半潜式海洋平台与供应船尾部发生正碰分析

Simulation analysis of the frontal collision between semi-submersible platform and stern of the supply ship

随着世界上海洋平台的增多,船舶与海洋平台的碰撞事故也随之变多,碰撞事故往往产生巨大损失。为了研究其碰撞规律,本文基于有限元软件Ansys/Ls-Dyna,研究分析不同速度下供应船尾部与半潜式海洋平台的碰撞,碰撞中的流体采用附加质量法处理。为确保计算结果精度,对碰撞的局部区域进行网格细化。计算结果表明,正碰时平台内部结构单元首先发生破坏(内部结构指水平强框处单元),外板失效所需能量比内部结构大;当撞击速度小于破坏速度时,单元没有破坏,但当船回弹时,外板上的板单元产生振动,应力和能量产生短时间波动。

Due to the increase of the ocean platforms, the frequency of collision between ship and platforms becomes more and more high, causing huge losses. In order to study the law of collision between ship and platform, this paper, based on the finite element software Ansys/LS-DYNA, studying on the collision between ocean platform and stern of ship in differ- ent speed, fluid in collision is treated in the way of additional mass. Local area of collision is conducted mesh refinement in sure of the accuracy of computation. The result show that the internal structural unit of the platform is destroyed first when frontal collision happens, outer panel need more energy than internal structure when unit fail. When impact velocity is less than failure velocity, unit is not destroyed. However, when ship springs back, unit of outer panel will vibration, stress and en- ergy will have short-time fluctuate.