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Study on the Design for Noise Reduction by Applying the Sound Generating Mechanism of a Bell Cricket

Research Project

Project/Area Number 11450067
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 設計工学・機械要素・トライボロジー
Research InstitutionTokyo Institute of Technology

Principal Investigator

IWAO Hayashi  Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (80016790)

Co-Investigator(Kenkyū-buntansha) MORIKAWA Koichi  Tokyo Institute of Technology, Graduate School of Science and Engineering, Research Associate, 大学院・理工学研究科, 助手 (00282830)
IWATSUKI Nobuyuki  Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (70193753)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 2000: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1999: ¥8,500,000 (Direct Cost: ¥8,500,000)
KeywordsBell cricket / Cricket / Experimental modal analysis / Wing / Finite element method / Noise / Sound generating mechanism / Frequency spectrum / 実験振動モード解析 / 静音快適化設計
Research Abstract

It is one of very important issues in our society to solve problems in the field of NVH, such as the vibration, noise, and harshness of machines, and to create a life space which is comfortable to human beings. The optimum design method of machine structures, however, has not been established to inform the operating state of machines with comfortable sounds. This research deals with the sound generating mechanism of a cricket and a bell cricket in order to apply the mechanism to convert the noises of machines into comfortable sounds.The wing motions of a cricket and a bell cricket were observed by a high-speed video camera when the crickets sang and the sequences of singing motion were revealed. The details of the file and rubbing parts on the wings were also revealed by observing with a scanning electron microscopy. The natural modes of flexural vibration of a wing were not only experimentally analyzed by exciting the wing with a piezoactuator and detecting the motion of vibration with a microscopic laser vibrometer but also theoretically calculated by using the FEM models of the wings. The frequency spectra of the sound of the crickets were analyzed by FFT and the main frequencies of major singing ways were then found. The sound generating mechanism of the singing crickets was resultantly found. Finally, the frequency band of a sound pleasing to the ear was obtained by reproducing the sound of the crickets and evaluating the comfortableness.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 林巖 他4名: "コオロギの翅の振動モードの測定"1999年度精密工学会秋季大会学術講演会講演論文集. 87-87 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 山本和男,林巖 他3名: "コオロギの発音メカニズムの研究"日本機械学会機械力学・計測制御講演論文アブストラクト集. 00-6. 147-147 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 林巖 他5名: "コオロギとスズムシの発音機構の工学的検討"第6回日本IFToMM会議シンポジウム前刷集. 81-88 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] I.Hayashi and et al.: "Study on the Vibration Mode of the Wing of a Cricket"Proceedings of the 1999 Autumn Symposium of the Japan Society of Precision Engineering. 87 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Yamamoto, I.Hayashi and et al.: "Study of the Sound Generating Mechanism of a Cricket"Proceedings of Dynamics and Design Conference 2000. 147 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] I.Hayashi and et al.: "Study on the Sound Generating Mechanism of a Cricket and Bell Cricket"Proceedings of the 6th Japan IFToMM Symposium. 81-88 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 山本和男,林巖 他3名: "コオロギの発音メカニズムの研究"日本機械学会 機械力学・計測制御講演論文アブストラクト集. 00-6. 147 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 林巖 他5名: "コオロギとスズムシの発音機構の工学的検討"第6回日本IFToMM会議シンポジウム前刷集. 81-88 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 林 巌 他4名: "コオロギの翅の振動モードの測定"1999年度精密工学会秋季大会学術講演会講演論文集. 87-87 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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