Abstract A piecewise linear vibration isolator used to isolate the rocket launch vibration is proposed and investigated in this paper. The dynamic characteristics of the piecewise linear vibration isolator are analyzed theoretically and experimentally. Assuming base excitation from the rocket, the dynamic equation is established and the response is solved by using averaging method. The influence of the system parameters such as stiffness ratio and clearance distance on the system performance is discussed. The jumping phenomenon and frequency shift are observed. The vibration isolation performance of the isolator is tested by using vibration table to simulate the launch vibration loads according to certain criterion. The theoretical and experimental results are compared and are in good accordance. The results show that the piecewise linear vibration isolation system can lower the response for large amplitude vibration excitation at launch. The results present here can be a useful guideline when design such kind of vibration isolator.

中文翻译：

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发射隔离器的性能：理论和实验研究

摘要 本文提出并研究了一种用于隔离火箭发射振动的分段线性隔振器。从理论上和实验上分析了分段线性隔振器的动态特性。以火箭为基础激发，建立动力方程，采用平均法求解响应。讨论了刚度比和间隙距离等系统参数对系统性能的影响。观察到跳跃现象和频移。隔振器的隔振性能是根据一定的判据通过振动台模拟发射振动载荷来测试的。理论和实验结果进行了比较，符合良好。结果表明，分段线性隔振系统可以降低发射时对大振幅振动激励的响应。在设计此类隔振器时，此处提供的结果可以作为有用的指导。