基于整体海洋平台模型的下落物体撞击数值仿真

针对海洋平台受落物撞击后的性能进行研究,采用非线性有限元数值仿真方法,探讨了落物撞击模型的建模技术和参数选取,建立了整体海洋平台模型,对落物与平台的撞击进行了数值仿真,并分析了撞击全过程,得出下落物体撞击海洋平台过程中关于碰撞力、结构损伤变形及能量转换等的一般性规律。主要结论如下：海洋平台结构的碰撞损伤变形主要表现为弹性变形,绝大部分塑性变形发生在撞击区域;海洋平台整体具有较好的弹性变形性能,能够降低下落物体撞击引起的结构损伤;建模时必须建立整个海洋平台模型,以充分体现平台结构的整体性能。

Simulation of impact load based on finite element model of offshore platform

According to the behavior of of fsho re plat form under impact load, nonlinear finite elementmetho d was adopted. The techniques of establishing mo del and the selecton o f parameters in the mo del ofdr opped object-of fsho re plat form impact w ere discussed. The whole of f shore plat form w as established w iththe pr ocess discussed. T he characteristics and conclusio ns of impact fo rce, st ructural damag e and energ yt ransfo rmat ion of fal len object s w ere investig ated. The result s show that the main defo rmat ion of the platform is elast ic, that most of the plast ic defo rmat ion co ncent rates at the impacted ar ea of the plat form andthat the off shor e plat fo rm has better f lexibility w hich can reduce the damag e o f impact . Therefor e, theplat form should be built up completely so as to ref lect the w ho le performance.