高速滚动轴承-转子系统动力学特性分析

Analysis of dynamic characteristics for high speed rolling bearing-rotor system

为研究高速滚动轴承-转子系统的非线性动力学特性,分析了高速滚动轴承刚度和阻尼参数的推导方式,得到滚动轴承刚度-阻尼值的变化与轴承滚动体的位置角的关系,及其变化幅与转速的关系;并对轴承-转子系统动力学特性进行了分析,得到阻尼系数的变化对轴承-转子系统动力学特性的影响.通过分析得出转速越大,刚度与阻尼值的变化周期越短,而轴承-转子系统的动力学特性随阻尼增大成非线性减弱.

In order to research the nonlinear dynamics characteristic of the high speed rolling bearing-rotor system, this paper firstly analyzed the derivation of high-speed rolling bearing stiffness and damping parameters, obtained the change of the rolling bearing stiffness-damping value relations with the position of the rolling element bearing angle, and stiffness-damping value amplitude relations with speed. Then a detailed analysis of the influence of roll bearing-damping on the dynamic characteristics of bearing-rotor system was performed, and the influence of damping coefficient for the bearing-rotor system dynamics characteristics were obtained. Through the analysis, this study concluded that the greater change of rotating speed, the shorter the stiffness and damping values cycle amplitude, and bearing-rotor system dynamic characteristics nonlinear is weakened with the increase of damping.