不同工况下高速角接触球轴承-刚性转子系统动力学耦合特性分析

Analysis of dynamic coupling characteristics of high speed angular contact ball bearing-rigid rotor system under different working conditions

根据建立的高速角接触球轴承-刚性转子系统动力学数值仿真模型,以某仪表轴承支承的转子系统为算例,分析了考虑转子振动与否对系统动力学性能的影响,并详细探究了轴向载荷以及转速对转子振动、轴承内部载荷分布及旋滚比、保持架的受力和质心运动以及磨损情况的影响。结果表明:考虑转子振动时,在纯轴向载荷下,轴承各位置处的球载荷也会存在差异,且保持架质心运动包含内圈频率,运动稳定性变差;随着轴向载荷的增大,转子振动逐渐减弱,轴承打滑减小,但由于轴承球载荷的增大,内、外圈滚道磨损呈现先减小后增大的趋势,并在轴向载荷为4 N时磨损最小;保持架稳定性和磨损则均随着轴向载荷的增大而增大;随着转速的增大,转子振动加强,内、外圈沟道及保持架磨损均加剧,保持架稳定性先增强后减弱,且在转速达到40000 r/min后,轴承磨损和保持架稳定性急剧恶化。

According to the established complete dynamic numerical simulation model of high-speed angular contact ball bearing-rigid rotor system,the effect of rotor vibration on the dynamic performance of the system was analyzed, and the effects of axial load and rotating speed on rotor vibration,load distribution and spin-roll ratio in bearing,cage mass center motion wear were also discussed. The results showed that:when the rotor vibration was considered,the ball load at each position of the bearing differed even under the pure axial load,and for the cage mass center motion including the inner ring frequency, its stability became poor. With the increase of axial load,the rotor vibration and bearing slip decreased. However,with the increase of bearing ball load,the wear of inner and outer raceways first decreased and then increased,and the wear was the minimum when the axial load was 4 N. Both the cage stability and wear increased with the increase of axial load. With the increase of the rotating speed, the vibration of the rotor and bearing wear increased, while the stability of the cage first increased and then decreased. Once the rotating speed reached 40 000 r/min, the bearing wear and the cage stability deteriorated sharply.