研究者詳細 - 石原　大輔

論文 - 石原　大輔

分割表示188 件中 21 - 40 件目／全件表示 >>

Importance of Three-Dimensional Piezoelectric Coupling Modeling in Quantitative Analysis of Piezoelectric Actuators 査読有り国際誌

Daisuke Ishihara, Prakasha Chigahalli Ramegowda, Shoichi Aikawa, Naoki Iwamaru

CMES - Computer Modeling in Engineering and Sciences ( Tech Science Press ) 136 ( 2 ) 1187 - 1206 2023年02月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper demonstrates the importance of three-dimensional (3-D) piezoelectric coupling in the electromechanical behavior of piezoelectric devices using three-dimensional finite element analyses based on weak and strong coupling models for a thin cantilevered piezoelectric bimorph actuator. It is found that there is a significant difference between the strong and weak coupling solutions given by coupling direct and inverse piezoelectric effects (i.e., piezoelectric coupling effect). In addition, there is significant longitudinal bending caused by the constraint of the inverse piezoelectric effect in the width direction at the fixed end (i.e., 3-D effect). Hence, modeling of these effects or 3-D piezoelectric coupling modeling is an electromechanical basis for the piezoelectric devices, which contributes to the accurate prediction of their behavior.

DOI： 10.32604/cmes.2023.024614

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85148238341&origin=inward

Iterative design window search for polymer micromachined flapping-wing nano air vehicles using nonlinear dynamic analysis 査読有り国際誌

Rashmikant, Daisuke Ishihara

International Journal of Mechanics and Materials in Design ( Springer Science and Business Media B.V. ) 19 ( 2 ) 407 - 429 2023年01月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

In this study, an iterative design window (DW) search using nonlinear dynamic simulation was proposed for polymer micromachined flapping-wing nano air vehicles (FWNAVs) that can satisfy both nonlinear and unsteady design requirements, which are contradictory to each other. The DW is defined as an existing area of satisfactory solutions in the design parameter space. The present FWNAVs have a complete 2.5-dimensional structure such that they can be fabricated using polymer micromachining. The micro-wing of our FWNAVs has been designed using morphological and kinematic parameters of an actual dipteran insect. Finally, using our method, we found the DW that allowed miniaturization of the design down to 10 mm while satisfying all the design requirements. Our findings demonstrate the possibility of further miniaturizing FWNAVs down to the size of small flying insects.

DOI： 10.1007/s10999-022-09635-4

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85145502753&origin=inward

Computational control for strongly coupled structure, electric, and fluid systems 査読有り国際誌

Shankar V., Ramegowda P.C., Ishihara D.

International Journal for Computational Methods in Engineering Science and Mechanics 24 ( 2 ) 91 - 106 2023年01月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Piezoelectric-structure interaction (PSI) and fluid-structure interaction (FSI) are multi-physics coupled systems. These interactions affect the vibration characteristics of coupled systems and thus such complex coupled systems must be controlled. This paper proposes computational control based on the finite element method for strongly coupled multi-physics analysis of the PSI of a thin flexible piezoelectric bimorph actuator. The vibration characteristics and the effect of direct velocity and displacement feedback (DVDFB) control in coupled systems are investigated. The displacement and velocity feedback gains are used together as well as separately. DVDFB control is extended to the FSI of stiff and soft structures to study vibration characteristics using active control and compare the stability of the two types of structure. The results of PSI show a reduction in actuator displacement amplitude and a shift in the resonance frequency due to DVDFB control. For FSI, the results for a stiff material show a reduction in displacement. The velocity feedback gain has no effect for a stiff material and leads to instability due to a large control force. The results for a soft material show a reduction in displacement and amplitude and more stability compared to the case for the stiff material.

DOI： 10.1080/15502287.2022.2066032

Kyutacar

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85132653134&origin=inward

圧電-逆圧電-構造連成現象の動解析における分離反復型解法の収束特性

日浦巧稀, 岩丸直樹, 相川昇壱, 石原大輔

計算力学講演会講演論文集 ( 一般社団法人日本機械学会 ) 2023.36 ( 0 ) OS-0202 2023年01月

担当区分：最終著者,　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）

<p>In a micro piezoelectric drive system for insect-mimetic flapping wing nano air vehicles, a small translational displacement of the piezoelectric bimorph is converted to a large angular displacement using a transmission based on the geometric nonlinearity of large bending of the elastic hinges. The piezoelectric bimorph and the transmission strongly interact with each other due to the scale effect. Furthermore, in the piezoelectric bimorph, the direct and inverse piezoelectric effects are coupled with each other. Hence, in the micro piezoelectric drive system, the direct-piezoelectric, inverse-piezoelectric, and structural coupling occurs. In this study, a finite element analysis method based on the block successive under-relaxation method is proposed for the dynamic analysis of this triply coupled phenomena, and the dependency of the convergence property on the relaxation coefficient is investigated.</p>

DOI： 10.1299/jsmecmd.2023.36.os-0202

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/jsmecmd/2023.36/0/2023.36_OS-0202/_pdf

Accurate finite element modeling of multilayered flexible piezoelectric energy harvesting devices with strong coupling of structure, piezoelectricity, and circuit 査読有り国際誌

Ramegowda P.C., Ishihara D.

