船舶碰撞数值仿真的一种组合模型

A Simplified Model of Numerical Simulation of Ship Collisions

根据船舶碰撞的运动滞后和局部损伤特性 ,采用附连水质量处理流体—结构耦合作用 ,用详细的有限元模型表达撞击船首和被撞船侧的直接涉撞区结构 ,而将非碰撞区的船体结构以具有相应质量分布和弯曲刚度的惯性等效模型来代表 ,并将之与碰撞区的局部模型适当地联接起来 ,形成一个组合模型用于碰撞仿真计算。该组合模型不仅建模工作量小 ,而且CPU时间也大大减少。算例表明 ,组合模型与流固耦合模型的分析结果具有良好的一致性 ,可以满足一般的工程精度要求。

A model combined with detail F.E. mesh and Inertia Equivalence model for using in numerical simulation of ship collisions is introduced. In this model only the structural members in bow of striking ship and in direct collision zone of struck ship are represented by fine mesh of F.E.. The rest parts of ship hull are represented by beam element possessing equivalent mass and stiffness of ship hull girder. The behavior of structure of local collision zone and general effects of ship hull can be simulated correctly. The results of collision force and energy absorption obtained from this model have a good agreement with that from a simulation by fluid structure coupling model. It is verified that the simplified model required very simple work on building model and apparently lessens CPU time.