基础与筏体弹性对双层隔振系统冲击响应的影响

Effect of Elasticity of Raft Plate and Foundation on Shock Response of Double-stage Vibration Isolation System

综合采用多刚体动力学、结构动力学、动态子结构理论,同时考虑筏板和基础的弹性,建立一个双层隔振系统的动力学新模型,编程计算了筏板、基础板取不同阶模态时系统的固有频率,并通过与有限元计算结果对比,验证理论模型的正确性。采用数值仿真方法,分析基础与筏体弹性对双层隔振系统冲击响应的影响。仿真结果表明,隔振系统的合理建模可在保证计算精度的基础上,减少分析计算的工作量,有关结论可为工程实践中双层隔振系统的计算与分析提供参考。

Based on multi- rigid- body dynamics, structural dynamics and modal synthesis method, a new model ofdouble- stage vibration isolation system with elastic raft plate and foundation is established. Program of computation iswritten for calculation of the natural frequency and shock response of the system. To prove the correctness of the model,results of the natural frequency are compared with those from FEM. Effect of elasticity of the raft plate and foundation onshock response of the double-stage vibration isolation system is analyzed with numerical simulation. As a consequence, areasonable model of double- stage vibration isolation system can save computation time and meanwhile ensure acceptablecomputation accuracy. The conclusion can be referred to deal with some practical problems of the double- stage vibrationisolation system.