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Influence of the nonlinearities in waves, ship-motions, and ship-structure-responses on the expected maximum load on the ship's life

Research Project

Project/Area Number 21H01538
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

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

Co-Investigator(Kenkyū-buntansha) 高見 朋希  国立研究開発法人海上・港湾・航空技術研究所, 海上技術安全研究所, 主任研究員 (50586683)
松井 貞興  国立研究開発法人海上・港湾・航空技術研究所, 海上技術安全研究所, 主任研究員 (60734225)
小森山 祐輔  国立研究開発法人海上・港湾・航空技術研究所, 海上技術安全研究所, 研究員 (90805110)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2021: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
KeywordsHOSM / FORM / 非線形波 / 極値推定 / 弾性模型船 / 最大荷重 / 弾性模型 / 非線形 / 最大応答 / スペクトル形状 / 変調不安定
Outline of Research at the Start

波の変調不安定現象や、高波高中の船体運動・構造応答の非線形性が、船の生涯最大波浪荷重の期待値に及ぼす影響を明らかにすることを本研究の目的とする。そのために、変調不安定を考慮した非線形な波浪中の船体運動・構造応答計算プログラムの開発、弾性模型船による波浪中水槽試験を実施し、それらの影響を詳細に調べる。また、海象を標準スペクトルで表現することの妥当性を、実船モニタリングデータから検証する。さらに、開発した数値手法をベースに、生涯最大波浪荷重期待値の合理的な推定手法を開発する。

Outline of Final Research Achievements

A time-domain nonlinear strip method for simulating ship response to nonlinearly evolving waves, called “NMRIW-II-HOSM”, has been developed. The numerical simulation of the response of a container ship to long-crested irregular waves showed that not only the body nonlinearity but also the wave nonlinearity can affect the extreme value distributions of the sagging moment. Furthermore, a method called HOSM+FORM was developed to estimate such extreme values of the ship response together with their probability of occurrence. The introduction of a surrogate model of the nonlinear ship response enables the extreme value estimation of the ship response to take into account the nonlinearities in both the wave and the ship response. This extreme value estimation method was verified by a tank experiment using aflexible acrylic ship model.

Academic Significance and Societal Importance of the Research Achievements

波の非線形発達が船体応答に及ぼす影響はまだまだ明らかでない中で、非線形発達する波の中での船体応答を計算することが可能な数値計算コードを国内で初めて開発した(国外でもわずかしか存在しない)。さらに、このような非線形波浪中の船体応答極値を確率的に推定する手法も初めて開発し、船舶・海洋構造物の設計への活用等、海上安全の実現に向けて意義のある成果と考える。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (20 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (15 results) (of which Int'l Joint Research: 9 results) Book (1 results) Funded Workshop (1 results)

  • [Journal Article] Combination of HOSM and FORM for extreme wave-induced response prediction of a ship in nonlinear waves2023

    • Author(s)
      Takami Tomoki、Fujimoto Wataru、Houtani Hidetaka、Matsui Sadaoki
    • Journal Title

      Ocean Engineering

      Volume: 286 Pages: 115643-115643

    • DOI

      10.1016/j.oceaneng.2023.115643

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Stereo Reconstruction Method for 3D Surface Wave Fields around a Floating Body Using a Marker Net in a Wave Tank2023

    • Author(s)
      Higuchi Yuya、Houtani Hidetaka、Goncalves Rodolfo T.、Yoshimura Yasuo、Hirabayashi Shinichiro、Suzuki Hideyuki、Orihara Hideo
    • Journal Title

      Journal of Marine Science and Engineering

      Volume: 11 Issue: 9 Pages: 1683-1683

    • DOI

      10.3390/jmse11091683

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Phase Convergence and Crest Enhancement of Modulated Wave Trains2022

