| Project/Area Number |
02452185
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶抵抗・運動性能・計画
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| Research Institution | UNIVERSITY OF TOKYO |
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Principal Investigator |
MAEDA Hisaaki UNIVERSITY OF TOKYO, INSTITUTE OF INDUSTRIAL SCIENCE, PROFESSOR, 生産技術研究所, 教授 (80013192)
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| 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)
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1992: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1990: ¥4,100,000 (Direct Cost: ¥4,100,000)
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| Keywords | Semi-Submersible / Stability / Safety / Capsizing / Combined Environmental Forces / Life Raft / Wind, Wave, Current / Multi-Directional Waves / セミサブリング |
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| 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.
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