转子⁃轴承系统动态特性与轴承磨损演化研究

DYNAMIC CHARACTERISTICS OF ROTOR⁃BEARING SYSTEM AND EVOLUTION OF BEARING WEAR

以角接触球轴承支承的转子⁃轴承系统为研究对象,应用拉格朗日方程,推导建立了转子⁃轴承系统动力学模型,基于Archard模型,建立了包含润滑影响的轴承磨损深度计算模型,磨损深度以轴承游隙的形式引入到系统动力学模型中。分析了转子转速、轴承预紧和转盘位置等参数影响下,转子系统的动态特性与轴承磨损的演化规律。结果表明,轴承磨损对转子动态特性的影响与转子转速和轴承预紧密切相关;转盘位置的改变没有导致转子动态特性随轴承磨损深度的显著变化;转子转速显著影响轴承的磨损,轴承预紧对轴承磨损影响较小,转盘位置变化引起各轴承磨损深度的微弱差异。

Taking the rotor system supported by angular contact ball bearing as the research object,the dynamic model of rotor bearing system is established by using Lagrange equation.Based on the Archard wear model,the calculation model of wear depth of bearing raceways considering lubrication effects is presented.The wear depth is introduced into the system dynamics model as the bearing clearance.The dynamic characteristics of rotor⁃bearing system and the evolution of bearing wear are carefully analyzed taking into account the rotor speed,bearing preload and disc position.The results show that the influence of bearing wear on dynamic characteristics of rotor⁃bearing system is closely related to rotor speed and bearing preload.Changing disc position does not lead to the significant variation of dynamic characteristics of rotor⁃bearing system with wear depth of bearing raceways.The rotor speed significantly affects the bearing wear,the bearing preload has very limited effect on bearing wear,and the variation of the disc position results in the weak difference of wear depth of bearings.