| Project/Area Number |
09450205
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | Nagoya University |
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Principal Investigator |
MATSUI Tetsuya Nagoya Univ., Gr. School of Engng., Prof., 工学研究科, 教授 (70023083)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Kenji Toyota Nat. Inst. of Tech., Prof., 教授 (80043206)
YAMAGUCHI Masakuni Nagoya Univ., Gr. School of Engng., Assist., 工学研究科, 助手 (40283395)
OHMORI Hiroshi Nagoya Univ., Gr. School of Engng., Assoc. Prof., 工学研究科, 助教授 (90092387)
YAMADA Kouji Toyota, Nat., Inst. of Tech., Lecturer, 講師 (60273281)
HAGIWARA Nobuyuki Daido Inst. of Tech., Lecturer, 講師 (30240807)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥10,500,000 (Direct Cost: ¥10,500,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1998: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1997: ¥7,300,000 (Direct Cost: ¥7,300,000)
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| Keywords | floating offshore structure / wave / fluid force / motion response / elastic response / integral equation method / 流れ |
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| Research Abstract |
Theoretical and experimental studies have been performed to predict the hydroelastic behavior of a very large floating offshore structures (VLFS) in waves. The results of the project are summarized as follows :
1. A computer program has been developed to predict the wave-induced hydroelastic response of a VLFS by combined use of a dry-mode expansion technique and the hybrid integral-equation method.
2. Model tests have been conducted to measure the hydroelastic response of a VLFS model in a regular wave tank. The model is composed of a number of aluminum plates attached to a slitted polyethylene block to provide buoyancy. In addition to the models with different bending stiffnesses and masses, a VLFS model with a vertical wall or a horizontal submerged plates at the wave-front edge were tested to investigate the possibility of reducing the large deflection near the edge zone of the VLFS. The following conclusions were derived from the series of tests.
(a) The motion response of the VLFS model is characterized by the higher-order elastic modes. With increasing the wave frequency, the response amplitudes are reduced drastically except near the wave-front edge where the large deflection is observed.
(b) Attaching the vertical wall or the horizontal submerged plates at the wave-front edge has the effect of reducing the large deflection at the edge zone. Its effect is more pronounced with increasing the wave frequency. When the length of the VLFS exceeds five times the wave length, the response is reduced to about 2/3 to 1/2 with attaching the edge plates whose length is comparable with the draft.
(c) Satisfactory agreement is observed between theoretical and experimental predictions, confirming the validity of the proposed analytical method.
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