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Study on steady wave forces and the moment acting on drifting ships and the effects on the prediction of ship manoevring motion in waves.

Research Project

Project/Area Number 20K04947
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionNational Institute of Maritime, Port and Aviation Technology

Principal Investigator

Suzuki Ryosuke  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, 主任研究員 (20711328)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords船舶海洋工学 / 船舶操縦性能 / 操縦運動計算 / 波浪中操縦性能 / 波浪中抵抗増加 / 定常波力
Outline of Research at the Start

本研究では、船体斜航時の定常波力(操縦運動による出会角等の変化に伴い、ゆっくりと変化する波力成分を示す)の変化ならびにそれが操縦運動推定に与える影響を定量的に明らかにしたうえで、既存の手法を基に斜航時の定常波力を適切に評価し得る計算法を提案し、低速航行時の実船を対象とした波浪中操縦運動推定法を構築する。

Outline of Final Research Achievements

In this study, first, we evaluated the influence of ship’s lateral drift on wave-induces steady longitudinal and lateral forces and yaw moment quantitatively via captive model tests in a basin. Second, we investigated the influence of the variation of the wave-induced steady forces due to the ship’s lateral drift on ship manoeuvring based on numerical simulation using a conventional manoeuvring model for a ship in calm water with the measured wave-induced steady forces. Third, we developed a new prediction method of the wave-induced steady forces acting on a obliquely moving ship in short waves by improving the existing method. The developed method was validated based on the wave-induced steady forces measured in the captive model tests and manoeuvring motions measured in free-running model tests. As a result, we clarified that the developed method is promising to evaluate ship’s manoeuvrability in waves.

Academic Significance and Societal Importance of the Research Achievements

これまでの定常波力に関する研究は、実験的にも理論的にも船体が直進状態であることを仮定したものが殆どであった。そのため、本研究で示した斜航状態における定常波力の実験値の希少性は高く、またこれは本研究で構築した計算法のためだけでなく、これからは開発される斜航状態を対象とした様々な定常波力推定法の検証に役立つことから、学術的に大変意義がある。本研究で構築した定常波力の推定法についても、既存の手法をベースとしながらも、その推定精度が向上したことで、波浪中において船が備えるべき操縦性能をより妥当に評価することが可能になった。従って、本成果は、船舶の航行安全性に大きく貢献するものである。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Effects of steady wave forces on course-keeping manoeuvres of full- and model-scale ships moving obliquely in short waves2022

    • Author(s)
      Ryosuke Suzuki, Yoshiaki Tsukada, and Michio Ueno
    • Journal Title

      SHIP TECHNOLOGY RESEARCH (SCHIFFSTECHNIK)

      Volume: 未定 Issue: 3 Pages: 190-208

    • DOI

      10.1080/09377255.2022.2149094

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Prediction of Steady Wave Forces and Moment Acting on Ships Manoeuvring in Short Waves (Accepted)2023

    • Author(s)
      Ryosuke Suzuki and Michio Ueno
    • Organizer
      The 33rd International Ocean and Polar Engineering Conference (ISOPE2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of steady wave forces for oblique motion on estimation of manoeuvers of full-scale ships2022

    • Author(s)
      Ryosuke Suzuki, Yoshiaki Tsukada, and Michio Ueno
    • Organizer
      15th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 短波長波中を斜航する船に働く定常波力推定法について2022

    • Author(s)
      鈴木良介, 塚田吉昭, 上野道雄
    • Organizer
      日本船舶海洋工学会 令和4年 秋季講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 実船の操縦運動推定に対する波漂流力の影響に関する一考察2020

    • Author(s)
      鈴木良介
    • Organizer
      第20回研究発表会講演集(ポスターセッション)
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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