Realization of multi-mode vibration reduction of flexible structures utilizing visco-elastic bodies

• Project/Area Number: 18K04024
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: Akita Prefectural University
• Principal Investigator: Tomioka Takahiro 秋田県立大学, システム科学技術学部, 教授 (00425860)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 弾性振動 / 制振 / 動吸振器 / 粘弾性体 / マルチモード制振 / パッシブ制振 / 減衰

Outline of Final Research Achievements

Multi-mode vibration reduction of elastic vibration in flexible structures has been studied in this research by utilizing the vibration of the visco-elastic body in multiple directions as a dynamic vibration absorber (DVA). Using an elongated flat plate that simulates the underframe of a railway vehicle on a scale of about 1:10, we constructed an evaluation system for its elastic vibration characteristics and examined the effectivity of proposed multi-mode vibration damping devices. Some unique vibration damping devices were newly proposed such as; a DVA using vibration of super absorbent polymer beads; a multi modal DVA with frequency adjustment mechanism by changing the amount of compression of visco-elastic rubbers supporting a vibrating mass; and a DVA consisting of a mass embedded in spherical visco-elastic medium. All of the proposed devices were applied to the model underframe and the multi-mode vibration damping effects have been confirmed.

Academic Significance and Societal Importance of the Research Achievements

軽量化や構造簡素化に伴い機械構造物の弾性振動が問題となるが，弾性振動は様々な形状で生じ，特定のモードを対象とした制振では不十分なことが多い．本研究は構造物の弾性振動のマルチモード制振に取り組んだもので，センサやアクチュエータ，制御システム等が不要で低コストの制振法であり，広く産業応用が見込める．提案したデバイスを実構造物に適用してマルチモード制振効果を確認しており，実現可能性が示されているほか，特許出願も行っている．また，鉄道車両の乗客による車体のマルチモード制振効果をもとにした従来にない発想による制振法である．以上より学術的意義と，社会的意義を有する成果が得られていると考えている．

Research Products

• [Journal Article] Vibration of straight and curved beam coupled systems: Proposal of a simple model for side structures of railway vehicle carbodies to analyse their elastic vibrations (2020)
  • Author(s): Takahiro Tomioka
  • Journal Title: Klomp M., Bruzelius F., Nielsen J., Hillemyr A. (eds) Advances in Dynamics of Vehicles on Roads and Tracks. IAVSD 2019. Lecture Notes in Mechanical Engineering. Springer, Cham Volume: - Pages: 929-937
  • DOI: 10.1007/978-3-030-38077-9_108
  • ISBN: 9783030380762, 9783030380779
  • Peer Reviewed
• [Journal Article] Multimodal Reduction of Elastic Vibrations in Plate Structure using Super Absorbent Polymer Beads (2020)
  • Author(s): Tomioka Takahiro、Minamisawa Karen
  • Journal Title: EPI International Journal of Engineering Volume: 3 Issue: 1 Pages: 21-29
  • DOI: 10.25042/epi-ije.022020.03
  • Peer Reviewed
• [Presentation] 3軸を粘弾性支持された立方体質量による動吸振器の開発 (2020)
  • Author(s): 宮坂岳宏, 富岡隆弘
  • Organizer: 日本機械学会 2020年度年次大会
• [Presentation] 平板とはりを組み合わせた数値解析モデルを用いた筒状構造物の 簡易な弾性振動解析手法 (2020)
  • Author(s): 坂下友哉, 富岡隆弘
  • Organizer: 日本機械学会 2020年度年次大会
• [Presentation] Vibration of straight and curved beam coupled systems: Proposal of a simple model for side structures of railway vehicle carbodies to analyse their elastic vibrations (2019)
  • Author(s): Takahiro Tomioka
  • Organizer: 26th Symposium of the International Association of Vehicle System Dynamics (IAVSD 2019)
  • Int'l Joint Research
• [Presentation] 3軸を粘弾性支持された質量による動吸振器の検討 (2019)
  • Author(s): 宮坂岳宏, 富岡隆弘
  • Organizer: 日本機械学会 Dynamics and Design Conference 2019
• [Presentation] 異方性をもつ任意境界条件の平板構造物の簡易な弾性振動解析手法 (2019)
  • Author(s): 坂下友哉, 富岡隆弘
  • Organizer: 日本機械学会 Dynamics and Design Conference 2019
• [Presentation] 角筒状構造体の弾性振動に対する端部拘束と質量分布の影響に関する実験的検討 (2019)
  • Author(s): 佐々木諒, 富岡隆弘
  • Organizer: 日本機械学会 Dynamics and Design Conference 2019
• [Presentation] Vibration of curved and straight beam coupled systems -Proposal of a simple model for side structures of railway vehicle carbodies to analyse their elastic vibrations- (2019)
  • Author(s): Takahiro Tomioka
  • Organizer: The 26th IAVSD International Symposium on Dynamics of Vehicles on Roads and Tracks (IAVSD2019)
  • Int'l Joint Research
• [Presentation] 3軸を粘弾性支持された質量による動吸振器の検討 (2019)
  • Author(s): 宮坂岳宏，富岡隆弘
  • Organizer: 日本機械学会機械力学・計測制御部門講演会（Dynamics and Design Conference 2019）
• [Presentation] 異方性をもつ任意境界条件の平板構造物の簡易な弾性振動解析手法 (2019)
  • Author(s): 坂下友哉，富岡隆弘
  • Organizer: 日本機械学会機械力学・計測制御部門講演会（Dynamics and Design Conference 2019）
• [Presentation] 角筒状構造体の弾性振動に対する端部拘束と質量分布の影響に関する実験的検討 (2019)
  • Author(s): 佐々木諒，富岡隆弘
  • Organizer: 日本機械学会機械力学・計測制御部門講演会（Dynamics and Design Conference 2019）
• [Patent(Industrial Property Rights)] 制振装置 (2020)
  • Inventor(s): 富岡隆弘，樋口京哉
  • Industrial Property Rights Holder: 公立大学法人秋田県立大学
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2020-082339
  • Filing Date: 2020