1991 Fiscal Year Final Research Report Summary
Research on the Offshore Structures for Deep Seas
| Project/Area Number |
01045013
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | University-to-University Cooperative Research |
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| Research Institution | Yokohama National University |
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Principal Investigator |
TAKEZAWA Seiji Yokohama National University, Professor, 工学部, 教授 (10017874)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIMOTO Kazuo University of Saopaulo, Associate Professor, 工学部, 助教授
TANIGUCHI Celio University of Saopaulo, Professor, 工学部, 教授
TACHIBANA Toshi-ichi University of Saopaulo, Professor, 工学部, 教授
HIRAYAMA Tsugukiyo Yokohama National University, Professor, 工学部, 教授 (00018061)
INOUE Yoshiyuki Yokohama National University, Professor, 工学部, 教授 (60126373)
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| Project Period (FY) |
1989 – 1991
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| Keywords | Offshore Structures / Deep Seas / Floating Type / Mooring System / Short Crested Irregular Waves / 短波頂不規則波 |
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| Research Abstract |
This joint research was organized between Japan and Brasil for the estimation of performance of floating offshore structures for deep seas, concerning to the development of ocean, especially for development of oil field in deep seas.
For the first year study, we discussed on the way of conducting joint research, and inspected into the oil field off Brasilian coast.
For the second year, we developed calculation model for estimating dynamic performance of offshore structures for deep sea considering the combined effect of wind, wave, current and mooring lines. We also conducted tank experiment for examining numerical calculation, and added model experiments in directional spectrum waves.
For the final year, we continued the numerical calculation in long crested irregular waves and conducted experiments in directional spectrum waves.
From the experiments in directional spectrum waves, estimation method of directional response function was studied.
Summarizing the three years joint research, we obtained following main results.
(1) Estimation of performance in waves of offshore structures for deep seas is possible.
(2) Directional response function can be estimated from the measured results on motion in directional spectrum waves.
(3) Motion responses in directional spectrum waves have a tendency to be decreased as the directional spreading become large.
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