船舶高能搁浅外部动力学的数值仿真研究

基于Simonsen的假设，提出了船舶高能搁浅外部动力学的简化计算公式，并对船舶高能搁浅外部动力学过程进行了数值仿真研究。研究表明，在船舶高能搁浅动力学过程中，有相当部分的初动能转化为旋转形式的动能，包括纵摇、横摇和艏摇；不同于某些船舶碰撞问题，摩擦的影响不能忽略不计；对于船艏高能搁浅的情况，损伤路径会向船体外侧偏离，船舶与礁石之间的接触由剧烈的冲击逐渐过度到侧向挤压和滑动摩擦；相比于简化解析法，数值仿真法可以得到详细的动力学时历结果以及船体结构损伤变形图。

Numerical Simulation Research on External Dynamics of Ship's Hard Grounding

Based on Simonsen's assumption,this paper presents the simplified external dynamics formulations of ship hard grounding,and studies the process of ship hard grounding with numerical simulation.The research shows,in the process of hard grounding a considerable part of ship's initial kinetic energy turns into energy of revolving mode,which includes pitching,rolling and yawing.The effect of friction cannot be ignored,which is different to some ship collision problems.For bow hard grounding,damage path will go toward the side of ship hull,and the contact between the ship and the rock will change gradually from intense impact to lateral press and slip friction.Compared with the simplified analysis method,the numerical simulation method can obtain detailed time history results of dynamics and damage deformation pictures of ship hull structure.