This paper presents a state space model validation and means of vibration suppression for a rigid rotor supported by hybrid foil-magnetic bearings (HFMBs), using an additional PD controller. The main difficulty related to reducing the vibration of a rigid rotor using an HFMB is the realization of a controller that can minimize resonance without rigid modes. To solve this problem, we developed a state space scheme for system modeling and controller design. First, a rigid rotor supported by air foil bearings is linearized with a magnetic bearing and PD controller, to give a new stable rotor-bearing system. Then, we propose a model validation procedure that uses analytical open-loop imbalance responses to obtain an accurate model of the HFMB rigid-rotor system. After that, a rotor behavior simulation with a PD controller under a range of conditions was designed so as to suppress the rigid mode of the stable rotor-bearing system. A comparison of the measured and simulated results revealed poor controllability and vibration control in the rigid modes. Simulation with step-by-step disturbances, as well as the measured results for the imbalance up to 10,000 rpm, verified the efficacy of the HFMB scheme.
CITATION STYLE
Jeong, S., Choe, B. S., & Lee, Y. B. (2015). Rotordynamic behavior and performance of controllable hybrid foil-magnetic bearing. In Mechanisms and Machine Science (Vol. 21, pp. 1465–1476). Kluwer Academic Publishers. https://doi.org/10.1007/978-3-319-06590-8_120
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