斜浪中船舶参数横摇运动研究

Parametric rolling analysis in oblique seas

纵浪中的参数横摇是船舶耐波性领域研究热点之一,而船舶在斜浪中航行时,横摇运动同时承受外激励作用和参数激励作用,在这种参强激励作用下,也可能导致船舶大幅横摇甚至倾覆。文章考虑船、波相对位置以及垂荡-纵摇-横摇运动耦合,提出一种计算船舶回复力及耦合运动的新方法。计算结果显示,船舶在斜浪规则波下的运动呈现明显的非线性变化规律,有必要考虑回复力随船、波相对位置的变化。

When a ship sails in oblique seas, parametric rolling and the forced rolling by waves will happen at the same time, which makes the rolling angle increase fast, named as parametrically excited ship rolling. A solution to coupling ship motion equations of 3 degrees of freedom is made based on a new method to calculate restoring forces considering wave surface and ship motion. A conclusion is obtained that ship motion in oblique sea shows strong nonlinearity and it is necessary to consider the variation of restoring force due to wave surface and ship motion.