Updated on 2025/01/28

写真a

 
WU Zhqiang
 
Organization
Faculty of Advanced Engineering
Department
School of Engineering Department of Mechanical Systems Engineering
Title
Professor
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Education

  • Toyohashi University of Technology   Graduate School, Division of Engineering

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    Course completed: Doctor's Course

    Country: Japan

  • Toyohashi University of Technology   Graduate School, Division of Engineering

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    Course completed: Master's Course

    Country: Japan

  • Northeastern University   Faculty of Engineering

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    Country: China

  • Toyohashi University of Technology   Graduate School, Division of Engineering

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    Country: Japan

Degree

  • 博士(工学) ( 1995.3   豊橋技術科学大学 )

Research Field

  • Vibration, Resonance, Shape Opmitiaztion, Optimal Design, FEM Analysis

Research Experience

  • The University of Shiga Prefecture   School of Engineering Department of Mechanical System Engineering   Professor

    2018.10

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Design engineering

  • Informatics / Mechanics and mechatronics

  • Others / Others  / 医工学

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Machine elements and tribology

Qualification acquired

  • 第一種衛生管理

Available Technology

  • 数値解析と形状・構造最適設計

Papers

  • Simultaneous Optimization of Damper Arrangement and Shape in Vibration Problems (Approach using GA) Reviewed

    Naoki KISHI, Zhiqiang WU and Tomonori SHIGEYOSHI

    Proceedings of International Conference on Design and Concurrent Engineering 2023 & Manufacturing Systems Conference 2023   2023.9

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    Authorship:Corresponding author  

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

    Zhiqiang Wu, Kazuki Kamitani, Takashi Tanaka, Yasunori Oura

    Proceedings of the 15th International Conference on Motion and Vibration Control   2020.12

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    Language:English   Publishing type:Research paper (international conference proceedings)   Participation form:Joint(The main charge)  

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

    Takashi Tanaka, Junnosuke Asano, Yasunori Oura,Zhiqiang Wu

    Proceedings of the 15th International Conference on Motion and Vibration Control   2020.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Analysis of Tympanic Membrane Reconstruction with Various Thickness Cartilage Plates Reviewed

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

    IOP Conference Series: Materials Science and Engineering   886 ( 1 )   2020.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Conference Series: Materials Science and Engineering  

    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.

    DOI: 10.1088/1757-899X/886/1/012045

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    Other Link: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85090267545&origin=inward

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

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

    IOP Conference Series: Materials Science and Engineering   886 ( 1 )   2020.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Conference Series: Materials Science and Engineering  

    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.

    DOI: 10.1088/1757-899X/886/1/012032

    Scopus

    Other Link: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85090295091&origin=inward

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MISC

  • On End Effects of Micropolar Materials

    SUZUKI Kenta, FUJIE Yuta, NARITA Yusuke, ARIMITSU Yutaka, WU Zhiqiang

    The Proceedings of The Computational Mechanics Conference   2018 ( 0 )   220 - 220   2018

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    <p>We survey the optimum structure of micropolar materials under momentum loads as mechanical boundary conditions, which can be applied in two ways; one is couple of forces (CF-condition) and the other is the momentum load at a loading point (ML-condition). Though these two conditions of loading are macroscopically equivalent, the optimum structures for each boundary condition are different because of local stress conditions. Therefore, the decay of end effect is evaluated as a numerical result of stress distribution under the self-equilibrated load. Both symmetric and anti-symmetric parts of stress components decay within the width of a plate under CF-condition, however some area around loading points is required to decay end effects in the process of optimization. We also get the results of slow decay of end effects under ML-condition, and those effect should be considered in practical optimization problems under multiple loading points.</p>

    DOI: 10.1299/jsmecmd.2018.31.220

  • PS22 Multi-Objective Optimal Design of Knee Supporter for Osteoarthritis

    SHIBATA Nobuhiro, WU Zhiqiang, SOGABE Yuji, ARIMITSU Yutaka

    2012   "PS22 - 1"-"PS22-3"   2012.9

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Osteoarthritis (OA) is the most common type of arthritis. It is reported that about 30% of Japanese over 60 years old suffer osteoarthritis of the knee, and a lot of them need knee braces or supporters in daily life. A new type supporter, which is called rotating shaft type supporter, is invented for this disease. In this study, the optimal design of the frame of this type supporter is investigated. The design objective is to create holes in the design domain (i.e. create new sewing lines along the curve of holes) so that the frame can be fixed to the flexible cloth cover strongly and stably. It can also reduce the weight of the supporter, and improve the air permeability. Since it is important to guarantee the enough stiffness in load direction, a topology optimization approach is applied for the optimization analysis.

