Vibration Control of a Nonlinear Rotor System through Electro-Magnetic Bearings

Abstract:

In rotating machinery, vibration resonance with large amplitude and complex pattern occurs at critical speeds due to rotor imbalance and nonlinear effects. In this paper, a vibration control method is proposed for a rotor system supported by a ball bearing and an electro-magnetic bearing. In particular, a disturbance observer combined with the current delay estimation is implemented to improve the controller's ability of compensating for system's nonlinear effects and uncertainty. As a result, the rotor vibration is suppressed to very small amplitudes in the entire operating speed range. The proposed method is validated through numerical simulations and experiments.

• Periodical: Advanced Materials Research (Volumes 452-453)
• Pages: 1408-1414
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.452-453.1408
• Online since: January 2012
• Authors: Jun Liu, Qiao Sun
• Keywords: Disturbance Observer, Electro-Magnetic Bearing, Nonlinearity, Rotor Dynamics, Vibration Control, Vibration Resonance

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