研究者詳細 - 石原　大輔

論文 - 石原　大輔

分割表示188 件中 141 - 160 件目／全件表示 >>

Hierarchal decomposition for the structure-fluid-electrostatic interaction in a microelectromechanical system 査読有り

Ishihara D., Horie T., Niho T., Baba A.

CMES - Computer Modeling in Engineering and Sciences 108 ( 6 ) 429 - 452 2015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）

Copyright © 2015 Tech Science Press. In this study, a hierarchal decomposition is proposed to solve the structure- fluid-electrostatic interaction in a microelectromechanical system (MEMS). In the proposed decomposition, the structure-fluid-electrostatic interaction is partitioned into the structure-fluid interaction and the electrostatic field using the iteratively staggered method, and the structure-fluid interaction is split into the structurefluid velocity field and the fluid pressure field using the projection method. The proposed decomposition is applied to a micro cantilever beam actuated by the electrostatic force in air. It follows from the comparisons among the numerical and experimental results that the proposed method can predict the MEMS vibration characteristics accurately.

Kyutacar

Scopus

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258 昆虫羽ばたき翼の受動的ピッチングに対する流体構造連成解析

石原大輔, 堀江知義, 二保知也

計算力学講演会講演論文集 ( 一般社団法人日本機械学会 ) 2015 ( 0 ) _258 - 1_-_258-2_ 2015年01月

30pm1-E-5 昆虫模倣翼のMEMSプロセスによる試作とその性能評価

荒木政輝, 石原大輔, 村上直, 堀江知義

マイクロ・ナノ工学シンポジウム ( 一般社団法人日本機械学会 ) 2015 ( 0 ) _30pm1 - E-5-_30pm1-E-5 2015年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（その他学術会議資料等）

In recent years, Micro Air Vehicles (MAVs) mimicking insects have been developed for the purpose of observation in narrow and disaster areas. Micro Electro Mechanical Systems (MEMS) are typically manufactured using the semiconductor manufacturing technology, and have attracted much attention in various fields. In this study, in order to realize an insect-like MAV, its prototype millimeter wing is developed. The prototype wing is designed based on the mechanics of insect flapping wings and the data of an actual insect. The prototype wing made of a single crystal silicon and a polyimide membrane is fabricated, and its fundamental characteristics are evaluated.

DOI： 10.1299/jsmemnm.2015.7._30pm1-E-5

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/110010046076

OS1-5 Fluid-structure interaction analysis for the aerodynamic contribution to the passive pitching motion of dipteran flapping wings(OS1: Bio-inspired Flight System Biomechanics I) 招待有り査読有り

Ishihara Daisuke, Horie Tomoyoshi, Niho Tomoya

Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics ( 一般社団法人日本機械学会 ) 2015 ( 0 ) 2015年01月

An experimental and three-dimensional computational study on the aerodynamic contribution to the passive pitching motion of flapping wings in hovering flies 査読有り

Ishihara D., Horie T., Niho T.

Bioinspiration and Biomimetics 9 ( 4 ) 2014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）

© 2014 IOP Publishing Ltd.The relative importance of the wing's inertial and aerodynamic forces is the key to revealing how the kinematical characteristics of the passive pitching motion of insect flapping wings are generated, which is still unclear irrespective of its importance in the design of insect-like micro air vehicles. Therefore, we investigate three species of flies in order to reveal this, using a novel fluid-structure interaction analysis that consists of a dynamically scaled experiment and a three-dimensional finite element analysis. In the experiment, the dynamic similarity between the lumped torsional flexibility model as a first approximation of the dipteran wing and the actual insect is measured by the Reynolds number Re, the Strouhal number St, the mass ratio M, and the Cauchy number Ch. In the computation, the three-dimension is important in order to simulate the stable leading edge vortex and lift force in the present Re regime over 254. The drawback of the present experiment is the difficulty in satisfying the condition of M due to the limitation of available solid materials. The novelty of the present analysis is to complement this drawback using the computation. We analyze the following two cases: (a) The equilibrium between the wing's elastic and fluid forces is dynamically similar to that of the actual insect, while the wing's inertial force can be ignored. (b) All forces are dynamically similar to those of the actual insect. From the comparison between the results of cases (a) and (b), we evaluate the contributions of the equilibrium between the aerodynamic and the wing's elastic forces and the wing's inertial force to the passive pitching motion as 80-90% and 10-20%, respectively. It follows from these results that the dipteran passive pitching motion will be based on the equilibrium between the wing's elastic and aerodynamic forces, while it will be enhanced by the wing's inertial force.

