呉 志強 (ウー チーチャン)

WU Zhqiang

写真a

職名

教授

研究分野・キーワード

振動、共振、形状最適化、最適設計、FEM解析

ホームページ

http://www.mech.usp.ac.jp/~hnw/index.html

プロフィール

1995年4月 愛媛大学工学部 助手
2005年4月 愛媛大学工学部 講師
2017年10月 愛媛大学大学院理工学研究科 准教授
2018年10月 滋賀県立大学工学部 教授

出身学校 【 表示 / 非表示

  • 中国東北大学  工学部  機械2系  1987年07月

出身大学院 【 表示 / 非表示

  • 豊橋技術科学大学  工学研究科  エネルギー工学専攻  修士課程  1992年03月

  • 豊橋技術科学大学  工学研究科  総合エネルギー工学専攻  博士課程  1995年03月

取得学位 【 表示 / 非表示

  • 博士(工学)  豊橋技術科学大学  1995年03月

学内職務経歴 【 表示 / 非表示

  • 滋賀県立大学  工学部  機械システム工学科  教授   2018年10月 ~ 現在

研究分野(科研費分類) 【 表示 / 非表示

  • 機械力学・制御

  • 設計工学・機械機能要素・トライボロジー

  • 医工学

各種免許(危険物取扱者免許等)の保持 【 表示 / 非表示

  • 第一種衛生管理

 

論文 【 表示 / 非表示

  • Finite element investigation of using cartilage plate with varying thickness in cartilage myringoplasty

    Zhiqiang Wu, Kazuki Kamitani, Takashi Tanaka, Yasunori Oura

     Proceedings of the 15th International Conference on Motion and Vibration Control    2020年12月

    共著  共同(主担当)

  • Detection of contact-type failure by measurement of structural intensity of low-frequency vibration caused by frequency down-conversion of elastic vibrations

    Takashi Tanaka, Junnosuke Asano, Yasunori Oura,Zhiqiang Wu

     Proceedings of the 15th International Conference on Motion and Vibration Control    2020年12月

    単著  

  • Detection of Contact-type Failure Based on Non-linear Wave Modulation Utilizing Self-excited Ultrasonic Vibration: Evaluation of Failure Development Focusing on Frequency Modulation

    Tanaka T., Maeda S., Oura Y., Wu Z.

    IOP Conference Series: Materials Science and Engineering  IOP Conference Series: Materials Science and Engineering  886 (1)    2020年07月

    10.1088/1757-899X/886/1/012032  共著  

    [概要]

    This research concerns the detection method of contact-type failure based on nonlinear wave modulation utilizing ultrasonic vibration driven by self-excitation. When the structure is vibrating by environmental force or forced excitation, the contact area is fluctuated by vibration. In this condition, the vibration transfer characteristics of ultrasonic vibration have fluctuated in synchronization with vibration (non-linear wave modulation). The detection method based on non-linear wave modulation can detect contact-type failure. In this paper, the novel detection method based on nonlinear wave modulation is presented. Firstly, the self-excitation method using local feedback control is introduced. Local feedback control can oscillate at the natural frequency automatically. Secondly, the concept of a novel detection method is introduced. When the structure with contact-type failure is vibrating, the frequency of the ultrasonic vibration excited by local feedback control will fluctuate in synchronization with natural frequency fluctuation. To explain the detection method, non-linear wave modulation is expressed 1 degree of freedom model. In this model, the local stiffness fluctuation is modelled by the spring element of which spring coefficient is fluctuated in synchronization with structural vibration. We regard the transfer function of this model as a linear time-varying system. The amplitude of the fluctuation of natural frequency caused by stiffness fluctuation can be the novel index of failure level. Lastly, the result of the experiment using the uniform beam specimen is shown. From the relationship between forcing pressure of the contact-type failure and the amplitude of the frequency modulation, it is proved that the novel index is associated with failure level.

  • Analysis of Tympanic Membrane Reconstruction with Various Thickness Cartilage Plates

    Wu Z., Tanaka T., Kamitani K., Oura Y., Hidayat H.

