自由動揺に対する水面上形状の影響とメモリー影響関数

概要

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A good many researchers have proposed a many kinds of calculation methods for nonlinear hydrodynamic of a floating body in waves so far. These kinds of methods have, however, some problems such as much consuming computer time and a large memory storage even now. We therefore have to develop a rational calculation method instead of these methods from a practical point of view. In this paper, we investigate characteristics of memory effect function which is useful for estimating non-linear hydrodynamic forces on a body oscillating with a large amplitude on a calm water. Then we propose a rational calculation method for a memory effect function by applying a spline function along some few exact values from a practical point of view. This method can be easily applied to 3-dimensional problems. Furthermore we estimate hydrodynamic forces on a triangular cylinders and a home-base shape cylinder, which have a same wetted section and different flare-shapes. Finally we obtain numerical time histories of free heaving oscillations of two triangular cylinders with different flare-shapes. By comparing these numerical results and experimental results, we investigate effect of flare-shapes on hydrodynamic forces and free heaving oscillations.
社団法人日本船舶海洋工学会の論文
1990-08-26