非線形性を考慮した波浪中の船体縦運動および縦強度 : 第3報

概要

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In the previous papers, ship's responses among waves were investigated theoretically taking account of nonlinear hydrodynamic pressure. As an example, the bottom slamming and whipping of a tanker in a ballast condition were calculated, and the pressure history was compared with a model test, which shows good agreement. In the present paper, the bow-flare slamming is investigated along the same line of thought; it may become very important for a fast container ship from the structural point of view, because it may results in a serious damage in the fore body. Assuming that the heading angle is nearly 180°, the longitudinal vertical bending moment in a container ship is investigated theoretically, ignoring rolling motion. Results obtained are as follows: 1) As for a container ship, whipping is largely influenced by the interaction of bow-flare and bottom slamming. If the time difference of these two kinds of slamming is of order of the ship's natural period of vibration, serious whipping motions may occur. 2) Whipping vibration is enlarged in case of higher wave. 3) Reduction of the ship's speed decreases the maximum whipping moment. 4) As far as the ship's rolling motion can be ignored, the maximum whipping moment is independent of the direction of waves.
社団法人日本船舶海洋工学会の論文