Abstract：In the magnetic machinery, the contact between the impeller and the rotor assembly interface introduces additional contact stiffness, which weakens the modal damping of the rotor system, reduces the performance and stability of the magnetic levitation bearing rotor system, and excites the high frequency modal vibration of the rotor. At present, there are relatively few studies on the high-frequency modal vibration of the rotor caused by the contact interface in the magnetic suspension bearing system, and the traditional PID controller cannot effectively suppress such vibration. To solve the above problems, an H∞ robust controller based on flexible rotor is designed. First, the dynamic analysis of the magnetic suspension bearing rotor system considering the interface contact is carried out to explore its modal vibration characteristics. Afterwards, the frequency response curve of the magnetic suspension bearing rotor system was obtained by sweeping experiments. Based on the modeling of the traditional magnetic suspension bearing rigid rotor system, the rotor transfer function model was reconstructed based on the flexible rotor modal theory, and the rotor transfer function model was reconstructed based on this model. The system sweep frequency curve is fitted to obtain the high-order modal parameters of the rotor system. Finally, the controlled object model considering the high-order modal characteristics is established, and the H∞ robust controller is designed. The experimental results show that the robust controller based on the flexible rotor model can effectively suppress the high-frequency modal vibration of the rotor caused by the contact interface.
王艺宇，周瑾，周扬，徐园平，张一博. 考虑界面接触的磁悬浮转子高阶模态自激振动抑制研究[J]. 振动与冲击, 2023, 42(23): 29-40.
WANG Yiyu,ZHOU Jin,ZHOU Yang,XU Yuanping,ZHANG Yibo. Suppression of high order modal self-excited vibration of magnetic levitation rotor considering interface contact. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(23): 29-40.
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