参数变异的动力总成双层隔振系统强迫振动研究

Study of Parameter Variations on Forced Vibration Characteristics of a Power Pack Double-Layer Isolation System

由于机器制造、加工及材料本身物理特性的不确定性导致双层隔振系统实际为不确定模型。基于快速摄动法推导了参数变异对双层隔振系统的激振、传递率、动反力及机组振动烈度的影响关系式,分析了参数变异的影响规律,并采用蒙特卡洛法进行了验证。研究表明,功率修正误差对倾倒力矩影响最大,回转质量误差对离心惯性力及力矩影响最大;而双层隔振系统动反力受参数变异影响最大,其中两级隔振装置转动惯量及刚度参数占主导因素。

Result from the uncertainty of the machine manufacturing and processing and the physical properties of the material itself,the double-layer vibration isolation system(DVIS)is actually an uncertain model. This article deduced the influence formula of parameters variation on excitation force, transmission rate, dynamic reaction force and vibration intensity of DVIS, and analyzed the influence of parameters variation that it is verified by Monte Carlo method. The results show that the power correction error has the greatest influence on the dumping torque, the rotational mass error has the greatest influence on the centrifugal inertia force and torque;dynamic reaction is most affected by parameters variation on DVIS, Where the moment of inertia and stiffness parameters of the two-stage vibration isolation device are the dominant factors.