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A study on memory effect for ships manoeuvring and oscillating in waves

Research Project

Project/Area Number 17K14891
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Naval and maritime engineering
Research InstitutionNational Institute of Maritime, Port and Aviation Technology

Principal Investigator

Ryosuke Suzuki  国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (20711328)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords波浪中操縦運動 / 6自由度船体運動 / 船舶工学 / 船舶操縦性能
Outline of Final Research Achievements

The researcher developed a numerical simulation method to estimate 6 degrees-of-freedom (DOF) motion for ships manoeuvring in waves by focusing on the influence of past ship motion: memory effect, on hydrodynamic forces as the reaction of the ship motion. The researcher clarified the following points by comparison with free-running model tests conducted in this study:
1.The neglection of the memory effect by approximating the hydrodynamic forces with those at a certain frequency is possible to deteriorate estimation accuracy of ship motion.
2.Memory effect functions represented by convolution integration of impulse response functions based on a linear theory, which is common in seakeeping problems, can improve the estimation of ship motion such as wave-induced oscillation, drifting of trajectory and the time-averaged value of speed decrease by waves .

Academic Significance and Societal Importance of the Research Achievements

これまでの研究は、その簡易性から、波浪中の操縦運動や船体動揺に対する流体による反力をある1つの周波数で代表して、準定常的に扱うことがほとんどであった。本研究の様に、実験との比較からその問題点ならびに、流体反力の過去の履歴の影響度合いを具体的・定量的に示された例はほとんどない。また、開発された波浪中操縦運動計算法は、波浪中において船が備えるべき操縦性能を評価するための基礎的手法になりえる。以上により、本研究で得られた成果は意義があり、重要と言える。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (5 results)

All 2020 2019

All Journal Article (2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] 規則波中保針航時の6由度船体運動計算(掲載確定)2020

    • Author(s)
      鈴木良介、上野道雄、塚田吉昭
    • Journal Title

      日本船舶海洋工学会講演会論文集

      Volume: 第30号

    • Related Report
      2019 Annual Research Report
  • [Journal Article] 操縦性と対候性の数学モデルを統合した運動方程式による波浪中旋回時の船体運動推定2019

    • Author(s)
      鈴木良介、上野道雄、塚田吉昭
    • Journal Title

      海上技術安全研究所報告 第19回研究発表会 講演集

      Volume: 第19巻 別冊 Pages: 94-95

    • Related Report
      2019 Annual Research Report
  • [Presentation] Prediction of Manoeuvring Motion in waves for KCS Using a Unified Method (発表確定)2020

    • Author(s)
      Ryosuke Suzuki, Michio Ueno, Yoshiaki Tsukada
    • Organizer
      SIMMAN2020 workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 規則波中を旋回する船の波浪動揺と操縦運動推定計算法の一提案2019

    • Author(s)
      鈴木良介
    • Organizer
      第12回 推進運動性能研究会
    • Related Report
      2018 Research-status Report
  • [Presentation] 規則波中を旋回する船の6自由度船体運動計算2019

    • Author(s)
      鈴木良介
    • Organizer
      日本船舶海洋工学会春季講演会
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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