轴承副接触对立式转子系统动力学行为的影响研究

Research on the Influence of Bearing Pair Contact on the Dynamic Behavior of Vertical Rotor Systems

考虑轴尖-宝石轴承副的接触力,建立立式转子系统非线性动力学模型,分析轴承副接触参数对转子系统固有特性的影响,讨论横向连接刚度、滑动摩擦系数对转子系统动力学行为的影响。结果表明,引入轴承力模型将导致在轴尖模态频率附近出现共振峰值,轴承副接触区变化将触发低频进动;随着连接刚度增大,轴尖磨损状态将发生从圆环接触逐渐向偏磨接触最终向大范围圆环接触的转变;当处于边界润滑时,滑动摩擦系数不会对转子系统产生影响,处于干摩擦状态时,滑动摩擦系数增加将加速系统产生偏磨;研究结果对立式转子系统动力学优化设计具有重要意义。

Considering the contact force of jewel-pivot bearing pair,the nonlinear dynamic model of the vertical rotor system is established,and the influence of the contact parameters of the bearing pair on the inherent characteristics of the rotor system is analyzed.The effects of lateral connection stiffness and sliding friction coefficient on the dynamic behavior of the rotor system are discussed.The results show that the introduction of the bearing force model will lead to a resonance peak near the modal frequency of the pivot,and the change of the contact area of the bearing pair will trigger low-frequency procession.With the increase of the connection stiffness,the wear state of the pivot will gradually change from ring contact to eccentric wear contact and finally to large-scale ring contact.In the case of boundary lubrication,the sliding friction coefficient will not affect the rotor system;while in dry friction state,the increase of sliding friction coefficient will accelerate the eccentric wear of the system.The research results are of great significance to the dynamic optimization design of vertical rotor systems.