研究者詳細 - 石原　大輔

論文 - 石原　大輔

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連成解析・連携解析招待有り

山田知典, 澤田有弘, 石原大輔

計算工学 ( 日本計算工学会 ) 27 ( 3 ) 4014 (8) - 4015 (8) 2022年08月

圧電エネルギーハーベスティングにおける構造－圧電－回路連成現象の分離型-一体型ハイブリッド強連成解法の提案

野崎隼之介, 石原大輔, 二保知也

計算工学講演会論文集 2022年06月

2.5-dimensional insect-mimetic wing model for flapping wing nano air vehicles and design window search for manufacturable solutions using polymer micromachining 査読有り国際誌

Shankar V., Matsuo R., Onishi M., Ishihara D.

17th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2022 306 - 311 2022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（国際会議プロシーディングス）

Insect flapping wings undergo large deformations such as feathering and cambering for creating large thrust forces. Hence, insect-mimetic wings for flapping wing nano air vehicles (FWNAVs) will replicate these characteristic deformations. For the purpose of realizing this type of wings, in this study, a 2.5-dimensional (2.5-D) insect-mimetic wing model for FWNAVs is proposed. The proposed wing model consists of the leading-edge, the central vein, the root vein, and the membrane, all of which are described by shell elements. The feathering and cambering of the proposed wing model can be caused by the aerodynamic pressure. Furthermore, the proposed wing can be fabricated using polymer micromachining because of the complete 2.5-D structure. In order to demonstrate these capabilities, we perform the design window (DW) search. The DW is defined as the existing area of satisfactory design solutions in the design parameter space, where each solution can produce a sufficient camber. The DWs for the leading-edge, the central and root veins are searched continuously using the geometrically nonlinear finite element analysis under quasi-steady aerodynamic modeling. The thickness is chosen as the design parameter, while the other parameters are set following actual insects and polymer materials. Finally, we determine the final solutions from the DWs for a specific polymer micromachining technique. In our future work, the proposed solutions will be manufactured for the future miniaturization of FWNAVs.

DOI： 10.1109/NEMS54180.2022.9791094

Kyutacar

Scopus

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Computational Approach for the Fluid-Structure Interaction Design of Insect-Inspired Micro Flapping Wings 査読有り国際誌

Ishihara D.

Fluids 7 ( 1 ) 2022年01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）

A flight device for insect-inspired flapping wing nano air vehicles (FWNAVs), which consists of the micro wings, the actuator, and the transmission, can use the fluid-structure interaction (FSI) to create the characteristic motions of the flapping wings. This design will be essential for further miniaturization of FWNAVs, since it will reduce the mechanical and electrical complexities of the flight device. Computational approaches will be necessary for this biomimetic concept because of the complexity of the FSI. Hence, in this study, a computational approach for the FSI design of insect-inspired micro flapping wings is proposed. This approach consists of a direct numerical modeling of the strongly coupled FSI, the dynamic similarity framework, and the design window (DW) search. The present numerical examples demonstrated that the dynamic similarity framework works well to make different two FSI systems with the strong coupling dynamically similar to each other, and this framework works as the guideline for the systematic investigation of the effect of characteristic parameters on the FSI system. Finally, an insect-inspired micro flapping wing with the 2.5-dimensional structure was designed using the proposed approach such that it can create the lift sufficient to support the weight of small insects. The existing area of satisfactory design solutions or the DW increases the fabricability of this wing using micromachining techniques based on the photolithography in the micro-electro-mechanical systems (MEMS) technology. Hence, the proposed approach will contribute to the further miniaturization of FWNAVs.

DOI： 10.3390/fluids7010026

Scopus

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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 ) 2022.35 ( 0 ) 12-07 2022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>This study proposed a partitioned method with a feedback control to analyzed maneuvering of insects during flapping flight. This method decomposed the insect flapping flight into wing and body subsystems and then coupled them using feedback control. In the wing subsystem, the strong coupling of the flexible wings and surrounding fluid was accurately analyzed using the finite element method to obtain the thrust forces acting on the insect’s body. The resulting thrust forces were passed from the wing subsystem to the body subsystem, and then rigid body motion was analyzed in the body subsystem. The controlling of wing subsystem is done by the feedback control using the body angular displacement and velocity. The fundamental performance of the proposed method is demonstrated from the comparison between the present results and the actual observation of maneuver.</p>

DOI： 10.1299/jsmecmd.2022.35.12-07

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/jsmecmd/2022.35/0/2022.35_12-07/_pdf

One-wing polymer micromachined transmission for insect-inspired flapping wing nano air vehicles 査読有り

Rashmikant , Ishihara D., Suetsugu R., Ramegowda P.C.

