研究者詳細 - 石原　大輔

論文 - 石原　大輔

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共振駆動される昆虫模倣ＭＥＭＳ飛行体の弾性翼構造最適化による羽ばたき飛行性能向上

白川和，西ノ原琉世, 石原大輔

日本機械学会第15回マイクロ・ナノ工学シンポジウム予稿集〔2024.11.25－28，仙台〕 2024年11月

昆虫飛行操縦性の流体-構造-制御連成解析手法

杉川楓, 石原大輔

計算力学講演会講演論文集[No.-] 日本機械学会第 37回計算力学講演会（CMD2024） ( 一般社団法人日本機械学会 ) OS-0202 2024年10月

Computational study on vibration characteristics of fluid-structure-piezoelectric-circuit interaction in piezoelectric energy harvesters in fluid 査読有り

Koki Hiura, Daisuke Ishihara

Proceedings of the 43rd JSST Annual International Conference on Simulation Technology 232 - 236 2024年09月

Computational FSI Modeling of Insect Flapping Wings 査読有り

Daisuke Ishihara

Proceedings of the 43rd JSST Annual International Conference on Simulation Technology 237 - 242 2024年09月

昆虫規範型微小羽ばたき翼の駆動条件最適化による飛行性能向上

白川和, Shankar Vinay, 木村元宣, 石原大輔

日本機械学会第36 回バイオエンジニアリング講演会抄録集 2P40 2024年05月

昆虫規範型微小羽ばたき翼の流体構造連成設計招待有り

石原大輔

計算工学 29 ( 2 ) 7 - 10 2024年04月

生物の飛行と遊泳における計算バイオミメティクス招待有り

石原大輔

計算工学 29 ( 2 ) 2 - 2 2024年04月

Novel Computational Design of Polymer Micromachined Insect-Mimetic Wings for Flapping-Wing Nano Air Vehicles 査読有り国際誌

Shankar V., Shirakawa N., Ishihara D.

Biomimetics ( MDPI AG ) 9 ( 3 ) 133 - 133 2024年03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）

The flapping wings of insects undergo large deformations caused by aerodynamic forces, resulting in cambering. Insect-mimetic micro wings for flapping-wing nano air vehicles mimic these characteristic deformations. In this study, a 2.5-dimensional insect-mimetic micro wing model for flapping-wing nano air vehicles is proposed to realize this type of wing. The proposed model includes a wing membrane, a leading edge, a center vein, and a root vein, all of which are modeled as shell elements. The proposed wing is a 2.5-dimensional structure and can thus be fabricated using polymer micromachining. We conducted a design window search to demonstrate the capabilities of the wing. The design windows, which are areas of desirable design solutions in the design parameter space, are iteratively searched using nonlinear finite-element analysis under quasi-steady aerodynamic modeling. Here, thickness is selected as a design parameter. The properties of real insects, polymer materials, and fabrication conditions are used to determine the other parameters. A fabricable design solution that generates sufficient camber is found from the design windows.

DOI： 10.3390/biomimetics9030133

Scopus

CiNii Research

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Hybrid Strategy of Partitioned and Monolithic Methods for Solving Strongly Coupled Analysis of Inverse and Direct Piezoelectric and Circuit Coupling 査読有り

Ishihara D., Nozaki S., Niho T., Takayama N.

CMES - Computer Modeling in Engineering and Sciences 140 ( 2 ) 1371 - 1386 2024年01月

担当区分：筆頭著者,　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）

The inverse and direct piezoelectric and circuit coupling are widely observed in advanced electro-mechanical systems such as piezoelectric energy harvesters. Existing strongly coupled analysis methods based on direct numerical modeling for this phenomenon can be classified into partitioned or monolithic formulations. Each formulation has its advantages and disadvantages, and the choice depends on the characteristics of each coupled problem. This study proposes a new option: a coupled analysis strategy that combines the best features of the existing formulations, namely, the hybrid partitioned-monolithic method. The analysis of inverse piezoelectricity and the monolithic analysis of direct piezoelectric and circuit interaction are strongly coupled using a partitioned iterative hierarchical algorithm. In a typical benchmark problem of a piezoelectric energy harvester, this research compares the results from the proposed method to those from the conventional strongly coupled partitioned iterative method, discussing the accuracy, stability, and computational cost. The proposed hybrid concept is effective for coupled multi-physics problems, including various coupling conditions.

