转子系统支承松动的非线性动力学及故障特征

Dynamics and Fault Characteristics of RotorBearing System with Pedestal Looseness

以转子动力学和非线性动力学理论为基础,分析了带有一端轴承支座松动的弹性转子系统的复杂非线性现象·针对非线性转子 轴承系统的具体特点,采用短轴承油膜力模型,应用Runge Kutta数值积分方法,得到系统在某些参数域中的分岔图、时间历程、相图、轨迹图,以及Poincare映射和频谱图,直观地显示了系统的某些运动状态·研究结果表明,松动转子系统在一定条件下松动端轴心轨线图呈'柱状'结构,松动端轴承支座在转速较低时处于微幅运动状态·该研究结果对于更好地了解松动转子系统的故障特征及其诊断提供理论参考·

?The complicated nonlinear phenomena of a elastic rotorbearing system with pedestal looseness at one support was analyzed using the theories of nonlinear dynamics and rotor dynamics. Taking account of the concrete characteristics of the nonlinear rotorbearing system, the oil film force model of short journal bearing was adopted. The bifurcation diagram, time serials diagram, phase map, trajectory figure, Poincare mapping and frequency spectrum diagram of the system under certain parameters were obtained by numerical analysis of RungeKutta method. These diagrams can display the system intuitively. The trajectory diagram on the looseness part is in pole structure,and the looseness pedestal is in small amplitude motion state at low speed. The results may help to diagnose of such type of rotor system.