带限位隔振系统冲击响应分析

为提高舰载设备的抗冲击能力,利用ANSYS中的弹簧间隙单元构建有限元模型,通过仿真计算分析限位器刚度参数对隔振系统抗冲击性能的影响,揭示二次冲击问题产生的原因并给出合理建议。研究结果表明:在任一安装间隙下,随刚度比的增加,被隔振设备的相对位移响应逐渐减小,加速度响应迅速增加,二者呈负相关;二次冲击问题不受传统限位器刚度大小影响,但通过合理选用限位器参数或设计新型大阻尼限位结构可有效改善二次冲击的影响,进而提高舰载设备的抗冲击性能。

A Shock Response Analysis of Vibration Isolation System with Displacement Restrictor

In order to improve the shock resistance of shipborne equipment,the finite element model is constructed by the spring gap unit in ANSYS.The influence of the stiffness parameters of the restrictor on the shock resistance of the isolation system is analyzed by simulation calculation.The causes of the secondary impact are revealed and reasonable suggestions are given.The results show that:the relative displacement response decreases and the acceleration response increases rapidly of the isolated equipment with the increase of the stiffness ratio,and both of them are negatively correlated under any installation clearance;and the secondary impact is not affected by the stiffness of the traditional restrictors,and can be improved effectively by rationally selecting the restrictor parameters or designing a new displacement restrict structure with large damp,thereby improving the impact resistance of the shipborne equipment.