船舶碰撞过程船体表面动力学数值仿真

Numerical simulation of hull surface dynamics during ship collision

为保障船舶航运安全,研究船舶碰撞过程船体表面动力学数值仿真方法。考虑船舶的尺寸参数与材料性能参数,选取随动强化模型仿真船舶材料构建船舶有限元模型;设置碰撞速度、角度与位置,材料属性,接触力、摩擦力以及水流对船体的影响等参数,采用Ansys有限元软件内的显示动力学模块求解船舶碰撞过程船体表面动力学方程与能耗耗散方程。结果表明,船舶碰撞过程中损伤通常存在于碰撞区域内,以塑性变形为主;被撞船碰撞角度一致条件下,碰撞力上限值、均值同碰撞速度间呈正比例相关;碰撞速度一致条件下,碰撞力均值同碰撞角度之间呈反比例相关;碰撞角度同碰撞时间之间成正比例相关。

There is a certain probability of ship collision in the process of ship shipping,which may cause serious maritime accidents.Therefore,in order to ensure the safety of ship shipping,the numerical simulation method of ship surface dynamics in the process of ship collision is studied.considering the ship size parameters and material performance parameters,the follow-up strengthening model is selected to simulate the ship material and build the ship finite element model;The parameters such as collision speed,angle and position,material properties,contact force,friction and the influence of water flow on the hull are set.The display dynamics module in Ansys finite element software is used to solve the hull surface dynamics equation and energy consumption dissipation equation in the process of ship collision.The results show that the damage usually exists in the collision area,mainly plastic deformation.Under the condition that the collision angle of the collided ship is the same,the upper limit and mean value of the collision force are positively proportional to the collision velocity.Under the condition of consistent collision velocity,the mean value of collision force is inversely proportional to the collision angle;The collision angle is positively proportional to the collision time.