基于ANSYS/LS-DYNA的示位标入水冲击仿真分析

摘要

无线电示位标投放入水时承受较大冲击载荷,可能会对其结构或内部元器件造成破坏。因缺少实际的冲击载荷参数,设计时为保证满足冲击要求留有较大的刚强度余量,增大了示位标的重量和体积,而通过有限元分析手段可以方便快速地得到较为符合实际的入水冲击载荷参数。文中将示位标假设为刚体,基于ANSYS/LS-DYNA对其入水冲击过程进行有限元建模及数值分析,得到了其以不同姿态、不同速度入水时的最大冲击加速度和冲击时间等参数,这些参数作为力学输入条件可以更好地指导示位标的结构设计。%Position indicating radio beacon gets great impact load when being put into water,maybe damaging the device structure and inner components.Because of the lack of impact load parameters when being designed,the beacon must have extra volume and weight in order to satisfy the impact requirements.However,water-entry impact load parameters can be got easily and conveniently through finite element analysis.In this paper,based on ANSYS/LS-DYNA,the finite element analysis model of the water-entry course of position indicating beacon is established on the assumption that the beacon is rigid body.Some parameters such as maximum impact acceleration and impact time were got after water-entry simulations with different speeds and gestures,which could become mechanical input parameters of structure design.