转子-定子系统松动-碰摩耦合故障的动态响应分析

Analysis on Dynamic Responses of Rotor-stator System Wth Coupling Faults of Pedestal Looseness and Rub-impact

建立了考虑定子与基础之间的连接刚度和阻尼(包括定子本身运动)的转子-定子系统发生松动-碰摩时的动力学模型和微分方程,对系统在运行过程中的非线性行为进行了数值仿真分析,发现随着转速的变化过程,此类系统响应主要以拟周期或阵发性分岔进入混沌,而由拟周期或倍周期倒分岔离开混沌。在超临界转速区,系统的响应以混沌和周期k的分频运动为主要运动形式。该结果为转子-定子系统的故障诊断提供了依据和参考。

Considering the rigidity and damping between the stator and foundation, a dynamic model was set up for the rotor-stator system with pedestal looseness and rub-impact faults. The nonlinear dynamic behaviors in running were analyzed by numerical imitated method, which found that the way to chaos motions mostly by quasi-periodicity or explosive bifurcation, and the way to leave chaos motions by quasi-periodicity or period-doubling reverse bifurcations. The chaos and periodicity are the main motion forms in super-critical rotate speed. These provide a theoretic basis reference for the failure diagnosis to the rotor system with pedestal looseness and rub-impact faults.