浅水時操縦流体力微係数の簡易計算法に関する一検討

概要

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A simplified method to predict the maneuvering hydrodynamic forces in shallow water has been developed by Hirano and others. In the method, it is assumed that the ship hull can be replaced by a flat plate. And shallow water effect on the hydrodynamic forces is expressed by using infinite images of the flat plate. Further, for simplification, the flat plate is represented by a single discrete vortex whose strength is constant across the span. Here, the vortex is placed at the quarter chord, and the boundary condition is satisfied at the three-quarter chord. On the contrary, the author proposes a method in which the vortex is placed at the leading edge, and the control point at the center of the chord. Calculated values of linear force derivatives with respect to drift angle, which are obtained from both the methods, are compared with experimental results. In general, the latter method gives better agreement with the experimental results than the former method when a correction is made for strength of the concentrated vortex.
2000-03-25