船舶碰撞后运动趋势的模拟计算

本文首先应用明诺斯基(Minorsky)一维碰撞理论,扩展为多自由度模型,描述船舶在碰撞瞬间的能量和运动的转化。以确定两船碰撞后运动的初始条件。船舶碰撞结束之后,开始进入惯性运动阶段,再以日本MMG小组提出的船舶操纵性数学模型为基础,根据基本物理定理,建立两船在互为约束条件下的运动数学模型,计算碰撞后两船的运动过程。最后,在可能出现的各种碰撞格局下进行模拟试验,确定比较符合实际的碰撞前的初始运动状态,为事故分析提供依据。研究表明,用此种模拟计算方法,能较好地计算出船舶碰撞后的运动过程,是一种分析碰撞事故的有效方法。

Computing Simulation of Ship Motional Trend after Collision

This paper extends Minorsky one-dimensional collision theory to multi freedom model, and applies this model to describe the conversion of energy to the motion at the instant of collision to determine the initial conditions of the ship motion immidiately after collision. The ship will enter inertial motion stage after collision, so a mathematical model of the ship motion accounting for their interaction effects is given out to estimate the motion process of ships after collision, which is based on the manoeuvring mathematical model proposed by the Japanese MMG group and according to some fundamental physical theorems. Finally we carried out simulation tests in response to all possible collision patterns to get proper and practical initial states of ship motion before collision, so as to provide neccessary information of accident analysis. This study shows that the computing simulation method is effective in analysing collision accidents. It is surely to work well in the estimation of ship motion after collision.