Abstract
To minimize leakage and maintain the efficiency of turbomachinery, brush seal can be installed with zero clearance or interference as the flexibility. This leads to contact between the rotor and bristle pack, and may cause self-excited vibration, even instability. In this study, to establishment a mathematical model of the rotor system, a seal force model with bristle interference is proposed and the nonlinear oil-film force is applied in view of short bearing assumption. The influences of main factors containing rotor rotational speed, installing interval, disc mass, and disk eccentricity on the nonlinear characteristics of the rotor-bearing-brush seal system are conducted by adopting bifurcation diagram, spectrum cascade, axis orbit, and Poincaré map. The results indicate that the vibration amplitude of the system with bristle interference is a bit larger than that without interference. The system stability is enhanced with smaller disk mass at a higher rotational speed. The proposed model could provide valuable reference for the design of a rotor-bearing-seal system.
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This research is financially supported by National Natural Science Foundation of China (Grant Nos. 11802168 and 51575331).
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Recommended by Associate Editor Junhong Park
Yuan Wei received his Ph.D. from Harbin Institute of Technology, China, in 2017, and joined the School of Mechatronics Engineering and Automation, Shanghai University, Shanghai, China, in 2018. His research interests include rotor dynamics, nonlinear dynamics, vibration and control.
Shulin Liu received his Ph.D. from Harbin Institute of Technology, China, in 2003. He is a Professor of Mechatronic Engineering and Automation, Shanghai University, Shanghai, China. His research interests include nonlinear dynamics, fault diagnosis, vibration and control.
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Wei, Y., Liu, S. Numerical analysis of the dynamic behavior of a rotor-bearing-brush seal system with bristle interference. J Mech Sci Technol 33, 3895–3903 (2019). https://doi.org/10.1007/s12206-019-0733-z
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DOI: https://doi.org/10.1007/s12206-019-0733-z