    CiNii Books

  • Simulation of inter-fiber sliding and buckling in fabric shaping process

    OHKITA Masayuki, ARIMITSU Yutaka, SOGABE Yuji, WU Zhiqiang

    2004 ( 57 )   75 - 76   2004.3

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    CiNii Books

Research Projects

  • QOL向上のための鼓膜再建用軟骨板の形状最適設計

    Grant number:21K03820  2021.4 - 2024.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    呉 志強

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    鼓膜穿孔は中耳炎や外傷により引き起こす中耳の病気一種である。治療するときに、患者自身の耳介などから軟骨を採取し、薄板にスライスして鼓膜の穴を塞ぐ術式が時々用いられる。この方法では、孔があるときに比べ聴力がある程度回復するものの、ヒト本来の聴覚特性に十分に回復できない場合がある。申請者は聴力回復が不十分の原因が、鼓膜本来の材料定数と軟骨の材料定数に大きな差があるためであると考えている。軟骨は鼓膜に比べ、両者の密度が近いにもかかわらず、ヤング率が鼓膜のヤング率の10分の1にも満たず、すなわち剛性不足である。この問題に対して申請者は、従来の均一厚さの軟骨板を使用する代わりに、厚さ方向に形状最適設計を行い、質量を増やさずに剛性を上げることが可能であると考えた。
    本研究では、まずCTスキャンのデータを基に、中耳の機械的振動を数値的に計算するための有限要素モデルを構築した。このモデルを利用し、軟骨板のヤング率が原因で、健常時の中耳に比べ、固有振動数が低下し、それにより、聴覚特性曲線におけるピーク位置の周波数が低下していることを確認した。そして、この状況を改善するために、軟骨板の形状設計において、板厚分布をリブ状のパタン化設計するのと、形状最適設計の手法を導入し、低下した固有振動数を上げる二つのアプローチを試みた。いずれも改善が可能であることが確認できた。
    また、今後のために、境界上に粘性減衰を有する場合の形状最適化の手法の開発を行った。本研究で用いる有限要素モデルでは、計算量が合理的な範囲内になるように、内耳の構造の詳細を省略し、代わりに内耳の影響を粘性ダンパーで近似した。今までは粘性ダンパーを有する場合の効率的な形状最適化の手法がないため、その手法の開発を先に行った。簡単なモデルを用いて有効性を確認した。この成果は機械部品や、構造の形状最適化の一つの手法に発展する可能性がある。

  • 生活を豊かにする知能福祉ロボット開発

    2015.4 - 2016.3

    愛媛大学工学部  学部長裁量経費 

    柴田 論, 山本智規, 李 在勲, 呉 志強

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    Authorship:Principal investigator  Grant type:Competitive

  • Survey of Engineering Textbooks in Far East Asian Countries and Choices and Issues in Japan

    Grant number:22500813  2010 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    ARIMITSU Yutaka, YAGI Hidetsugu, WU Zhqiang, LEE Jaehoon

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    Grant amount:\3250000 ( Direct Cost: \2500000 、 Indirect Cost:\750000 )

    The authors think that engineering textbooks used in Japanese universities have been getting easier. The situation is favorable for beginners because of their basic understanding, but whether learning process is suitable or not is disputable. The authors have been surveying the situation of mechanical design textbooks in Far East Asian countries. Characteristics in these countriesare as follows:
    1) in China, textbooks in universities whose contents are practical are planed by the state
    2) in Korea, wide ranging contents using translations from English and originals by Korean are employed
    3) in Taiwan, English textbooks using American standards and imperial systems are employed. Since engineering is related to industries and social system, engineering textbooks are reflected from nation’s policy and influence industry.

Presentations

  • Shape Optimization for Wideband Amplitude Regulation Problem of Structures with Viscous Damper (Toward Reconstruction of Eardrum)

    Zhiqiang WU, Katsuhiro OKAMOTO, Tomonori Shigeyoshi

    OPTIS2022  2022.11  The Japan Society of Mechanical Engineers

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Nagoya University  

  • Shape optimization for strain energy minimization problem with damper element

    Tomonori Shigeyoshi, Zhiqiang WU

    Mechanical Engineering Congress, 2020 Japan  2022.9  The Japan Society of Mechanical Engineers

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:University of Toyama  

  • Numerical investigation of the relation between coefficient of restitution and natural vibration characteristics

    Kokichi SUGIURA, Zhiqiang WU

    Mechanical Engineering Congress, 2020 Japan  2022.9  The Japan Society of Mechanical Engineers

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:University of Toyama  

  • 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)

    神谷一貴,岡本克洋,呉志強

    日本機械学会関西支部第97回定時総会講演会  2022.3  日本機械学会

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  • Shape optimization in frequency response problem with viscus damping in boundary

    Shigeyoshi Tomonori, Wu Zhiqiang

    2022.3  The Japan Society of Mechanical Engineers

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online  

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