| Citation: | LIU Di, LI Chao, MA Yanhong, et al. Dynamic characteristics of smooth time-varying constrained rotor[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(11): 2331-2343. doi: 10.13700/j.bh.1001-5965.2020.0384(in Chinese)
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The smooth time-varying constraint is a mechanical effect of continuous contact produced by the rubbing between rotor and stator, in which the periodic time-varying constraint is applied to the rotor. The additional stiffness curve caused by contact between the stator and the rotor is a smooth and derivable function with time. A smooth time-varying constraint model is established based on the orbit of rotor in experiment, and the modal frequency, stability and response of rotor system with smooth time-varying constraint are analyzed based on the Hill method, which provides an analysis frame for the fault identification and stability analysis of the rubbing rotor. The research results show that the rotor with smooth time-varying constraint has the characteristics of frequency coupling, multi-frequency and instability. In the unstable speed region, the amplitude of the rotor gradually increases with time. The frequency component that causes the instability of the rotor system is the frequency component whose real part of eigenvalue is greater than 0 in the rotor modal analysis. In the stable speed region, the rotor's frequency response is mainly the frequency combination composed of speed frequency and contact frequency.
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