| Project/Area Number |
08455475
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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 |
海洋工学
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| Research Institution | Yokohama National University |
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Principal Investigator |
HIRAYAMA Tugukiyo YOKOHAMA NATIONAL UNIVERSITY,FACULTY OF ENGINEERING,PROFESSOR, 工学部, 教授 (00018061)
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| Co-Investigator(Kenkyū-buntansha) |
UENO Seiyaa YOKOHAMA NATIONAL UNIVERSITY,FACULTY OF ENGINEERING,ASSOCIATE PROFESSOR, 工学部, 助教授 (60203460)
MA Nin YOKOHAMA NATIONAL UNIVERSITY,FACULTY OF ENGINEERING,ASSOCIATE PROFESSOR, 工学部, 助教授 (30251755)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1997: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1996: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Ocean Waves / Directional Spectrum / Wave Maker / Side Wall Reflection / Directional Disttibution |
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| Research Abstract |
The estimation of responses of ship and floating structures in ocean waves, namely in short crested waves is very important, Short crested waves can be expressed by directional spectrum. For this purpose, the investigation into the characteristics of directional spectrum waves and its generation or analysis method must be needed. The basic characteristics of directional spectrum waves are confirmed through the wave generation experiments carried out Yokohama National University etc. But detailed investigation was not carried out yet. In this research, the authors carried out numerical and physical experiments and they could confirmed how to generate, how to measure and how to analyze those complicated directional spectrum waves in long or square tank. For this purpose, they developed a small derectioinal buoy and carried out validation experiments both in experimental tank and real ocean field.
Furthermore, they carried out model ship experiments in their tank for confirming the inverse estimation method of encountered directional spectrum waves through ship motions. As the numerical simulation, they considered the expression of directional wave field by the summation of waves generated by oscillating singularities. In this numerical simulation, we can realize wall effect by introducing mirror images. From such kind of experiments, we could confirmed the optimum way of generating and analyzing directional spectrum waves in the experimental tank.
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