筏体和基础弹性对设备冲击响应影响的有限元分析

Effect on Non-linear Shock Response of Shipboard Equipment Caused by Elasticity of Raft Body and Base

带有限位器的浮筏隔振系统是非线性系统,利用ANSYS建立了这一非线性系统的有限元模型,计算了带有限位器的浮筏隔振系统模型的冲击响应,分析了筏体弹性、基础弹性和限位器参数对冲击响应的影响。计算结果表明筏体弹性和基础弹性对系统的冲击响应均有一定程度的影响,它们使得机组的最大加速度响应减小,筏体和机组的最大位移响应增大。对于刚性浮筏隔振系统和弹性浮筏隔振系统,限位器间隙与冲击响应之间的关系是相同的,即随着限位器间隙的减小,筏体和机组的最大加速度响应增大,而最大位移响应都减小。

The finite element models of the shipboard equipment using shock isolator with displacement restrictor are established by ANSYS. Non-linear shock responses of the shipboard equipments are calculated by FEM. The effect on non-linear shock response of shipboard equipment caused by elasticity of raft body and base with different working clearance of the displacement restrictor is analyzed. The computed results show that the elasticity of raft body and base decreases the maximum acceleration of equipments and increases the maximum displacement of equipments and raft body. For elastic and rigid raft isolation system, the relations between the working clearance of the displacement restrictor and the shock response are the same. As the working clearance decreasing, the maximum acceleration of raft body and equipments increases, and their maximum displacement decreases.