1995 Fiscal Year Final Research Report Summary
The Development of the Measurement Instrument on Water Waves
| Project/Area Number |
05555271
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
海洋工学
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| Research Institution | OSAKA UNIVERSITY |
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Principal Investigator |
NAITO Shigeru OSAKA UNIV., Dept.of NAOE Professor, 工学部, 教授 (20093437)
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| Co-Investigator(Kenkyū-buntansha) |
MORI Atsuhiko Engineering.Co., President, Researcher, 所長(研究員)
TAKAGI Ken OSAKA UNIV., Dept.of NAOE Assoc.Professor, 工学部, 助教授 (90183433)
SUZUKI Toshio OSAKA UNIV., Dept.of NAOE Professor, 工学部, 教授 (80029107)
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| Project Period (FY) |
1993 – 1995
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| Keywords | Transmitted Light / Unsteady Wave Field / Wave Amplitude Function / Image Processing / Relative Bow Motion |
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| Research Abstract |
The followings are the research results during the period of this project.
1. It is necessary for this research project to synchronize the moving coordinate with the space fixed coordinate exactly. In order to do it, the accuracy of speed of the towing carriage in the small water tank and period of radiation motion must be high. By using the synchronized time, the relation, that indicates phase difference, between an incident wave and the ship motion has been able to be identified. With this developed system our experiments has been carried out efficiently.
2. An unsteady wave field, which was generated by a ship with oscillating advanced velocity, was measured with the video system on the space fixed coordinate. Those data must be translated to the data on the moving coordinate system. This data transportation analysis method has been established.
3. By using the measurement instrument, it turned out to be possible to measure the very concentrated wave, that is the impulsive wave.
4. By using the system, the experimental method to obtain relative motion between wave surface and the ship body in regular and/or irregular waves was probed.
5. The experimental and analyzed system to obtain the wave amplitude function of a ship by measuring the unsteady or steady wave fields on video tape has been established.
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