转子-电磁轴承系统动静件碰摩动力特性研究

对转子—磁轴承系统动静件间发生碰摩时的非线性动力学行为进行了研究,在考虑质量偏心的情况下建立了系统的数学模型,求解了系统的周期解,并结合分岔图、庞加莱映射和频谱分析研究了系统的动态特性,研究表明系统发生碰摩后,随着转速及偏心率的增加,转子运动中具有连续的周期分岔现象,并走向失稳,其频谱图中组合频率在奇数倍频附近发生了从右到左的频移现象。这些研究结果可用于控制碰摩后电磁轴承的稳定性,避免大事故的发生。其振动频率特征可判别磁轴承系统是否发生了碰摩故障。 

Dynamic Behavior of a Rotor Magnetic Bearing (RMB) System with the Fault of Rub Between Rotor and Stator

Rub between rotor and stator is a malfunction in rotor bearing system,and this type of fault can also occur in RMB.A mathematic model of RMB considering the eccentricity of the rotor is established,and the vibrations are analyzed by using bifurcation map,Poincare map and spectrum analysis.The numerical simulation shows that a periodic bifurcation appears in the rotor vibration and the RMB system will become unstable with the increase of the speed and eccentricity.In the spectrum,the order frequencies move from the right to the left near the point of odd multiple frequencies.The study results can be used to control the instability of the RMB system with rub between rotor and stator.And the vibration character of rub can be used to diagnose the fault of rub between rotor and stator of a RMB system.