2007 Fiscal Year Final Research Report Summary
On the Reduction of Roll Motion and the Optimization for the Floating Unit of a Floating Wind Power Plant
| Project/Area Number |
18560773
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Tokai University |
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Principal Investigator |
SUNAHARA Shunji Tokai University, School of Marine Science and Technology, Associate Professor (40276788)
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| Co-Investigator(Kenkyū-buntansha) |
SEKITA Kinji Tokai University, School ofMarine Science and Technology, Professor (90287045)
OHKAWA Yutaka National Maritime Research Institute, Ocean Engineering Department, Associate Professor (20399520)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Floating Wind Power Plant / Motion Properties in Waves / Fin Stabilizer for Motion Deduction / Optimization of Moorine System |
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| Research Abstract |
Af loating wind turbine platform concept is being developed for realization a large-scale wind power plant at open sea This wind power plant is comprised of a lot of box-girder type floating units. The floating unit mounts two 5, 000kW wind turbines, and polyester mooring ropes and vertical loading anchors are applied in the mooring system of the floating unit It is significant to reduce the roll motion of the floating unit in beam seas for decreasing of the inertia moment of a wind turbine and not lowering the generation efficiency.
In this project, several types of horizontal fin stabilizers installed under hull girders of the floating unit were proposed, to reduce the roll motion without increasing of influences on a mooring system, such as the wave exciting moment or the wave drift moment And the effect of the fin stabilizers on the motion reduction and the influences on the mooring system were investigated by model tests.
Forced oscillation tests in still waters were performed and added inertia moments and damping moments were obtained. And wave loads tests in regular waves were made to obtain the wave exciting moments and the wave drift moments. As a result of these tests, it was confirmed that a high effect on motion reduction is obtained without noticeable increasing of the wave loads in case large-area fin stabilizprs are installed deeply under hull girders. Furthermore analysis of a mooring system was made, with the result that the floating unit with the horizontal fin stabilfrers can be moored technically at open sea.
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