船舶在规则横浪中的全局稳定性

GLOBAL STABILITY OF SHIP MOTION IN REGULAR BEAM SEA

基于非线性动力学理论 ,本文以系统运动的全局分岔为出发点 ,来探索在规则横浪中船舶倾覆的机理。应用melnikov方法 ,通过构造船舶运动的melnikov函数来获得导致船舶倾覆的海浪条件的阈值 ,从而对船舶的安全营运起到一定的指导作用。为了解决解析分析melnikov函数的难题 ,在本文中还提出了便于工程分析应用的mel nikov函数的数值算法。

Based on the nonlinear dynamics theory,the global bifurcation analysis is applied to study the mechanism of ship capsize in regular beam sea.By using Melnikov method,the Melnikov function,describing the ship motion,is constructed to find the threshold of sea condition.The result will somewhat guide the ship navigation during ship's lifetime.Furthermore,numerical analysis of Melnikov function is developed in the paper,which will facilitate the practice of Melnikov method in engineering field.