二保 知也 (ニホ トモヤ)

NIHO Tomoya

写真a

職名

准教授

研究室住所

福岡県飯塚市川津680-4

研究分野・キーワード

計算力学

メールアドレス

メールアドレス

ホームページ

http://www-solid.mse.kyutech.ac.jp/

出身大学 【 表示 / 非表示

  • 1992年03月   九州工業大学   情報工学部   機械システム工学科   卒業   日本国

出身大学院 【 表示 / 非表示

  • 1997年03月  九州工業大学  情報工学研究科  情報システム  博士課程・博士後期課程  修了  日本国

取得学位 【 表示 / 非表示

  • 九州工業大学 -  博士(情報工学)  1997年03月

学内職務経歴 【 表示 / 非表示

  • 2019年04月
    -
    継続中

    九州工業大学   大学院情報工学研究院   知的システム工学研究系   准教授  

  • 2017年03月
    -
    2019年03月

    九州工業大学   大学院情報工学研究院   機械情報工学研究系   准教授  

専門分野(科研費分類) 【 表示 / 非表示

  • 計算科学

  • 生産工学・加工学

  • 機械材料・材料力学

 

論文 【 表示 / 非表示

  • Finite element analysis of a thin piezoelectric bimorph with a metal shim using solid direct-piezoelectric and shell inverse-piezoelectric coupling with pseudo direct-piezoelectric evaluation

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

    Composite Structures    245   2020年08月  [査読有り]

     概要を見る

    © 2020 Elsevier Ltd A thin triple-layer piezoelectric bender, also known as a piezoelectric bimorph with a metal shim, consists of an elastic layer (metal shim) sandwiched between two piezoelectric layers. It is one of the most commonly used piezoelectric composite structures in both sensing and actuation applications. Therefore, this study deals with the coupled piezoelectric-structure interaction analysis of a thin piezoelectric bimorph with a metal shim. In this work, the best features of the solid and shell elements were combined to analyze the piezoelectric and structural fields, respectively, in a thin piezoelectric bimorph with a metal shim. This approach addresses the shortcomings of using a single finite element mesh for both the piezoelectric and structural fields. A transformation method using the block Gauss-Seidel algorithm is employed to exchange the variables between solid direct-piezoelectric and shell inverse-piezoelectric analyses. The metal layer can be analyzed as an elastic body with electrical boundary conditions. A pseudo direct-piezoelectric evaluation method for the metal shim in the piezoelectric analysis is proposed. This method allows us to reuse the existing piezoelectric analysis program, where the metal shim is analyzed as the pseudo direct-piezoelectric material in a single analysis procedure. The homogenization method for the evaluation of bending rigidity and mass is used for modeling the single shell structure in the inverse-piezoelectric analysis of a thin piezoelectric bimorph with a metal layer. Numerical results are given for various electrical configurations of actuators and sensors to validate the present method. Comparison with an exact solution illustrates the accuracy, efficiency, and capability of the developed solid direct and shell inverse-piezoelectric analysis coupled with a pseudo direct-piezoelectric evaluation method to capture the sensor and actuator response of a thin piezoelectric bimorph with a metal shim.

    DOI Scopus

  • Hierarchically decomposed finite element method for a triply coupled piezoelectric, structure, and fluid fields of a thin piezoelectric bimorph in fluid

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

    Computer Methods in Applied Mechanics and Engineering    365   2020年06月  [査読有り]

     概要を見る

    © 2020 Elsevier B.V. This paper proposes a numerical method for analyzing a thin piezoelectric bimorph in fluid. A hierarchically decomposed finite element method (FEM) is proposed for modeling the triply coupled piezoelectric-structure–fluid interaction. The electromechanical coupling (piezoelectric-structure interaction) behavior in a thin piezoelectric bimorph is described by the classical constitutive equation, the incompressible fluid flows by the Navier–Stokes equation and the structure by the Cauchy equation of motion. The piezoelectric-structure–fluid interaction system is decomposed into subsystems of fluid–structure interaction (FSI) and piezoelectric field, then the piezoelectric field and the FSI are coupled using the block Gauss–Seidel method, the fluid–structure interaction is split into the fluid–structure velocity field and the pressure field using an algebraic splitting and the fluid–structure velocity field is partitioned into fluid velocity field and structure velocity field. Using the proposed method, the resonance characteristics of a piezoelectric bimorph cantilever made of PVDF and PZT-5H material in fluid are investigated for actuation and sensor configurations.

    DOI Scopus

  • Element-quality-based stiffening for the pseudoelastic mesh-moving technique

    Ishihara D., Goto A., Onishi M., Horie T., Niho T.

    International Journal of Computational Methods    17 ( 4 )   2020年05月  [査読有り]

     概要を見る

    © 2020 World Scientific Publishing Company. In this study, element-quality-based stiffening (EQBS) was developed as a method of maintaining mesh quality in the pseudoelastic mesh-moving technique. The proposed EQBS technique increases the stiffness of the element based on two element quality parameters, the element area and shape; this differs from techniques used in previous studies. Importantly, EQBS includes the previously proposed Jacobian-based stiffening (JBS) and minimum height-based stiffening (MHBS) techniques as a specific case. Therefore, it is quite general scenario of the selective stiffening of the mesh. The proposed EQBS technique was applied to the mesh-moving of a rectangular domain including a structure consisting of a square and a fin that undergo large translations and rotations. The proposed EQBS technique showed better performance than JBS on test problems with large translations and rotations applied to the structure. This is because EQBS considers the shear deformation of the element in addition to the tensile and compressive deformations.

