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Study on Seismic Behavior of Mechanical Snubbers

Research Project

Project/Area Number 62550187
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 機械力学・制御工学
Research InstitutionMeiji University

Principal Investigator

OHMATA Kenichiro  Professor, Faculty of Engineering, Meiji Univ., 工学部, 教授 (10061954)

Co-Investigator(Kenkyū-buntansha) ARAKAWA Toshiharu  Research Assistant, Faculty of Engineering, Meiji Univ., 工学部, 助手 (80159491)
SHIMODA Hirokazu  Research Assistant, Faculty of Engineering, Meiji Univ., 工学部, 助手 (10130816)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
KeywordsMechanical Snubber / Mechanical Damper / Earthquakeproof Device / Piping / Earthquake Response / Nonlinear Vibration / 連続系シミュレーション言語 / ボールねじ / リサージュ波型 / はりの振動 / はりの地震応答
Research Abstract

The mechanical snubber is an earthquakeproof device for piping systems under particular circumstances such as high temperature and radioactivity, and consists of a ball screw, a flywheel, a brake disk and brake shoe. It moves without any resitance in response to a slow movement such as thermal expansion of pipings and restrains displacement caused by a rapid movement such as earthquake. It has nonlinearities in both load and frequency response, so it will be very difficult to analyze the resisting force characteristics of the mechanical snubber theoretically.
In this research, the equation of motion of the mechanical snubber was derived and the resisting force characteristics of the snubber were simulated using Continuous System Simulation Language (CSSL). The digital simulations were carried out for various kinds of physical properties of the snubber and over a wide range. The earthquake responses of piping (a simply supported beam) which is supported by the snubber were also simulated using CSSL. The restraint effect and the maximum resisting force of the snubber during earthquake were discussed and compared with the case of an oil damper.
The resisting force characteristics of a snubber available in the market were measured using the vibration testing machine built as trial. The experimental results agreed fairly well with the results of the digital simulations, so that the validity of the digital simulations were substantiated.
Moreover, the effects of vibration isolation of a new type of mechanical damer which is composed of a ball screw, a flywheel and a vertically oscillating governor were discussed theoretically and experimentally. This damper acts as a snubber for larger values of the moment of inertia J of the flywheel and acts as general absorber for smaller values of J.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 大亦絢一郎: 日本機会学会論文集 (C編). 53巻492号. 1697-1703 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 下田博一: 日本機会学会論文集 (C編). 54巻499号. 610-616 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 大亦絢一郎: 日本機会学会北海道支部第30期総会講演会概要集. No.892-1. 23 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Ohmata Kenichiro: "Resisting Force Characteristics of a Mechanical Snubber and Its Restraint Effect on Beam Deformation" Transactions of the Japan Society of Mechanical Engineering (C). 53-492. 1697-1703 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Shimoda Hirokazu: "Study on a Ball Screw Type Damer with a Vertically Oscillating Governor" JSME International Journal, Series 3. 31-3. 510-516 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Ohmata Kenichiro: "Earthquake Responses of a Beam Supported by a.Mechanical Snubber" Preprint of the Japan Society of Mechanical Engineering. No.892-1. 23 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 大亦絢一郎: 日本機械学会北海道支部第30期総会講演会講演概要集. No.892-1. 23 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 大亦 絢一郎: 日本機械学会論文集(C編). 53-492. 1697-1703 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 由井 秀人 大亦 絢一郎: 日本シミュレーション学会 第8回研究発表会資料. 101-106 (1987)

    • Related Report
      1987 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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