磁轴承失灵后坠落转子瞬态振动灾变机理研究

Study on Catastrophic Mechanism for Rotor Drop Transient Vibration Following Magnetic Bearing Failure

研究一个带磁轴承的转子系统,在磁轴承失灵后转子坠入备用轴承引起的非线性瞬态振动· 通过严格建立运动方程和数值仿真计算,详尽地分析了坠落转子转动角速度变化和轴颈与备用轴承接触点法向力变化的时间历程及备用轴承振动位移的频谱。

The nonlinear and transient vibration of a rotor, which dropped onto back_up bearings when its active magnetic bearings were out of order, was investigated. After strictly deriving its equations of motion and performing numerical simulations, the time_histories of rotating speed of the dropping rotor, and normal force at the rubbing contact point as well as the frequency spectrum of the vibration displacement of back_up bearings are fully analyzed. It is found that the strong and unsteady forced bending vibration of the unbalancced and damped rotor decelerating through its first bending vibtation of the unbalaned and damped rotor decelerating through its first critical speed as well as chattering at high frequencies caused by the non_linearity at the rubbing contact point between the journal and back_up bearings may lead to the catastrophic damage of the system.