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Investigation into dynamic progressive collapse behavior of hull girders in waves using hydro-elastoplastic approaches

Research Project

Project/Area Number 19K15219
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionOsaka University

Principal Investigator

Tatsmi Akira  大阪大学, 工学研究科, 助教 (60736487)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords流力弾塑性 / 縦曲げ崩壊 / 崩壊後挙動 / FE/Smith法 / 弾性相似模型 / リスク評価 / 動的崩壊応答 / 弾性相似模型船 / 静水中応答 / 波浪中動的崩壊応答 / 水槽試験 / 動的崩壊挙動 / 船体構造 / 縦曲げ最終強度 / スミス法
Outline of Research at the Start

波浪中の船体には縦曲げモーメントが作用する。縦曲げモーメント(荷重)が縦曲げ最終強度(強度)を超過した場合、船体は折損する。しかし、波浪中において船体がどのような応答を伴って崩壊に至るかは未解明である。その応答をシミュレートするためには、崩壊後の構造と流体の連成を考慮した、船体の流力弾塑性解析が必要である。詳細な流力弾塑性解析は数値流体力学(CFD)や有限要素法(FEM)により原理的には可能であるが、計算には膨大なコストが必要である。そこで,本研究課題では上記の詳細解析に加え、船体の基本設計段階で使用可能な流体構造連成影響を考慮した実用的船体動的崩壊解析法の開発を目指す。

Outline of Final Research Achievements

When wave load exceeds hull-girder ultimate strength in extreme sea states, hull-girder bending collapse is occurred. To perform a risk assessment for the hull-girder collapse, a hydro-elastoplastic analysis which can consider fluid-structure interaction in post-collapse regime is needed. Therefore, a practical method to analyze dynamic progressive collapse behaviors/response of the hull girder have been developed. In the proposed method, Smith’s method is incorporated with beam finite element method while hydro-dynamic load is estimated based on strip theory. The proposed method has been validated through comparisons with an experiment of a scale model ship in a towing tank and more detailed numerical simulation. After the validation work, the proposed method was applied to a real ship, and important findings about the dynamic progressive collapse response of the hull girder in waves have been obtained.

Academic Significance and Societal Importance of the Research Achievements

スミス法に従って船体断面の逐次崩壊を考慮しつつ,波浪中における船体全体の動的崩壊応答を解析できる流力弾塑性手法を開発した点で新規性が高い.また,提案手法は汎用のPCであっても数分程度で波浪中の動的逐次崩壊の解析を行うことができ,実用性も高いと考える.提案手法は,作用荷重が船体の縦曲げ最終強度を超過した場合のリスク評価を行うにあたって,非常に有用な解析ツールとなるであろう.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2022 2020

All Journal Article (5 results) (of which Peer Reviewed: 2 results)

  • [Journal Article] 流力弾塑性梁モデルを用いた船体桁の動的崩壊解析 -第2報:波浪中崩壊応答解析への拡張-2022

    • Author(s)
      辰巳晃,飯島一博,藤久保昌彦
    • Journal Title

      日本船舶海洋工学会講演会論文集

      Volume: 32 Pages: 329-335

    • NAID

      40022809256

    • Related Report
      2021 Annual Research Report
  • [Journal Article] 非線形梁有限要素法とアンサンブルカルマンフィルタを用いた船体の積載荷重の逆推定2022

    • Author(s)
      辰巳晃,飯島一博,藤久保昌彦
    • Journal Title

      日本船舶海洋工学会

      Volume: 32 Pages: 131-138

    • NAID

      40022808752

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Estimation of still-water bending moment of ship hull girder using beam finite element model and ensemble Kalman filter2022

    • Author(s)
      Akira tatsumi, Kazuhiro Iijima, Masahiko Fujikubo
    • Journal Title

      Proceedings of the ASME 2022 41th International Conference on Ocean, Offshore and Arctic Engineering

      Volume: -

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Collapse Analysis of Ship Hull Girder Using Hydro-Elastoplastic Beam Model: Part 22020

    • Author(s)
      Ko Han Htoo Htoo、Tatsumi Akira、Iijima Kazuhiro、Fujikubo Masahiko
    • Journal Title

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

      Volume: Volume 2B

    • DOI

      10.1115/omae2020-19201

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] 流力弾塑性梁モデルを用いた船体桁の動的崩壊解析ー詳細FEMとの比較を通じた検証ー2020

    • Author(s)
      辰巳晃,齋賀大和,Han Htoo Htoo Ko,飯島一博,藤久保昌彦
    • Journal Title

      日本船舶海洋工学会講演会論文集

      Volume: 30

    • NAID

      40022395684

    • Related Report
      2020 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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