期刊
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
卷 41, 期 2, 页码 451-478出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/14613484211052714
关键词
Asymmetric rotor; rational function model; dynamic response; bifurcation
类别
资金
- National Natural Science Foundation of China [52075438]
- Key Research and Development Program of Shaanxi Province of China [2020GY-106]
- Open Project of State Key Laboratory for Manufacturing Systems Engineering [sklms2020010]
This study investigates the dynamic characteristics of an asymmetric rotor system supported in axial-grooved gas-lubricated bearings. A hybrid numerical model is established for effectively solving the nonlinear dynamic responses of the rotor system. The study reveals complex nonlinear dynamic phenomena and specific bifurcation characteristics in the asymmetric rotor system.
Dynamic characteristics of the asymmetric rotor system supported in axial-grooved gas-lubricated bearings are studied. In order to solve nonlinear dynamic response of rotor system effectively, a hybrid numerical model is established by coupling the motion equation of rotor with the rational function model of the gas film forces. The rational function model of the gas film forces of gas-lubricated bearing is established based on vector fitting theory. By using the hybrid numerical model, the repeated calculations of the unsteady Reynolds equation and gas film forces are avoided; the continuous rotor trajectory and the dynamic gas film forces can be calculated simultaneously; and for the rotor system supported in the same bearings, the computing cost can be saved effectively. The nonlinear dynamic responses of asymmetric rotor system supported in axial-grooved gas-lubricated bearings are investigated by trajectory diagrams, frequency spectrum, Poincare maps, and time series. The bifurcations are analyzed by the bifurcation diagrams with different rotating speeds and mass eccentricities. The dynamic behaviors of the asymmetric rotor system appear complex nonlinear dynamic phenomenon and specific bifurcation characteristics.
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