DOI： 10.1088/1748-3182/9/4/046009

Scopus

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流体構造連成相似則に基づく昆虫羽ばたき翼の解析

石原大輔,堀江知義,二保知也

日本実験力学会2014年度年次講演会論文集講演論文集 14 7 - 8 2014年08月

MEMS構造要素の振動解析における入力データと連成効果の同定

石原大輔, 堀江知義, 二保知也, 馬場昭好

第19回計算工学講演会論文集 19 D-11-4, 2pages 2014年06月

空気中で静電駆動されるマイクロ片持ちはりにおける連成効果

石原大輔,堀江知義,二保知也,馬場昭好

第26回電磁力関連のダイナミクスシンポジウム講演論文集 28 - 29 2014年05月

昆虫羽ばたき翼の受動的ピッチング動力学における空気力効果の数値的検討査読有り

石原大輔, 堀江知義, 二保知也

日本機械学会論文集 ( 一般社団法人日本機械学会 ) 80 ( 812 ) CM0106 - CM0106 2014年01月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

This study is concerned with aerodynamic effects in passive pitching dynamics of insect flapping wings, which would be based on the Fluid-Structure Interaction (FSI). Thus, we evaluated them using three-dimensional numerical analyses for the FSI based on the finite element method. In the numerical analyses, the FSI in insect flapping wing is broken down into its constituent components in order to find the aerodynamic effects in the passive pitching dynamics as follows: (a) The dipteran passive pitching dynamics is based on the interaction between the wing's elastic and aerodynamic forces, while it is enhanced by the wing's inertial effect. (b) The air damping leads the mode of wing's natural vibration from underdamping to overdamping so as to form the characteristic pitching motion, where the damped natural vibration of the wing appears so as to enhance the wing rotation.

DOI： 10.1299/transjsme.2014cm0106

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130003399154

相補完的な計算と相似模型実験を用いた流体構造連成シミュレーション

石原大輔, 堀江知義, 二保知也

理論応用力学講演会講演論文集 ( 日本学術会議「機械工学委員会・土木工学・建築学委員会合同IUTAM分科会」 ) 63 ( 0 ) 2014年01月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（その他学術会議資料等）

流体と構造が強く連成する現象に対する信頼性の高い解析手法が求められている．相似模型実験は，鍵となる無次元数の増加に伴い，それらの条件を同時に満たすことが難しくなる．一方，計算は，近年，急速に発展しているが，現象の複雑化に伴い，一層，結果の妥当性を検討することが求められる．そこで本研究においては，計算と相似模型実験の相補完による流体構造連成シミュレーションを提案し，具体的な流体構造連成現象として，昆虫羽ばたき飛行を取り上げて，その有効性を検討する．

DOI： 10.11345/japannctam.63.0_83

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130005478028

流体構造連成相似実験の計算による補完と昆虫飛行解析への適用

石原大輔, 堀江知義, 二保知也

計算力学講演会講演論文集 ( 一般社団法人日本機械学会 ) 2014 ( 0 ) 403 - 404 2014年01月

A projection method for the monolithic interaction system of an incompressible fluid and a structure using a new algebraic splitting 査読有り

Ishihara D., Horie T.

CMES - Computer Modeling in Engineering and Sciences 101 ( 6 ) 421 - 440 2014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）

Copyright © 2014 Tech Science Press. In this study, a projection method for the monolithic interaction system of an incompressible fluid and a structure using a new algebraic splitting is proposed. The proposed method splits the monolithic equation system into the equilibrium equations and the pressure Poisson equation (PPE) algebraically using the intermediate velocity in the nonlinear iterations. Since the proposed equilibrium equation satisfies the interface condition, the proposed method is strongly coupled. Moreover, the proposed PPE enforces the incompressibility constraint. Different from previous studies, the proposed algebraic splitting never generates any Schur complement. The proposed method is applied to a channel with a flexible flap, which is one of typical test problems, where its superior computational efficiencies are demonstrated.

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84919969728&origin=inward

J0220401 昆虫羽ばたき翼の受動的ピッチング運動における空気減衰の数値的検討([J022-04]生物規範メカニクス・システム:生物の運動、力学及びミメティクスセッション(4))

石原大輔, 堀江知義

年次大会 ( 一般社団法人日本機械学会 ) 2014 ( 0 ) _J0220401 - -_J0220401- 2014年01月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（その他学術会議資料等）

This study is concerned with air damping effect in passive pitching motion of insect flapping wing, which will be based on the Fluid-Structure Interaction (FSI). Thus, we evaluated it using three-dimensional numerical analyses for the FSI based on the finite element method. From the numerical analysis, we found that the air damping leads the mode of wing's natural vibration from underdamping to overdamping so as to form the characteristic pitching motion.

