被撞船刚体运动响应的滞后特性

船舶碰撞过程中，被撞船的刚体运动较之碰撞区的局部损伤变形存在一定程度的滞后。本文以理论分析和数值仿真两种方法对该滞后现象进行了研究。提出了运动滞后分析的基本假定和计算公式。研究结果表明，被撞船的运动滞后与撞击速度有重要关系，在高速撞击时，船舶碰撞的内、外部机理计算可相对独立地进行而不会引起明显的分析误差。

Motion Lag of Struck Ship in Collision

The rigid body motion of struck ship in collision is delayed to a certain extent, compared with local damage deformation of collision zone. The motion lag of struck ship has been evaluated by a simplified analytical method based on momentum transfer analysis and calibrated by dynamic fluid-structure coupling F. E. simulation technique. It is concluded that the motion lag of struck ship is obvious in high speed collisions, and then the intemal and external mechanism of ship collision could be treated separately, while colli sion damage of struck ship can be analyzed on a local structural model.