DOI： 10.32604/cmes.2024.049694

Scopus

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Numerical analysis of insect flight maneuverability using feedback control model 査読有り国際誌

Sugikawa Kaede, Onishi Minato, Ishihara Daisuke

日本シミュレーション学会英文誌 ( 一般社団法人日本シミュレーション学会 ) 11 ( 1 ) 201 - 206 2024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）

<p>In this study, we propose a new feedback control model for insect flight maneuverability, and conduct the numerical analysis using the proposed model. In the proposed model, the feedback control based on the observation for actual insects is introduced to the partitioned analysis model for the wing-body interaction, where the flapping wings and the surrounding air flow coupling is monolithically formulated using a finite element method such that the wing’s characteristic motions are simulated stably, while the one-way coupling from the wings to the body is used assuming a perturbation from the quasi-steady flight state. The roll control, on which we focus here, in our numerical result shows the good agreement with the body’s attitude control of an actual insect observed in the previous experiment. In our future work, we will elucidate a maneuverability mechanism of controlling body’s attitudes in insect flapping flight using the proposed model.</p>

DOI： 10.15748/jasse.11.201

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/jasse/11/1/11_201/_pdf

Fabricable polymer micromachined insect mimetic wing for pico air vehicles 査読有り国際誌

Shankar V., Shirakawa N., Ishihara D.

2024 IEEE 19th International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2024 2024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）

This paper presents a novel fabricable design and demonstration of a polymer micromachined wing for flapping wing pico air vehicles, which is capable of producing camber deformations similar to those of real insects. The proposed wing is a 2.5-dimensional structure comprised of the leading edge, center, and root veins, and the wing membrane such that it can be fabricated using polymer micromachining. The design window that refers to the area of satisfactory design solutions is iteratively searched using a nonlinear finite element structural analysis. In the design problem, the mean camber is the design characteristic, the thickness of each vein is the design parameter, and the design constraint is the fabricability. A final design solution with sufficient camber is selected from the design window, and the fabricability is demonstrated using polymer micromachining.

DOI： 10.1109/NEMS60219.2024.10639876

Scopus

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Algorithm Selection Method Based on Coupling Strength for Partitioned Analysis of Structure-Piezoelectric-Circuit Coupling 査読有り国際誌

Ishihara D., Takayama N.

CMES - Computer Modeling in Engineering and Sciences 138 ( 2 ) 1237 - 1258 2024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）

In this study, we propose an algorithm selection method based on coupling strength for the partitioned analysis of structure-piezoelectric-circuit coupling, which includes two types of coupling or inverse and direct piezoelectric coupling and direct piezoelectric and circuit coupling. In the proposed method, implicit and explicit formulations are used for strong and weak coupling, respectively. Three feasible partitioned algorithms are generated, namely (1) a strongly coupled algorithm that uses a fully implicit formulation for both types of coupling, (2) a weakly coupled algorithm that uses a fully explicit formulation for both types of coupling, and (3) a partially strongly coupled and partially weakly coupled algorithm that uses an implicit formulation and an explicit formulation for the two types of coupling, respectively. Numerical examples using a piezoelectric energy harvester, which is a typical structure-piezoelectric-circuit coupling problem, demonstrate that the proposed method selects the most cost-effective algorithm.

DOI： 10.32604/cmes.2023.030211

Scopus

CiNii Research

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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

[No. 23-17] 日本機械学会第34回バイオフロンティア講演会〔2023.12.16-17，山口大学〕予稿集 1F10 2023年12月

Vein–Membrane Interaction in Cambering of Flapping Insect Wings 査読有り国際誌

Ishihara D., Onishi M., Sugikawa K.

