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1992 Fiscal Year Final Research Report Summary

RESEARCH ON CAPSIZING MECHANISM OF FLOATING STRUCTURES IN COMBINED ENVIRONMENTAL CONDITIONS

Research Project

Project/Area Number 02452185
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 船舶抵抗・運動性能・計画
Research InstitutionUNIVERSITY OF TOKYO

Principal Investigator

MAEDA Hisaaki  UNIVERSITY OF TOKYO, INSTITUTE OF INDUSTRIAL SCIENCE, PROFESSOR, 生産技術研究所, 教授 (80013192)

Co-Investigator(Kenkyū-buntansha) KINOSHITA Takeshi  UNIVERSITY OF TOKYO, INSTITUTE OF INDUSTRIAL SCIENCE, ASSOCIATE PROFESSOR, 生産技術研究所, 助教授 (70107366)
Project Period (FY) 1990 – 1992
KeywordsSemi-Submersible / Stability / Safety / Capsizing / Combined Environmental Forces / Life Raft / Wind, Wave, Current / Multi-Directional Waves
Research Abstract

International Maritime Organization (IMO) considered to develop a safety regulation which covers a life raft with sea-anchor, since serious fatality has occured on capsizing of large floating structures or life rafts in combined environmental conditions, such as waves, wind and current. In fact this kind of regulation is discussed without any deep insight of mechanism of capsizing. IMO guarantees the safety of large floating structures considering some margins for reserved buoyancy or taking account of full scale test of life rafts in real severe sea conditions. If the mechanism of capsizing of these floating bodies is made clear, it is possible to evaluate the absolute safety of these floating bodies in severe sea conditions, and we can develop reasonable countermeasures for capsizing of floating bodies.
In this project we developed an equation of capsize of floating bodies, and completed the computer code of behavior of floating bodies in time domain in which we take account of mutli-directional waves, line structures such as risers, second order wave excitations and nonlinear hydrodynamic forces derived from separated flow.. Finally we proposed the evaluation method of safety of life raft with sea anchor in which we pointed out the importance of wind lift force that is dominant force for capsizing.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] H.Maeda,H.J.Jo,S.Miyajima: "Behavior of a Floating Body in Multi-Directional Waves" UJNE/MFP,NOAA. 4.1-17 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宮島 省吾,趙 孝済,前田 久明: "多方向海洋波中の浮体の挙動" 生産研究、東大生研. 44. 421-424 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前田 久明: "浮遊式海洋構造物の研究の現状(その2)" 生産研究 東大生研. 44. 403-410 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前田 久明: "浮遊式海洋構造物の研究の現状(その1)" 生産研究 東大生研. 44. 395-402 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前田 久明,山崎 知巳: "海洋構造物の安全性評価" 第11回海洋工学シンポジウム 日本造船学会. 231-238 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Maeda,H.J.Jo,S.Miyajima: "EFFECTS OF DIRECTIONAL WAVES ON THE LOW-FREQUENCY MOTIONS OF MOORED FLOATING STRUCTURES" ISOPE'92. 3. 489-495 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小山 健夫,藤野 正隆,前田 久明: "成山堂" 船体と海洋構造物の運動学(改訂版), 1-362 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Maeda, H.J. Jo, S. Miyajima: "Behavior of a Floating Body in Multi-Directional Waves" UJNR/MFP, NOAA. 4,1-17 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Miyajima, H.J. Jo, H. Maeda: "The Behavior of Floating Body in Multi-Directional Waves" SEISAN-KENKYU, IIS, UNIV. OF TOKYO.44,9. 421-424 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Maeda: "State of the Arts on Research of Dynamics of Moored Floating Offshore Structures(Part 2)" SEISAN-KENKYU, IIS, UNIV. OF TOKYO.44,9. 403-410 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Maeda: "State of the Arts on Research of Dynamics of Moored Floating Offshore Structures(Part 1)" SEISAN-KENKYU, IIS, UNIV. OF TOKYO.44,9. 395-402 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Maeda, T. Yamazaki: "Safety Assessment of Offshore Structures" Proceedings of 11th Ocean Engineering Symposium, SOCIETY OF NAVAL ARCHITECTS OF JAPAN. 231-238 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Maeda, H.J. Jo, S. Miyajima: "EFFECTS OF DIRECTIONAL WAVES ON THE LOW-FREQUENCY MOTIONS OF MOORED FLOATING STRUCTURES" ISOPE'92. 3. 489-495 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Koyama, M. Hujino, H. Maeda: Seizan-do. Dynamics of Ships and Offshore Structures,

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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