主动磁轴承控制器对Jeffcott转子裂纹故障特征的影响

Effects of Active Magnetic Bearing Controller on Fault Characteristics of Jeffcott Cracked Rotor

建立主动磁轴承(active magnetic bearing,AMB)系统中裂纹转子的动力学模型,从理论上分析主动磁轴承转子系统中裂纹转子的动力学特性,讨论主动磁轴承的控制方法及控制参数对转子裂纹故障动力特性的影响,以及裂纹对主动磁轴承转子系统的稳定性影响等问题。结果表明,主动磁轴承转子系统中转子的裂纹故障动力特性比传统的裂纹转子的动力特性更为复杂。控制器采用PID控制方式时,传统的用来诊断转子裂纹故障的特征参数在一定条件下能被继续用来检测裂纹的存在;同时,研究结果证明,控制器采用最优控制时,不能采用传统方法检测裂纹。

The dynamic model of a cracked rotor with an active magnetic bearing（AMB） was built,then the dynamic behavior of the cracked rotor with an active magnetic bearing was theoretically analyzed.The effect of the control algorithm and controller parameters of active magnetic bearing on the dynamic behavior of the cracked rotor and the effect of the crack on the stability of the rotor system of active magnetic bearing were discussed.It is shown that the dynamic behaviors of the cracked rotor with active magnetic bearing are obviously complex than that of the traditional cracked rotor system.The fault features of the cracked rotor,which are often used to diagnose the crack,depend on the control method used.When using PID controller,the traditional used features are still useful to diagnose the crack of rotor under certain condition.The result also demonstrates that,when using optimal controller,the traditional used features of the cracked rotor is useless to diagnose the crack in the rotor system.