Biomimetics ( MDPI AG ) 8 ( 8 ) 571 - 571 2023年12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）

It is still unclear how elastic deformation of flapping insect wings caused by the aerodynamic pressure results in their significant cambering. In this study, we present that a vein–membrane interaction (VMI) can clarify this mechanical process. In order to investigate the VMI, we propose a numerical method that consists of (a) a shape simplification model wing that consists of a few beams and a rectangular shell structure as the structural essence of flapping insect wings for the VMI, and (b) a monolithic solution procedure for strongly coupled beam and shell structures with large deformation and large rotation to analyze the shape simplification model wing. We incorporate data from actual insects into the proposed numerical method for the VMI. In the numerical analysis, we demonstrate that the model wing can generate a camber equivalent to that of the actual insects. Hence, the VMI will be a mechanical basis of the cambering of flapping insect wings. Furthermore, we present the mechanical roles of the veins in cambering. The intermediate veins increase the out-of-plane deflection of the wing membrane due to the aerodynamic pressure in the central area of the wing, while they decrease it in the vicinity of the trailing edge. As a result, these veins create the significant camber. The torsional flexibility of the leading-edge veins increases the magnitude of cambering.

DOI： 10.3390/biomimetics8080571

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85180488164&origin=inward

Computational fluid–structure interaction framework for passive feathering and cambering in flapping insect wings 査読有り国際誌

Ishihara D., Onishi M.

International Journal for Numerical Methods in Fluids 96 ( 4 ) 435 - 481 2023年11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）

In flapping insect wings, veins support flexible wing membranes such that the wings form feathering and cambering motions passively from large elastic deformations. These motions are essentially important in unsteady aerodynamics of insect flapping flight. Hence, the underlying mechanism of this phenomenon is an important issue in studies on insect flight. Systematic parametric studies on strong coupling between a model wing describing these elastic deformations and the surrounding fluid, which is a direct formulation of this phenomenon, will be effective for solving this issue. The purpose of this study is to develop a robust numerical framework for these systematic parametric studies. The proposed framework consists of two novel numerical methods: (1) A fully parallelized solution method using both algebraic splitting and semi-implicit scheme for monolithic fluid–structure interaction (FSI) equation systems, which is numerically stable for a wide range of properties such as solid-to-fluid mass ratios and large body motions, and large elastic deformations. (2) A structural mechanics model for insect flapping wings using pixel modeling (pixel model wing), which is combined with explicit node-positioning to reduce computational costs significantly in controlling fluid meshes. The validity of the proposed framework is demonstrated for some benchmark problems and a dynamically scaled model incorporating actual insect data. Finally, from a parametric study for the pixel model wing flapped in fluid with a wide range of solid-to-fluid mass ratios, we find a FSI mechanism of feathering and cambering motions in flapping insect wings.

DOI： 10.1002/fld.5251

Scopus

CiNii Research

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共振駆動される昆虫規範型微小飛行体の羽ばたき飛行性能評価

白川和, 石破和弥, 木村元宣, 石原大輔

[No.23-49] 日本機械学会第14回マイクロ・ナノ工学シンポジウム予稿集〔2023.11.6－9，熊本〕 2023年11月

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[No.23-24] 日本機械学会第 36 回計算力学講演会（CMD2023） ( 一般社団法人日本機械学会 ) OS-0202 2023年10月

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

Kaede Sugikawa, Minato Onishi, Daisuke Ishihara

Proceedings of the 42nd JSST Annual International Conference on Simulation Technology 155 - 158 2023年08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- 電気回路連成現象のハイブリッド型強連成解法

三笘征弘, 野崎隼之介, 石原大輔

計算工学講演会論文集 G-01-04 2023年05月

FIRST PROTOTYPE OF POLYMER MICROMACHINED FLAPPING WING NANO AIR VEHICLE 査読有り国際誌

Rashmikant, Ryotaro Suetsugu, Minato Onishi, and Daisuke Ishihara

Proceedings of 2023 IEEE 36th International Conference on Micro Electro Mechanical Systems (MEMS) 2023-January 534 - 537 2023年03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）

The novelty of this study includes the development of an insect-inspired flapping wing nano air vehicle (FWNAV) using polymer micromachining or MEMS flyer and its computational flight performance using a fluid-structure interaction (FSI) analysis. The present FWNAV consists of a micro transmission with a support frame, a micro wing, and a piezoelectric bimorph actuator. This FWNAV can be easily fabricated using polymer micromachining and its flight performance can be accurately predicted using the FSI analysis. Hence, this study will lead toward the development of tethered and flyable FWNAVs with the size of the smallest flying natural insects.

DOI： 10.1109/MEMS49605.2023.10052580

Kyutacar

Scopus

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