    DOI Scopus

  • Fluid-structure and electric interaction analysis of piezoelectric flap in a channel using a strongly coupled FEM scheme

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

    Proceedings of the 6th European Conference on Computational Mechanics: Solids, Structures and Coupled Problems, ECCM 2018 and 7th European Conference on Computational Fluid Dynamics, ECFD 2018      382 - 393   2020年01月  [査読有り]

     概要を見る

    Copyright © Crown copyright (2018).All right reserved. Electric and Fluid-Structure interaction (EFSI) is a complex coupled multi-physics phenomenon appears in microelectromechanical system (MEMS) when these microdevices are operated in a fluid media. In this study, the EFSI phenomena refer to a combination of electromechanical (electric-structure interaction) coupling and fluid-structure interaction coupling. Both the electromechanical coupling and the fluid-structure interaction can be simulated in a monolithic way or in a partitioned iteration way. In the proposed method the electromechanical coupling is simulated in a partitioned iterative way with separate solvers for the electrical and mechanical equations using block Gauss-Seidel (BGS) iteration method, while the fluid-structure interaction is simulated in a monolithic way by solving the fluid and structure equations simultaneously using a projection method. The proposed algorithm combines these two methods to analyze the strongly coupled EFSI in MEMS. The proposed method is applied to a flexible flap made of piezoelectric bimorph actuator in a converging channel. The EFSI analysis results show a good agreement with FSI results when a very low input bias voltage is applied to the actuator.

    Scopus

  • Performance Evaluation of Numerical Finite Element Coupled Algorithms for Structure-Electric Interaction Analysis of MEMS Piezoelectric Actuator

    Ramegowda P., Ishihara D., Niho T., Horie T.

    International Journal of Computational Methods    16 ( 7 )   2019年11月  [査読有り]

     概要を見る

    © 2019 World Scientific Publishing Company. This work presents multiphysics numerical analysis of piezoelectric actuators realized using the finite element method (FEM) and their performances to analyze the structure-electric interaction in three-dimensional (3D) piezoelectric continua. Here, we choose the piezoelectric bimorph actuator without the metal shim and with the metal shim as low-frequency problems and a surface acoustic wave device as a high-frequency problem. More attention is given to low-frequency problems because in our application micro air vehicle's wings are actuated by piezoelectric bimorph actuators at low frequency. We employed the Newmark's time integration and the central difference time integration to study the dynamic response of piezoelectric actuators. Monolithic coupling, noniterative partitioned coupling and partitioned iterative coupling schemes are presented. In partitioned iterative coupling schemes, the block Jacobi and the block Gauss-Seidel methods are employed. Resonance characteristics are very important in micro-electro-mechanical system (MEMS) applications. Therefore, using our proposed coupled algorithms, the resonance characteristics of bimorph actuator is analyzed. Comparison of the accuracy and computational efficiency of the proposed numerical finite element coupled algorithms have been carried out for 3D structure-electric interaction problems of a piezoelectric actuator. The numerical results obtained by the proposed algorithms are in good agreement with the theoretical solutions.

    DOI Scopus

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口頭発表・ポスター発表等 【 表示 / 非表示

  • 接触電気抵抗の大規模ミクロスケール接触変形・電流連成有限要素解析

    二保 知也

    計算力学講演会講演論文集  2018年11月  -  2018年11月   

  • 構造シェル要素と電界ソリッド要素を用いた複合材圧電バイモルフの分離反復型解法

    高田 黎,

    計算力学講演会講演論文集  2018年11月  -  2018年11月   

  • マルチスケール抵抗スポット溶接シミュレーションのための酸化皮膜を考慮した微視接触電気抵抗解析

    倉前 宏行

    計算力学講演会講演論文集  2018年11月  -  2018年11月   

  • 鋼板の表面状態を考慮したミクロスケール接触電気抵抗解析 および抵抗スポット溶接解析への応用

    二保 知也

    溶接学会全国大会講演概要  2018年09月  -  2018年09月   

  • マルチスケール抵抗スポット溶接解析のための微視有限要素モデルの検討

    倉前 宏行, 二保 知也, 荒牧 弘親, 大矢 健吾, 堀江 知義

    計算力学講演会講演論文集  2017年09月  -  2017年09月   

    CiNii

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学術関係受賞 【 表示 / 非表示

  • 素形材産業技術賞(一般財団法人素形材センター会長賞)

    2019年11月01日   一般財団法人素形材センター   ステンレス鋼管のプロジェクション溶接技術の開発   日本国

    受賞者:  森木信一,北原実,堀江知義,二保知也,高橋明宏,山元直行

  • 溶接学会溶接技術奨励賞

    2019年04月20日   一般社団法人溶接学会九州支部   日本国

    受賞者:  二保知也

  • 溶接学会論文賞

    2018年04月25日   一般社団法人溶接学会   日本国

    受賞者:  二保 知也,堀江 知義

科研費獲得実績 【 表示 / 非表示

  • 電磁・流体・構造連成振動現象の連成並列有限要素解析方法の研究

    若手研究(B)

    研究期間:  2006年04月  -  2008年03月

    研究課題番号:  18760066

  • 電磁構造連成弾性振動を用いた非接触振動制御技術の研究

    若手研究(B)

    研究期間:  2004年04月  -  2006年03月

    研究課題番号:  16760178

  • 磁気減衰効果を用いた構造物の非接触制振方法の研究

    奨励研究(A)

    研究期間:  2000年04月  -  2002年03月

    研究課題番号:  12750185

 

担当授業科目 【 表示 / 非表示

  • 2019年度  構造システムの基礎Ⅱ

  • 2019年度  エネルギ原理と有限要素法特論

  • 2018年度  はりの力学

  • 2018年度  エネルギ原理と有限要素法特論

  • 2017年度  はりの力学

全件表示 >>