中文摘要：

从理论上分析了带主动电磁阻尼器的裂纹转子系统的动力特性,讨论了裂纹对带主动电磁阻尼器的转子系统稳定性及不平衡响应特性的影响。结果表明,带主动电磁阻尼器的裂纹转子系统的动力特性比无控制系统的传统裂纹转子系统的特性更为复杂。如果在主动电磁阻尼器控制系统的设计时没有考虑到裂纹的影响,那么在一定的条件下裂纹会导致带主动电磁阻尼器的转子系统失去稳定性。在转子系统中采用对转子振动高效的控制策略可能隐藏了转子系统中存在裂纹的特征,不利于裂纹的诊断。当转子系统的振动被主动电磁阻尼器完全控制时,在带主动电磁阻尼器的转子系统中只能够利用亚临界转速区响应中的2倍和3倍超谐波成份来作为诊断裂纹的指标。

英文摘要：

The dynamic characteristics of a cracked rotor with an active magnetic damper（AMD） were theoretically analyzed in this paper.The effects of using optimal controller parameters on the dynamic characteristics of the cracked rotor and the effect of a crack on the stability of the active control system were discussed.It is shown that the dynamic characteristics of the cracked rotor with the AMD are more complex than that of the traditional cracked rotor system.If the effect of the crack on the control system is not taken into account at the design stage of the controller,the control system will lose its stability in some cases when cracks appear.Automatic control strategies which can effectively suppress the rotor vibration may hide the fault characteristics of the cracked rotor,rather than helping to diagnose a crack.It is very difficult to detect a crack in the rotor with the AMD when the vibration of the rotor system is fully controlled.Monitoring the super-harmonic components of 2×and 3×revolution in the sub-critical speed region can be used as an index to detect a crack in the rotor with an AMD system,but it is impossible to detect a crack in the rotor with an AMD system by monitoring the super-harmonic components of 2×and 3×revolution in the super-critical speed region.