Abstract
The resonance vibration control of flexible rotor supported on active magnetic bearings (AMB) is a challenging issue in the industrial applications. This work addresses the application of robust control method to the resonance vibration control for AMB flexible rotor while passing through the critical speed. This model-based method shows great superiority to handling flexible mode vibration, which can guarantee robust stability and performance when encountering modal perturbation. First, the designed flexible rotor-AMB test rig is briefly introduced. Then the system modeling is described in detail including flexible rotor, power amplifier, displacement sensors and magnetic actuator and rotordynamics are analyzed. Model validation is carried out by sine sweeping test. Finally, theμ-synthesis controller is designed. The simulation and experimental results indicate that the designedμ-synthesis controller, which shows great robustness to modal perturbation, can effectively suppress the resonance vibration of flexible rotor and achieve supercritical operation.
Highlights
Active magnetic bearing (AMB) is a typically mechatronical bearing which can make the rotor suspend stably through active feedback control
The resonance vibration control for AMB flexible rotor based on μ-synthesis controller is investigated
A flexible rotor test rig is designed and the system model is obtained through the combination of system identification and theoretical modeling method
Summary
Active magnetic bearing (AMB) is a typically mechatronical bearing which can make the rotor suspend stably through active feedback control. Researchers resort to PID controller integrated with different general second order filters to achieve good resonance vibration control effect for AMB flexible rotor [12,13,14]. In these literatures, the optimal damping and optimal phase angle are derived in detail based on the plant phase information nearby the rotor bending mode, phase lead filter and notch filter are connected in series after the PID controller based on the optimal phase angle. A transparent procedure of control oriented rotor-AMB system modeling and μ-synthesis controller design is presented Both the simulation and experimental results demonstrate that the designed controller has better rotor resonance vibration suppression performance and high robustness to system uncertainty to make the flexible rotor exceed the first bending critical speed smoothly
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