| Project/Area Number |
18560774
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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 | Kanazawa Institute of Technology |
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Principal Investigator |
MASUYAMA Yutaka Kanazawa Institute of Technology, College of Engineering, Professor (10101362)
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| Co-Investigator(Kenkyū-buntansha) |
FUKASAWA Toichi Kanazawa Institute of Technology, College of Engineering, Professor (80143171)
TAHARA Yusuke Osaka Prefecture University, College of Engineering, Associate Professor (10264805)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | maritime safety / naval architecture / prevention of capsizing / motion of boat / sailing yacht / dynamic stability / rolling / full-scale test |
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| Research Abstract |
In September 2003, a 6.45m length over all sailing cruiser capsized and sunk just after tacking maneuver operation at the Lake Biwa in Japan. The reason of this accident is considered that the heeling moment due to sudden loading of the wind just after tacking maneuver exceeded dynamic stability of the boat. In this research, dynamic stability and possibility of capsizing by sudden loading of the wind are investigated for small ocean sailing yachts.
Damping coefficients and added moments of inertia of the hull and sail were obtained experimentally using a full-scale boat and a scaled model. Then numerical calculation methods were employed to obtain the steady sail performance and to evaluate the effect of dynamic rolling motion on the sail performance using vortex lattice method and NS/RaNS based CFD method.
A numerical. simulation method was proposed to calculate the rolling motion of the boat due to sudden loading of the wind, and time histories of rolling motion up to capsizing of the boat were estimated. The simulated results agreed well with the capsizing model test. The estimated threshold wind velocity for capsizing was also coincided with the wind condition at the accident.
The principal dimensions of relative small sailing cruisers were investigated and three typical boat configurations were created from these data. The numerical simulation method was adopted for these boats to estimate the threshold wind velocity for capsizing. From this analysis, the effect of crew weight on the boat was clarified, and a chart for Displacement to threshold wind velocity for capsizing was established. This chart will be used for prevention of capsizing of small ocean sailing yachts.
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