    IOP Conference Series: Materials Science and Engineering  IOP Conference Series: Materials Science and Engineering  886 (1)    2020年07月

    10.1088/1757-899X/886/1/012045  共著  

    [概要]

    The purpose of this research is to investigate an appropriate design of the sliced cartilage used for the reconstruction of the tympanic membrane (TM). A great number of people are suffering from TM perforation caused by diseases or accidents. A surgical procedure, called cartilage myringoplasty, can save the people from hearing loss by replacing the damaged part of the membrane with thin-sliced cartilage. In this research, as the first step of designing the sliced cartilage, we established a three-dimensional finite element model of the human ear for numerical analysis. The ear model consists of the middle ear (TM, ossicular chain, ligaments, muscle), and inner ear cochlea. The joints between ear bones were also modelled with softer tissues. The analysis result of the frequency response shows a good correspondence with measurement results reported by other researchers. Then, using the numerical model, we investigated the optimal thickness of the cartilage plate. The TM was cut at the bottom position with a size of about 40% of TM and filled by cartilage plate with the thickness of 0.1mm to 0.7mm. Comparing with the frequency response of the healthy ear, we found that the optimal thickness of the plate is different in a various frequency range. The reason is considered as the difference of material properties between the membrane and the cartilage. Finally, to evaluate the performance of repaired models in all frequency range, we proposed an equation of matching rate as the evaluation equation. The results show that 0.5mm cartilage plate model shows a better performance at peak response area (600Hz-1kHz), and 0.3mm. cartilage plate model shows better average performance in the total frequency range.

  • Design optimization of cable membrane structures for form-finding and stiffness maximization

    史 金星,呉 志強,下田 昌利

     Composite Structures  192    2018年05月

    共著  

  • Golf Clubhead Optimization Based on Contribution of Eigenmodes

    呉 志強,曽我部 雄次,有光 隆

     International Journal of Computational Methods    2018年04月

    共著  

  • Identification of Mechanical Models for Golf Ball Materials Using a Viscoelastic Split Hopkinson Pressure Bar

    玉男木 隆之,曽我部 雄次,呉 志強,横山 隆

     Journal of Dynamic Behavior of Materials   1 ~ 14  2017年04月

    共著  

  • Free-form optimization of a frame structure for strength maximization

    呉 志強,下田 昌利 ,久富 圭,史 金星

     Mechanical Engineering Journal  4 (2)    2017年03月

    共著  

  • A Study on Developing Percussion Instrument with Tobe Pottery

    呉 志強.有光 隆,曽我部 雄次,柴田 論

     International Journal on Smart Material and Mechatronics  3 (2)   201 ~ 206  2017年03月

    共著  

  • A System Reducing Pressure of Buttock while Seating Using Pneumatic Actuators

    柴田 論,山本 山本 智規,呉 志強

     International Journal on Smart Material and Mechatronics  3 (2)   215 ~ 219  2017年03月

    共著  

会議での講演 【 表示 / 非表示

  • 鼓膜形成手術用軟骨の厚み設計による聴覚特性の改善(固有振動数設計によるアプローチ)

    日本機械学会関西支部第97回定時総会講演会  2022年03月

  • 粘性減衰境界を有する周波数応答問題の形状最適化

    2021年度関西学生会卒業研究発表講演会  2022年03月

  • ディスクブレーキの面内鳴き現象(ディスク固有振動の面内外比に着目した鳴き対策)

    Dynamics & Design Conference 2020  2020年09月

  • 振動インテンシティ計測による弾性振動の周波数down-conversionに基づく接触型損傷の位置同定

    Dynamics & Design Conference 2020  2020年09月

  • 加振点間で形成される局所的定在波を用いた非線形波動変調に基づく接触型損傷検出

    Dynamics & Design Conference 2020  2020年09月

  • 分散制御による直列結合型振動推進機構の高効率駆動

    Dynamics & Design Conference 2020  2020年09月

  • 分散制御による多点加振を用いた音響空間の固有振動計測(遮蔽物が音響空間の伝達特性に及ぼす影響)

    Dynamics & Design Conference 2020  2020年09月

  • 有限要素法を用いた病変時の中耳の伝音特性解析

    Dynamics & Design Conference 2020  2020年09月

  • 分散制御による直列結合型振動推進機構の高効率駆動

    「運動と振動の制御」シンポジウム  2019年12月

  • ディスクブレーキの面内鳴き現象 (ディスク構造変更による鳴き低減)

    「運動と振動の制御」  2019年12月

全件表示 >>

研究シーズ 【 表示 / 非表示

  • 数値解析と形状・構造最適設計