波浪中で船体が受ける横剪断力, 横曲げモーメントおよび捩りモーメントの計算

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This paper deals with a method of the theoretical calculation of the lateral wave loads (i.e.shear force, bending moment, and torsional moment) acting on ship's hull in oblique regular waves. The strip theory utilizing the hydrodynamic coefficient obtained by Tasai's theory is applied to this method, and a correction is made on the viscous roll-damping coefficient. In the calculation of torsional moment, the effect or shear center height is considered. The longitudinal distributions of lateral wave loads exerting on a typical snip model are shown herein. Then comparisons are made between the calculated values and the data of experiments carried out at several model basins. The calculated and measured values of the lateral wave loads-especially, of the lateral shear force and lateral bending moment-are in good agreement with each other. However, the calculated values of the torsional moment are, in some cases, slightly different from the measured values. This calculation method seems to be practical in predicting the lateral wave loads as a preliminary design stage routine, though it is necessary to obtain more accurate evaluation of distribution of roll-damping moment and transverse moment of inertia along the ship's longitudinal axis.
社団法人日本船舶海洋工学会の論文