基于LS-dyna的平台定位系统结构强度数值计算方法

Numerical calculation method for structural strength of platform positioning system based on LS-dyna

浮动堆平台采用小堆型式用于海上发电,为采油平台等海上设施提供电力能源和热水资源,其定位系统能保证浮动平台抵御风浪流的恶劣海况从而稳定的漂浮于海上。结合浮动平台运动特点,分析定位系统固有特性,提出一种以水动力计算得到船体位移,基于LS-dyna显示动力学建立整体刚柔耦合模型的分析方法。以船体位移作为输入对结构进行动力学耦合计算,分析各系统模块、运动副受力,得到关键部位和运动副的应力时程曲线以及关键节点的位移时程曲线,并给出各运动副最大受力时的运动姿态的计算方法,为工程应用提供了参考。

The floating stack platform adopts a small stack type for offshore power generation,and provides power energy and hot water resources for offshore facilities such as oil production platforms.Its positioning system can ensure that the floating platform can withstand the harsh sea conditions of wind and waves and thus float stably at sea.Combining the motion characteristics of the floating platform and analyzing the inherent characteristics of the positioning system,an analytical method for hull displacement based on hydrodynamic calculation and an overall rigid-flexible coupling model based on LSdyna is proposed.The kiln displacement is used as input to calculate the dynamic coupling of the structure,and with analyzing the force of each system module and motion pair,it can obtain the stress time history curve of key parts and motion pairs.And the calculation method of the motion posture of each motion pair is given,which provides a reference for engineering application.