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Investigation of the influence of the mechanism of freak wave generation on the vertical bending response of a ship

Research Project

Project/Area Number 18K13941
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionThe University of Tokyo (2019)
National Institute of Maritime, Port and Aviation Technology (2018)

Principal Investigator

Houtani Hidetaka  東京大学, 大学院工学系研究科(工学部), 助教 (30636808)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsフリーク波 / 弾性模型 / 縦曲げモーメント / 全周造波機 / ステレオカメラ / 分布型光ファイバセンサ / 変調不安定波 / 波形状 / 光ファイバ / 準共鳴相互作用
Outline of Final Research Achievements

We analyzed the vertical bending responses of a hydro-structural container ship model in a freak wave in detail. We revealed that the maximum sagging moments acting on the ship varied depending on the relative depth of the troughs in front and behind the freak wave when the ship's length is approximately the same as the wavelength. This wave-geometry influence is because the wave-frequency components of the vertical bending moments are affected by the ship motion (notably, the pitch motion) history. We also revealed that the whipping responses are influenced by both the geometry and dynamics of a wave group that includes the freak wave. Besides, as the related experimental techniques, we reproduced an opposing sea in a wave basin in a fully directional wave basin and developed an experimental method to measure the deflection distribution of a ship model using stereo cameras and distributed fiber-optic sensors.

Academic Significance and Societal Importance of the Research Achievements

本研究課題は、船体最終強度に強く関連するテーマであった。本研究により、フリーク波に対する、もしくは短期海象中の最大縦曲げモーメントを推定する上で、波高のみを考えるのでは不十分であり、波形状を考慮する必要があることが明らかになった。このような波形状の船体構造応答への影響に関する知見は、例えば船体に作用する最大縦曲げモーメントを精度よく推定するための設計波(設計不規則波)の設定に有用であり、船体構造設計に活用され得ると考えられる。また、フリーク波形成メカニズムという科学的な議論と、船体構造応答への影響という工学的な議論を結び付けたことで、両方面からの研究の活発化が期待される。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (5 results)

All 2019

All Journal Article (2 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Invited: 2 results)

  • [Journal Article] ステレオカメラおよび光ファイバセンサによる コンテナ船弾性模型のグローバルな静的弾性変形計測2019

    • Author(s)
      宝谷 英貴、三上 航平、小林 真輝人、藤 公博、村山 英晶、鈴木 英之
    • Journal Title

      日本船舶海洋工学会講演会論文集

      Volume: 29 Pages: 433-437

    • NAID

      40022395840

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Temporal variation of modulated-wave-train geometries and their influence on vertical bending moments of a container ship2019

    • Author(s)
      Houtani Hidetaka、Waseda Takuji、Tanizawa Katsuji、Sawada Hiroshi
    • Journal Title

      Applied Ocean Research

      Volume: 86 Pages: 128-140

    • DOI

      10.1016/j.apor.2019.01.021

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Measurement of static global elastic deformation of a hydro-structural container ship model by stereo imaging and fiber optic sensing techniques2019

    • Author(s)
      Hidetaka Houtani、Kohei Mikami、Makito Kobayashi、Kimihiro Toh、Hideaki Murayama、Hideyuki Suzuki
    • Organizer
      The 2nd International Symposium On Marine Structures (ISOMS)
    • Related Report
      2019 Annual Research Report
  • [Presentation] 変調不安定波の実験的・理論的・数値的研究2019

    • Author(s)
      宝谷 英貴
    • Organizer
      非線形波動現象の数理とその応用 RIMS共同研究(公開型)
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 一体型コンテナ船弾性模型の製作とそれを用いた波浪中 船体弾性応答計測2019

    • Author(s)
      宝谷 英貴
    • Organizer
      2019年度RIOS研究講演会 実海域船舶性能評価システムの高度化と実用化に関する産学共同研究
    • Related Report
      2019 Annual Research Report
    • Invited

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Published: 2018-04-23   Modified: 2021-02-19  

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