficiency of the method, it is applied to the problem of vibrating behavior of an impacted cantilever beam in water. The method is implemented on PC-cluster system. The accuracy of the result and parallel efficiency are discussed.

DOI： 10.1016/B978-008044046-0.50336-5

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Design window search using continuous evolutionary algorithm and clustering - Its application to shape design of microelectrostatic actuator 査読有り

Ishihara D., Jeong M., Yoshimura S., Yagawa G.

Computers and Structures 80 ( 31 ) 2469 - 2481 2002年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper describes a search method for multi-dimensional design window (DW), which is defined as an existing area of satisfactory solutions in a design parameter space. The method consists of the following two steps: (1) direct search for satisfactory design solutions using a continuous evolutionary algorithm (CEA) from a wide area of the design parameter space in a robust manner, and (2) identification of a precise structure of DW by clustering the detected satisfactory solutions with a modified K-means algorithm. The CEA is a kind of genetic algorithms modified to deal with continuous variables. The modified K-means clustering algorithm contains an explicit procedure to determine the optimum number of clusters. The proposed DW search method was implemented to an integrated computational aided engineering system for multi-disciplinary structural design developed by the authors, and then the method was applied to shape design of a microelectrostatic actuator for next generation high-density optical memory. A DW consisting of four clusters, i.e. four sub-DWs was obtained, and the features of the representative design solutions of the four sub-DWs were compared with each other in detail, and a final design solution was determined. © 2002 Elsevier Science Ltd. All rights reserved.

DOI： 10.1016/S0045-7949(02)00293-6

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Multi-step strong coupling method for interaction of incompressible viscous flow and an elastic body 査読有り

Ishihara D., Yoshimura S., Yagawa G.

Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B 68 ( 673 ) 2451 - 2459 2002年09月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper describes a multi-step strong coupling method to analyze an equation system of incompressible viscous fluid and an elastic body. The procedure is derived based on the following techniques; (a) sub-structuring, (b) velocity-pressure splitting, and (c) time integration of Newmark's family. Only simultaneous equations with well-defined symmetric matrices are solved in the method. To demonstrate fundamental performance of the method, it is applied to solve an impacted beam in fluid. The result shows good agreement with a previous work.

DOI： 10.1299/kikaib.68.2451

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Multi-steps strong coupling method for interaction of incompressible viscous fluid and an elastic body 査読有り

Daisuke ISHIHARA,Shinobu YOSHIMURA,Genki YAGAWA

Proceedings of Fifth World Congress on Computational Mechanics (http://wccm.tuwien.ac.at/) 2002年07月

Structural design of micro electrostatic acutuator for optical memory using design windows searching method 査読有り

Ishihara D., Jeong M., Yoshimura S., Yagawa G., Kim Y.

2001 International Conference on Modeling and Simulation of Microsystems - MSM 2001 157 - 160 2001年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

For satisfactory design of micromachines, this paper describes a search method for a multi-dimensional design window (DW), which is defined as an area of satisfactory solutions in a feasible design parameter space. The method consists of the following two steps: (1) direct search for satisfactory design solutions using continuous evolutionary algorithm (CEA, a kind of E A), and (2) identification of DWs from the solutions using a modified K-means clustering algorithm. The obtained DWs are expected to give engineers useful information to understand a design problem, and, further, give them new ideas of design. To demonstrate practical performance of the proposed method, it was applied to a shape design of micro electrostatic actuator for optical memory.

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Shape Design of Micro Electrostatic Actuator using Multidimensional Design Windows 査読有り

M.J.Jeong,Y.J.Kim,D.Ishihara,S.Yoshimura,G.Yagawa

Transactions of the KSME 25 ( 11 ) 1796 - 1801 2001年11月

Automated Search for Multidimensional Design Windows Using Continuous Evolutionary Algorithms and Improved K-means Clustering (It's Application to Shape Design of Micro Electrostatic Actuator for Optical Memory) 査読有り

Ishihara D., Jeong M., Yoshimura S., Yagawa G., Komoriya H., Kim Y.

Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C 67 ( 654 ) 460 - 468 2001年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper proposes an automated search method for multidimensional design window (DW), which is defined as an area of satisfactory design solutions in a design parameter space, using both continuous evolutionary algorithms (CEA) and improved K-means clustering. This method consists of two phases: (a) CEA-based search for satisfactory design solutions in an ill-structured design space, and (b) clustering-based identification of DWs from the solutions. To demonstrate practical performance of the method, it is applied to an automated structural design of micro electrostatic actuator for optical memory. © 2001, The Japan Society of Mechanical Engineers. All rights reserved.

DOI： 10.1299/kikaic.67.460

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Integrated CAE System for Micromachines-It's Application to MicroElectrostatic Actuator for Optical Memory- 査読有り

Daisuke ISHIHARA,Min Joong JEONG,Shinobu YOSHIMURA,Genki YAGAWA,Young Jin KIM

JSST International Conference on Modeling, Control and Computation in Simulation 136 - 141 2000年04月

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