DOI： 10.1299/jsmemecj.2014._J0220401-

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/110009943479

Convergence evaluation on a projection method for the interaction of an incompressible fluid and an elastic structure 査読有り

Ishihara D., Horie T.

Transactions of the Japan Society for Computational Engineering and Science ( 一般社団法人日本計算工学会 ) 2013 ( 0 ) 20130017 - 20130017 2013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）

In this study, performances of a projection method for the interaction system of an incompressible fluid and a flexible elastic structure are evaluated. The proposed projection method splits the monolithic equation system into the equilibrium equations and the pressure Poisson equation (PPE) using the intermediate velocity in the nonlinear iterative procedure. The monolithic equation system has the drawbacks of the large degrees of freedoms and the ill-condition. The proposed formulation reduces these drawbacks. The performance of the proposed projection method is demonstrated using a channel with a flexible flap, which is one of typical test problems, and a flapping flexible wing in a closed tank with comparable fluid and structural mass densities. It follows from the results for these numerical examples that the proposed projection method is efficient for the cases, where some conventional monolithic and partitioned methods would suffer the numerical difficulties. © 2013 by the Japan Society for Computational Engineering and Science.

DOI： 10.11421/jsces.2013.20130017

Scopus

CiNii Article

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84891934466&origin=inward

A consistent projection method for monolithic fluid-structure interaction systems 査読有り

Daisuke Ishihara, Tomoyoshi Horie

Proceedings of Computational Methods for Coupled Problems in Science and Engineering V (COUPLED PROBLEMS 2013) (CD-ROM) 2013年06月

Finite element analysis using hierarchal decomposition for interaction of structural, fluidic and electrostatic fields in MEMS structural components 査読有り

Ishihara D., Horie T., Niho T., Baba A.

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A ( 一般社団法人日本機械学会 ) 79 ( 804 ) 1291 - 1302 2013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）

In this study a finite element analysis using hierarchal decompositions for the interaction of structural, fluidic and electrostatic fields is applied for vibration analyses of a MEMS structural component. The interaction is partitioned into the electrostatic field and the fluid-structure interaction (FSI) using the block Gauss-Seidel method. The FSI is split into the pressure field and the other using a projection method, where the intermediate state variables are used for the splitting without generating computationally expensive Schur complement matrices. The developed finite element analysis is applied for a micro cantilever beam actuated by the step electrostatic force in vacuum and air. It was demonstrated from the comparisons among the numerical and experimental results that the proposed analyses provide the results consistent with the experimental results. It follows from the present results that the numerical analyses taking into account the interaction of the structural, fluidic and electrostatic fields are required for the accurate predictions of the vibration characteristics of the MEMS structural components. © 2013 The Japan Society of Mechanical Engineers.

DOI： 10.1299/kikaia.79.1291

Scopus

CiNii Article

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84885225030&origin=inward

Consistent projection method for fluid-structure interaction 査読有り

Ishihara D., Horie T.

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A ( 一般社団法人日本機械学会 ) 79 ( 804 ) 1161 - 1170 2013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）

In this study a consistent projection method for the fluid-structure interaction (FSI) was proposed. The intermediate state variables were used to split the monolithic equation system into the equilibrium equations and the pressure Poisson equation (PPE). The incompressibility constraint is asymptotically satisfied by solving the proposed PPE in the iterative solution procedure under the asymptotic agreement of the intermediate velocity with the velocity. Therefore the proposed method is consistent with the monolithic method. The performance of the present method was demonstrated using a channel, which is one of typical test problems, and a flexible wing flapping in the closed fluid domain with the comparable fluid and structural densities. © 2013 The Japan Society of Mechanical Engineers.

DOI： 10.1299/kikaia.79.1161

Scopus

CiNii Article

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84885219667&origin=inward

Finite element analysis for interaction problems of structure, fluid and electrostatic field in micro cantilever beams 招待有り査読有り

Daisuke Ishihara, Tomoyoshi Horie, Tomoya Niho, Akiyoshi Baba

Proceedings of KSME-JSME Joint Symposium on CM & CAE 2012 255 - 260 2012年09月

流体構造連成によって生じるハエ目の受動的ピッチング運動の動力学的相似実験による評価（共著）査読有り

石原大輔, 吉田翔太郎, 志村高規, 堀江知義, 二保知也

日本機械学会論文集B編 78 ( 786 ) 300 - 310 2012年02月

MEMSにおける構造‐流体‐静電界連成現象の汎用連成シミュレーション手法の開発招待有り

石原大輔,馬場昭好

財団法人カシオ科学振興財団平成２２年度年報 2 - 80-81 2010年08月

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