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Motion analysis of a flexible structure in water considering air flow in the structure

Research Project

Project/Area Number 18H01633
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionThe University of Tokyo

Principal Investigator

Kitazawa Daisuke  東京大学, 生産技術研究所, 教授 (30345128)

Co-Investigator(Kenkyū-buntansha) 吉田 毅郎  東京大学, 生産技術研究所, 助教 (30771505)
韓 佳琳  大阪府立大学, 工学(系)研究科(研究院), 助教 (40814877)
李 僑  東京大学, 生産技術研究所, 特任研究員 (40832340)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2020: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2018: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywords可撓性構造物 / 海中浮沈技術 / 流体・構造連成 / 内部空気流れ / 水槽実験 / 実海域実験 / 水槽模型実験 / 流体・構造連成解析 / 現地実験
Outline of Final Research Achievements

Flexible structures are widely used in the ocean, such as oil fence, fishing gear, and salvage equipment. The purpose of this study was to examine the behavior of the flexible hose net, which is used to improve the work efficiency of the set net fishery, when air is injected into or exhausted from the hoses. The bending stiffness of the flexible hose net changes depending on the presence or absence of air inside, and its motion is affected by the internal air flow. Considering these characteristics, we made a scale model based on the similarity law and conducted a water tank experiment to clarify the relationship between air injection or exhaust and the motion and shape of the flexible hose net. Furthermore, we have developed a two-dimensional analysis model that integrates the models of the internal air flow and the behavior of the flexible hose net.

Academic Significance and Societal Importance of the Research Achievements

柔軟なホース等に代表される可撓性構造物は、安価で扱いやすい構造物として海洋で利用されている。本研究では,可撓性構造物内部の流体の流れとその運動が相互に影響を及ぼし合う問題を水槽実験、二次元の数値モデルによって解析した点に特色がある。自然環境における可撓性構造物の性能を理解することにより、可撓性構造物が海上での流体の輸送、水産での省力化、海底での資源開発等に広く応用されることが期待される。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (8 results)

All 2021 2020 2019 2018 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] Experimental study on fish-harvest performance of the flexible hose net2020

    • Author(s)
      Qiao Li, Yue Li, Yoichi Mizukami, Shuchuang Dong, Takero Yoshida, Daisuke Kitazawa
    • Journal Title

      Proceedings of the ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering

      Volume: OMAE2020-18513

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Experimental Study on the Motion of a Flexible Hose Net Used in Automated Net-hauling System2019

    • Author(s)
      Yue Li, Yoichi Mizukami, Qial Li, Takero Yoshida, Jialin Han, Daisuke Kitazawa
    • Journal Title

      Proceedings of the ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering

      Volume: OMAE2019-95670

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] 定置網漁業の自動魚群誘導システムの性能実験2021

    • Author(s)
      古市大剛
    • Organizer
      古市大剛, 李僑, 水上洋一, 北澤大輔
    • Related Report
      2020 Annual Research Report
  • [Presentation] Experimental study on fish-harvest performance of the flexible hose net2020

    • Author(s)
      Daisuke Kitazawa
    • Organizer
      the ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering
    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study on the Performance of the Flexible Hose Net used in Automated Net-hauling System2019

    • Author(s)
      Yue Li
    • Organizer
      令和元年日本船舶海洋工学会秋季講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Experimental Study on the Motion of a Flexible Hose Net Used in Automated Net-hauling System2019

    • Author(s)
      北澤大輔
    • Organizer
      the ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Flotation and submersion of set net and cages2018

    • Author(s)
      北澤大輔
    • Organizer
      Aquaculture Students Presentation, Universidad Catolica del Norte
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 定置網漁業の自動魚群誘導システム

    • URL

      http://mefe.iis.u-tokyo.ac.jp/research.html

    • Related Report
      2020 Annual Research Report

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

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