大波高波浪中における前後揺れと船体縦強度

概要

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Longitudinal ship motions have been investigated by means of the linear strip theories such as O.S.M. etc. On the other hand, the nonlinear simulation programs for longitudinal ship motion and strength have been developed for the purpose of analysis of slamming and whipping phenomena caused by hydrodynamic impact forces, and they have been successfully applied for several actual disasters to investigate real process of the disasters. In case of rough seas that may cause ship disasters, surging motions become significant, which have been experienced in model experiments and actual ship navigation. Here a difficulty arises ; the effects of surging motions have been disregarded in the previous investigations of longitudinal motion and strength. In the present paper, surging motions of a ship among elevated waves are determined step-by-step by considering instantaneous ship configurations and Froude-Kriloff forces acting on the ship ; it is performed by the use of a revised version of the nonlinear simulation program TSLAM for longitudinal ship motion and strength, since the original version is for a ship advancing with uniform speed. As results of the investigation, the increase of thrust can be calculated and compared with the previous experiments, which shows good coincidence. For the longitudinal strength, however, no significant effects appear in the present example calculations.
社団法人日本船舶海洋工学会の論文