スプラッシュを考慮した簡便な衝撃圧解析

概要

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When ships cruise through rough sea, hull-bottom and deck-flare region are subjected to high impact pressure due to slamming. In ship's structural design, wave impact is an essential phenomenon and correct estimation of this impact pressure is very important. Theoretical prediction of the above impact load for simple but primitive wedge-entry model has been carried out by different authors since the first half of this century. However, in solving wedge entry problem by B.E.M., it is necessary to determine the self-similar free surface taking account of splash. In the present analysis, expressing the effect of splash on impact pressure by the velocity of water at splash root and the volume of splash and approximating the shape of free boundary surface, a simplified method of determination of the shape of free surface is proposed. For small values of deadrise angle, the above impact pressure distribution over the wedge, calculated by the above proposed method, tallies fairy well with Wagner's theoretical values. However, for higher values of deadrise angle, present analysis is very close to Hughes' numerical results.
社団法人日本船舶海洋工学会の論文