International Journal for Computational Methods in Engineering Science and Mechanics ( Informa UK Limited ) 25 ( 3 ) 137 - 151 2023年01月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Multilayered flexible piezoelectric energy harvesting devices (FPEDs) are a new future harvesting technology which are highly flexible and lightweight than familiar cantilever piezoelectric energy harvesters. This mechanical vibration driven FPED is a strongly coupled multiphysics phenomena that involve complex natural three-way interaction among the composite piezoelectric structure, the electric charge accumulated in the piezoelectric material, and a controlling electrical circuit attached to it. Efficient and accurate computational solution approaches are essential for analyzing these mechanical vibration-driven FPEDs to capture the main physical aspect of the coupled phenomena and to accurately predict the output voltage. While there are some numerical models for simple familiar cantilever type piezoelectric energy harvester reported in the literature, a fully three-dimensional strongly coupled model for complex material distributed, complex geometry, and multilayered FPED involving strong coupling of structure, piezoelectricity, and circuit phenomena has not yet been developed. A partitioned iterative algorithm is developed using a hierarchical decomposition approach wherein the coupled three fields are solved separately and coupled through loop union integration techniques that provide an efficient and accurate simulation of FPEDs. The simulation results matched the experiment results very well. This study provides a basis for the natural extension of partitioned iterative finite element coupled algorithm to simulate the future piezoelectric energy harvesting technologies involving a strong coupling of structure, piezoelectricity, and circuit phenomenon.

DOI： 10.1080/15502287.2023.2291013

Kyutacar

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85179949943&origin=inward

Computational evaluation of flight performance of flapping-wing nano air vehicles using hierarchical coupling of nonlinear dynamic and fluid-structure interaction analyses 査読有り国際誌

Rashmikant , Onishi M., Sugikawa K., Ishihara D.

Engineering Applications of Computational Fluid Mechanics 17 ( 1 ) 2023年01月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

This study endeavours to introduce an inventive hierarchical coupling methodology for evaluating the flight capabilities of polymer micromachined flapping-wing nano air vehicles (FWNAVs) using advanced computational tools. Furthermore, our objective is to provide a practical demonstration of FWNAVs in both tethered and airborne scenarios. These dual objectives represent the distinctive and pioneering aspects of this research. Such FWNAVs, which are insect-inspired robots, have a 2.5-dimensional structure. An FWNAV comprises a micro piezoelectric drive system and a pair of micro thin flexible wings. The drive system includes a micro transmission and a piezoelectric bimorph actuator. The flight performance of the designed FWNAV is evaluated using a hierarchical coupling approach, where the whole system is decomposed into a micro wing and a micro piezoelectric drive system. The coupling between these parts is modelled as one-way coupling and that between the micro wings and the surrounding air is modelled as strong coupling. In the one-way coupling analysis, nonlinear structural dynamic analysis is conducted for the micro piezoelectric drive system, where the dynamic response is transmitted to the micro wings via the Dirichlet boundary condition. In the strong coupling analysis, strongly coupled fluid-structure interaction analysis is conducted for the micro wings and the surrounding air to consider their strong coupling. The optimisation of flight performance is conducted using fluid-structure interaction analysis to achieve sufficient lift force to support the weight of an FWNAV. The design of a tethered and flyable FWNAV with a size of 10 mm or smaller is demonstrated. This FWNAV can be easily fabricated using polymer micromachining.

DOI： 10.1080/19942060.2023.2271053

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85175859587&origin=inward

ポリマーマイクロマシニングによる昆虫規範型マイクロ弾性翼の作製可能解

白川和, ヴィナイシャンカー, 木村元宣, 石原大輔

バイオフロンティア講演会講演論文集 ( 一般社団法人日本機械学会 ) 2023.34 ( 0 ) 1F10 2023年01月

Numerical Analysis of Insect Flight Maneuverability Using Feedback Control Model 査読有り国際誌

石原大輔

Proceedings of the 42th JSST Annual International Conference on Simulation Technology - 155 - 158 2023年01月

ポリマー微細加工された昆虫規範型羽ばたき装置による微小翼の共振駆動

石破和弥, 末次亮太郎, 木村元宣, 大西南斗, 石原大輔

第13回マイクロ・ナノ工学シンポジウム予稿集 2022年11月

ポリマー微細加工による多層中空構造を用いた昆虫規範型飛行体用トランスミッション

木村元宣, 末次亮太郎, 上尾純平, 石原大輔

第13回マイクロ・ナノ工学シンポジウム予稿集 2022年11月

昆虫飛行操縦性における流体-翼-胴体連成のフィードバック制御付き分離型解法

大西南斗, 石原大輔

計算力学講演会講演論文集 ( 一般社団法人日本機械学会 ) 2022年11月

流体中で振動する圧電バイモルフにおける流体-構造-圧電-回路連成現象の分離反復型解法

三笘征弘, 野崎駿之介, 石原大輔

計算力学講演会講演論文集 ( 一般社団法人日本機械学会 ) 2022年11月

マイクロ圧電駆動システムの圧電-逆圧電-構造連成現象に対する分離反復型解法

岩丸直樹, 相川昇壱, 大西南斗, 石原大輔

計算力学講演会講演論文集 ( 一般社団法人日本機械学会 ) 2022年11月

ミクロスケール接触変形・電流連成解析による接触電気抵抗特性の基礎的検討

二保知也, 石原大輔

計算力学講演会講演論文集 ( 一般社団法人日本機械学会 ) 2022年11月

Fluid-structure interaction design of the polymer micromachined insect-inspired flapping wings 査読有り

Vinay Shankar, Minato Onishi, Daisuke Ishihara