    • Author(s)
      Houtani, H.; Sawada, H.; Waseda, T.
    • Journal Title

      Fluids

      Volume: 7(8) Issue: 8 Pages: 275-275

    • DOI

      10.3390/fluids7080275

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Pressure field evaluation beneath nonlinear waves using the higher-order spectral method and its application to ship response simulations2023

    • Author(s)
      Hidetaka Houtani
    • Organizer
      Workshop on Nonlinear Water Waves and Related Topics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical investigation of the statistics of vertical bending moments of ships in nonlinearly evolving irregular waves2023

    • Author(s)
      Houtani, H., Fujimoto, W. & Matsui, S.
    • Organizer
      ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Extreme Wave and Vertical Bending Moment Predictions by Higher Order Spectrum Method and FORM2023

    • Author(s)
      Takami, T., Fujimoto, W., Houtani, H. & Matsui, S.
    • Organizer
      ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] マーカーネットを用いた浮体周辺波浪場の面的計測2023

    • Author(s)
      樋口湧也,宝谷英貴,Rodolfo T Goncalves,芳村康男,平林紳一郎,鈴木英之,折原秀夫
    • Organizer
      日本船舶海洋工学会令和5年春季講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Extreme Wave and Wave-induced Vertical Bending Moment Predictions in Higher Order Spectrum Waves using FORM2023

    • Author(s)
      Takami, T., Fujimoto, W., Houtani, H. Matsui, S.
    • Organizer
      日本船舶海洋工学会令和5年春季講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Nonlinear processes in crest enhancement of modulated wave trains2023

    • Author(s)
      Houtani, H.
    • Organizer
      The two-day workshop on Recent Advances in Nonlinear Water Waves
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Predictions of extreme waves and ship responses based on HOSM + FORM2023

    • Author(s)
      Takami, T.; Fujimoto, W.; Houtani, H.; Matsui, S.
    • Organizer
      Research Meeting at National Maritime Research Institute
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical investigation of ship VBM response statistics in nonlinear waves using HOSM outputs2023

    • Author(s)
      Houtani, H.; Matsui, S.; Fujimoto, W.
    • Organizer
      Research Meeting at National Maritime Research Institute
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 非線形時間発達を考慮した波浪場における船体縦曲げ応答の数値計算2022

    • Author(s)
      宝谷英貴; 松井貞興; 藤本航
    • Organizer
      令和4年 日本船舶海洋工学会 春季講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] On the crest height amplification of unstable Stokes wave trains in deep water2022

    • Author(s)
      Houtani, H.
    • Organizer
      KOZWavinar #1
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高次スペクトル法による波浪内部の圧力場の数値計算2022

    • Author(s)
      宝谷英貴; 藤本航; 松井貞興
    • Organizer
      令和4年 日本船舶海洋工学会 秋季講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 時間周期的および空間周期的な変調不安定波の波形の一致と分散関係の偏移2022

    • Author(s)
      宝谷英貴
    • Organizer
      海洋波および大気海洋相互作用に関するワークショップ
    • Related Report
      2021 Annual Research Report
  • [Presentation] Influence of Initial Wave Steepness of Modulated Wave Trains on the Maximum Crest Height2021

    • Author(s)
      Houtani, H.; Waseda, T.; Sawada, H
    • Organizer
      36th International Workshop on Water Waves and Floating Bodies
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 波の変形と船体縦曲げ応答について2021

    • Author(s)
      宝谷英貴; 早稲田卓爾
    • Organizer
      令和3年 日本船舶海洋工学会 春季講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] On the maximum crest height of modulated wave trains2021

    • Author(s)
      Houtani, H
    • Organizer
      Online Seminar on Nonlinear Water Waves and Related Topics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Book] Chapter 10 - Application 1: ship responses to freak waves2023

    • Author(s)
      Hidetaka Houtani
    • Total Pages
      224
    • Publisher
      Elsevier
    • ISBN
      9780323917360
    • Related Report
      2023 Annual Research Report
  • [Funded Workshop] Research Meeting at National Maritime Research Institute2023

    • Related Report
      2022 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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