动态油膜-转子系统的支座松动故障研究

采用张文等建立的短轴承非稳态非线性油膜力模型,利用数值模拟等方法,分析了带有一端支座松动故障的转子-轴承系统的复杂运动现象,讨论了转速比变化时此类系统中具有周期、拟周期、混沌等多种形式的运动.研究结果表明:当转子-轴承系统出现松动故障时,即便是在较高转速区也会出现周期3分频运动,而且,松动端轴颈的运动轨迹以及支座的相轨迹都呈现出特有的形状,这为有效识别转子-轴承系统的支座松动故障提供了理论参考.

With a nonlinear non-steady oil-film force model newly developed by Zhang Wen et al for short bearings, the complicated motion of rotor-bearing system with pedestal loosened on one side was analyzed using numerical simulation and other methods. The motion in periodical, quasi-periodical and chaotic forms in the system, which take place while the speed ratio changes, was discussed. The results show that a triple-frequency motion is found even though in the higher speed range if a pedestal is loosened in the system. Moreover, peculiar moving path of loosened journal center and phase path of slightly shaking pedestal is found. A theoretic base is thus provided to diagnose effectively the fault of pedestal looseness in a rotor-bearing system.