On-site estimation of multiple fault parameters has been performed in a rotor integrated with active-magnetic bearing (AMB) with a cracked shaft supported on flexible conventional bearings. In addition to external viscous damping (at flexible bearings), internal damping (at transverse crack) is considered to show its influence on the dynamics of the cracked system. The instability generated in the rotor system due to the effect of internal damping at high speed are reduced with the control action of the AMB. A Multiple Harmonic Influence Coefficient Method (MHICM) has been proposed that requires the full spectrum amplitude and phases of the rotor responses and excitation forces to obtain the fault parameters of the rotor. The additive crack stiffness, residual unbalances, and internal damping can be estimated in the operating condition with less information on the rotor system. The intensity of the fault parameters is required to be monitored periodically to identify the safe operating speed of the system. As the AMB is an integral part of the rotor system, the multi-harmonic excitation can be initiated without changing the physical condition of the system. To check the robustness of the algorithm, different percentages of random noise are added to the rotor responses.

已在与主动磁轴承 (AMB) 集成的转子中进行了多个故障参数的现场估计，该转子的裂纹轴支撑在柔性传统轴承上。除了外部粘性阻尼（在柔性轴承处）外，内部阻尼（在横向裂纹处）被认为显示了其对裂纹系统动力学的影响。AMB 的控制作用降低了由于高速内部阻尼效应而在转子系统中产生的不稳定性。已经提出了一种多重谐波影响系数方法 (MHICM)，它需要转子响应和激励力的全谱幅度和相位来获得转子的故障参数。附加裂纹刚度、残余不平衡量、内部阻尼可以在运行条件下用较少的转子系统信息进行估计。需要定期监测故障参数的强度，以确定系统的安全运行速度。由于 AMB 是转子系统的一个组成部分，因此可以在不改变系统物理条件的情况下启动多谐波励磁。为了检查算法的稳健性，将不同百分比的随机噪声添加到转子响应中。