Engineering Research Express 3 ( 4 ) 2021年12月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper presents a feasibility step in the development of an insect-inspired flapping wing nano air vehicle using advanced engineering technologies such as microelectromechanical systems (MEMS) technologies. To develop an insect-inspired flapping wing nano air vehicle, a one-wing polymer micromachined transmission is proposed in this paper. The novelty of this study includes (1) the use of the geometrically nonlinear bending deformation of a set of two parallel elastic hinges as the basis for the transmission mechanism, which produces a large rotational displacement from a small translational displacement, and (2) a complete 2.5-dimensional structure that can be fabricated using standard microfabrication techniques, including etching, photolithography, deposition, and curing, without any post-assembly. This design is also an improved version of our previous design, a two-wing polymer micromachined transmission. The transmission proposed here has a great advantage over other types of transmission mechanisms, including its low energy loss because no post-assembly is required (reduced friction loss); its low total weight; its capacity to be further miniaturized without difficulty; and its performance, i.e., ability to produce the necessary stroke angle of approximately 30° without resonance assistance.

DOI： 10.1088/2631-8695/ac2bf0

Scopus

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Comparative study on linear and quadratic solid direct-piezoelectric solvers with shell inverse-piezoelectric solver to analyze a thin piezoelectric bimorph device 査読有り

Prakasha Chigahalli Ramegowda, Daisuke Ishihara

Proceedings of the 40th JSST Annual International Conference on Simulation Technology 406 - 409 2021年09月

Importance of 3-D piezoelectric coupled analysis in evaluation of thin piezoelectric bimorph deformation 査読有り

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

Proceedings of the 40th JSST Annual International Conference on Simulation Technology 404 - 405 2021年09月

Comparative study on partitioned iterative algorithms for coupled multiple phenomena in piezoelectric energy harvesters 査読有り

Naoto Takayama, Daisuke Ishihara, Prakasha Chigahalli Ramegowda, Shunsuke Nozaki

Proceedings of the 40th JSST Annual International Conference on Simulation Technology 378 - 379 2021年09月

Passive motions and aerodynamic performance of insect’s flapping wings simulated using the pixel wing model and the strong coupling method 査読有り

Minato Onishi, Daisuke Ishihara

Proceedings of the 40th JSST Annual International Conference on Simulation Technology 374 - 377 2021年09月

Comparative study of strongly coupled fluid and structure systems with computational control 査読有り

Vinay Shankar, Daisuke Ishihara

Proceedings of the 40th JSST Annual International Conference on Simulation Technology 370 - 373 2021年09月

Strongly coupled partitioned iterative method for the structure–piezoelectric–circuit interaction using hierarchical decomposition 査読有り

Ishihara D., Takata R., Ramegowda P.C., Takayama N.

Computers and Structures 253 2021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）

The key to the design of advanced micro electro–mechanical devices is an accurate evaluation of the circuit-integrated piezoelectric oscillator that accounts for its complicated configuration. Here, the direct numerical modeling of this oscillator leads to a general formulation as a structure–piezoelectric–circuit interaction. Hence, this study developed a strongly coupled partitioned iterative method for the structure–piezoelectric–circuit interaction. The proposed method was constructed using hierarchical decomposition, the partitioned iterative method for two coupled fields, and loop union. That is, the whole system of the coupled multiphysics is hierarchically decomposed into coupled two-field subsystems, partitioned iterative algorithms for two coupled fields are applied to these subsystems, and the coupling algorithms for these subsystems are reduced to a single coupling algorithm. In the proposed method, three distinct direct piezoelectric, inverse piezoelectric, and circuit solvers are strongly coupled with each other. The inverse piezoelectric solver uses shell finite elements to analyze the response of the thin oscillator efficiently, while the direct piezoelectric solver uses solid finite elements to accurately describe the three-dimensional distribution of the electric potential in the piezoelectric continuum. The proposed method can accurately analyze coupling phenomena in the RC circuit, piezoelectric shunt damping, and piezoelectric energy harvesting.

DOI： 10.1016/j.compstruc.2021.106572

Scopus

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抵抗スポット溶接における引張せん断強度の接触変形・電流・熱伝導3 連成解析

二保知也, 金城喜己, 石原大輔

計算工学講演会論文集 26 A-11-06 (3pages) 2021年05月

圧電エネルギーハーベスティングの複合・階層的な構造–圧電–電気回路連成現象に対する分離反復型解法の比較検討

高山直人, 石原大輔, プラカシャチガハリラメゴウダ, 野崎隼之介

計算工学講演会論文集 26 A-11-03 (4pages) 2021年05月

圧電バイモルフ変形評価における３次元圧電-逆圧電連成解析の重要性

相川昇壱, 石原大輔, 岩丸直樹, プラカシャチガハリラメゴウダ

計算工学講演会論文集 26 A-11-02 (3pages) 2021年05月

昆虫羽ばたき翼に生じる受動的キャンバーのピクセル翼モデルによる流体構造連成解析

大西南斗, 石原大輔

計算工学講演会論文集 26 A-10-02 (3pages) 2021年05月

Improved Design of Polymer Micromachined Transmission for Flapping Wing Nano Air Vehicle 査読有り国際誌

Rashmikant , Ishihara D., Suetsugu R., Murakami S., Ramegowda P.C.

