Grant-in-Aid for Overseas Scientific Survey.
|Section||University-to-University Cooperative Research|
|Research Institution||Yokohama National University|
TAKEZAWA Seiji Yokohama National University, Professor, 工学部, 教授 (10017874)
NISHIMOTO Ka サンパウロ大学, 工学部, 助教授
TANIGICHI Ce サンパウロ大学, 工学部, 教授
TACHIBANA To サンパウロ大学, 工学部, 教授
平山 次清 横浜国立大学, 工学部, 教授 (00018061)
宝田 直之助 横浜国立大学, 工学部, 教授 (00188103)
TANIGUCHI Ce サンパウロ大学, 工学部, 教授
井上 義行 横浜国立大学, 工学部, 教授 (60126373)
TACHIBANA Toshi-ichi University of Saopaulo, Professor
TANIGUCHI Celio University of Saopaulo, Professor
INOUE Yoshiyuki Yokohama National University, Professor
HIRAYAMA Tsugukiyo Yokohama National University, Professor
NISHIMOTO Kazuo University of Saopaulo, Associate Professor
|Project Fiscal Year
1989 – 1991
Completed(Fiscal Year 1991)
|Budget Amount *help
¥6,000,000 (Direct Cost : ¥6,000,000)
Fiscal Year 1991 : ¥2,000,000 (Direct Cost : ¥2,000,000)
Fiscal Year 1990 : ¥2,000,000 (Direct Cost : ¥2,000,000)
Fiscal Year 1989 : ¥2,000,000 (Direct Cost : ¥2,000,000)
|Keywords||Offshore Structures / Deep Seas / Floating Type / Mooring System / Short Crested Irregular Waves / 海洋構造物 / 大深度 / 浮遊式 / 着底式 / 係留システム / 短波頂不規則波 / 保留システム|
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.