混合轴承柔性转子系统稳定性研究

Research on the Stability of the System of Hybrid Journal Bearings

用数值解方法分析了多腔混合轴承的动态特性。对于典型的毛细管节流 4腔轴承计算了在各种设计参数下的线性化的刚度系数和阻尼系数 ,从而得到了轴承相应的刚度和稳定性速度阈值 ,指出了动压效应对这两者的负面影响。讨论了转子柔性对自激涡动的作用 ,提出了在设计转子混合轴承系统中实用的确定稳定性阈值的方法。

An analysis and a numerical solution to predict the dynamic performance of multirecess hybrid-operating oil journal bearings are presented. The linearized stiffness and damping coefficients of a typical capillary-compensated bearing with four recesses are computed for various design parameters.The corresponding stiffness and the stability threshold of the bearings are then obtained, and the opposite influences of the hydrodynamic action on them are demonstrated. The effect of rotor flexibility on self-excited whirl is discussed, and a method is given to determine the stability threshold of a rotor-hybrid bearing'system.