浅水時操縦微係数に及ぼす船幅影響に関する一検討
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概要
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Regarding the method to predict maneuvering derivatives in shallow water, Inoue's method, which is based on Bollay's wing theory, is available as one of the representative methods. Previously, the author improved Inoue's method by taking account of shallow water effect on trailing vortices inclination. In the improved method, vortices strength and inclination angles are determined by solving the integral equation through iterative procedure. Under the condition of finite water depth, some experiments on hydrodynamic forces due to drifting motions were conducted, employing series models with a change of the length-breadth ratio. Further, observation of trailing vortices inclination at finite depth was made by means of the dye tracer method. From these experiments concerning a flat plate model included in this series, it is clarified that the improved method gives good agreement with experimental results for hydrodynamic forces in shallow water and the ratio of inclination angle in shallow water to that in deep water. On the basis of the improved method, the author proposes a method to predict ship breadth effect on the ratio of derivatives in shallow water and in deep water. To express the thickness effect, the sources are distributed over the lifting surface of infinite images with respect to free surface and the water bottom. The source-distribution method gives almost the same tendency as experimental results for the derivatives ratio to increase with decrement of the length-breadth ratio.
- 社団法人日本船舶海洋工学会の論文
- 1987-09-30
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