Proceedings of the 16th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2021 1320 - 1325 2021年04月

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

This paper presents an improved design of polymer micromachined transmission for flapping-wing Nano Air Vehicles (FWNAVs) in comparison with our last design. Design Improvement includes (1) reduction of the crack and fracture during microfabrication, and (2) performance improvement of the transmission. The novelty of our polymer micromachined transmission includes (1) the transmission mechanism based on the geometrical nonlinear bending deformation, and (2) the complete 2.5-dimensional structure that can be fabricated using standard microfabrication techniques including the etching, the photolithography, the deposition, and the curing process. The complete 2.5-dimensional structure requires no post-assembly and leads to further miniaturization without so much difficulty. Each wing of FWNAVs will be driven by the proposed transmission and actuator separately. The present transmission can produce around 40° stroke angle, which is about 50% higher than that of our previous work without considering the mass effect.

DOI： 10.1109/NEMS51815.2021.9451440

Kyutacar

Scopus

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Hierarchical modeling and finite element analysis of piezoelectric energy harvester from structure-piezoelectric-circuit interaction 査読有り

Ramegowda P.C., Ishihara D., Takata R., Horie T.

World Congress in Computational Mechanics and ECCOMAS Congress 1200 2021年01月

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）

The piezoelectric energy harvesting devices for the conversion of mechanical vibration into electric energy via a flexible piezoelectric energy harvesting (FPED) structure have gained greater attention. Here, the large deformation of the FPED structure causes a strong interaction with the electric field (direct-piezoelectric effect) and structural field (inverse-piezoelectric effect), and vice-versa. Also an electrical circuit is attached to the electrodes covering the piezoelectric layers. This becomes a three-way coupling of the structure, the electromechanical effect of the piezoelectric material, and the electrical circuit. A mathematical and numerical model of the complex physical system of the involved multiphysics coupling characteristics in order to predict the operational properties and to increase the performance is very important. The presentation will discuss a partitioned coupling algorithm based hierarchical decomposition using finite element method for piezoelectric energy harvesting from structure-piezoelectric-circuit interaction. Results obtained with the finite element analysis are compared with the experimental results of PEHDs with base excitation reported in the literature.

DOI： 10.23967/wccm-eccomas.2020.163

Scopus

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Triply coupled analysis method for thin flexible piezoelectric bimorph in fluid 査読有り国際誌

Ramegowda P.C., Ishihara D., Takata R., Niho T., Horie T.

8th International Conference on Computational Methods for Coupled Problems in Science and Engineering, COUPLED PROBLEMS 2019 470 - 480 2021年01月

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

Piezoelectric-structure-fluid interaction is a complex multiphysics coupled phenomena appears wherein piezoelectric devices are in contact or surrounded by the fluid media. The piezoelectric energy harvesting using ocean waves, wind flow, and mechanical vibrations are some of the popular energy savaging methods wherein thin piezoelectric bimorphs surrounded by the fluid is used for power harvesting. With recent advances on micro air vehicles actuated by piezoelectric bimorph actuators in the fluid (surrounding media) as attracted the of piezoelectric-structure-fluid interaction. Generally, in these applications, the piezoelectric bimorph is thin, flexible, and surrounded by the fluid. The large deformation of the thin flexible piezoelectric bimorph causes strong interaction with the electric field (piezoelectric effect) and the surrounding fluid, and inversely, these two fields significantly affect the structure. The piezoelectric field-structure-fluid interaction analysis is very significant. In this work, we propose a hierarchal decomposition method to solve piezoelectric-structure-fluid interaction of a piezoelectric bimorph in the fluid. The proposed method is applied to a flexible restrictor flap in converging channel, where the rubber flap is replaced by the piezoelectric bimorphs made of PVDF or PZT-5H. The resonance frequency of the piezoelectric bimorph in the fluid agrees well with the theoretical and numerical pure FSI cases. These results show a good agreement with the previous studies.

Scopus

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Coupled solid piezoelectric and shell inverse-piezoelectric analysis using partitioned method for thin piezoelectric bimorph with metal layers 査読有り国際誌

Ishihara D., Ramegowda P.C., Takata R., Niho T., Horie T.

8th International Conference on Computational Methods for Coupled Problems in Science and Engineering, COUPLED PROBLEMS 2019 451 - 457 2021年01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（国際会議プロシーディングス）

In this study, the coupled solid piezoelectric and shell inverse-piezoelectric analysis method for a thin piezoelectric bimorph with metal layers is proposed. The piezoelectric bimorph is usually thin and includes the metal layers such as the electrode and the shim plate. In the proposed method, the solid and shell elements are used for the piezoelectric and inverse-piezoelectric analyses, respectively, since the solid elements can describe the various types of the distributions of the electric potential along the thickness, and the shell elements are suitable for analyzing the thin structure. The block Gauss-Seidel method is used to couple the solid piezoelectric and shell inverse-piezoelectric analyses. In the iterative passing of the solution variables, the transformation method is used between the solid and shell elements. The rules of mixture for the bending rigidity and the mass are used for modeling the single shell structure in the inverse-piezoelectric analysis. A pseudo-piezoelectric modeling for the conductor is proposed to consider the metal layers in the piezoelectric analysis. This modeling allows us to reuse existing programs of the piezoelectric analysis without any modification.

Scopus

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