Response characteristics of a rotor-bearing system with double-frequency time-varying bearing stiffness

被引：0
|
作者：
Zhang X. [1 ]
Han Q. [2 ]
Chu F. [2 ]
机构：
[1] Aero Engine Academy of China, Beijing
[2] Department of Mechanical Engineering, Tsinghua University, Beijing
来源：
Chu, Fulei | 2017年 / Chinese Vibration Engineering Society卷 / 36期
关键词：
Angular contact ball bearing; Double-frequency time-varying bearing stiffness; Response characteristics; Rotor-bearing system;
D O I：
10.13465/j.cnki.jvs.2017.13.018
中图分类号：
学科分类号：
摘要：
Considering periodic time-varying stiffness of ball-bearings due to finite balls and a rotor's unbalanced force, a 3-DOF rotor-bearing system was set up. Referring to the response frequency distribution law of a single-frequency parametrically excited system, the response frequency constitution law of a double-frequency parametrically excited system was formed. The latter was that the frequencies appearing in the system's free responses are combinations of the sytem's equivalent natural frequencies and the two parametric ones, respectively and combinations of the system's equivalent natural frequencies and the two parametric ones simultaneously; the frequencies appearing in the system's forced responses include not only those appearing in the system's free responses, but also combinations of the excitation frequencies and the two parametric ones, respectively and combinations of the excitation frequencies and the two parametric ones simultaneously. In addition, the double-frequency response and response frequency components corresponding to parametric frequencies and their double ones appearing in the responses of the rotor-bearing system were explained reasonably through deep analyses here. The conclusions obtained here were helpful to deeply understanding response characteristics in frequency-domain of a muti-frequency parametrically excited system, they also provided a reference for frequency component identification of faults appearing in a rotating machinery system with time-varying parameters. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：116 / 121
页数：5
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