The dynamics of a cracked rotor with an active magnetic bearing |
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Authors: | Changsheng Zhu DA Robb DJ Ewins |
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Institution: | a Department of Electrical Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, People's Republic of Chinab Department of Mechanical Engineering, Imperial College London, Centre of Vibration Engineering, London SW7 2BX, UK |
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Abstract: | The dynamic characteristics of a cracked rotor with an active magnetic bearing (AMB) are 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 are discussed. It is shown that the dynamic characteristics of the cracked rotor with AMBs are clearly more complex than that of the traditional cracked rotor system. Adaptive control with AMBs may hide the fault characteristics of the cracked rotor, rather than helping to diagnose a crack; this will depend on the controller strategy used. It is very difficult to detect a crack in the rotor with an AMB support system 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 AMB system. If the effect of the crack is not taken into account at the design stage of the controller, then the rotor-AMB system will lose its stability in some cases when cracks appear. |
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