Nonlinear dynamics of a rotor-ball bearing system with misalignment-rubbing coupled faults
ZHEN Man1,2, SUN Tao1, TIAN Yongsheng1, ZHANG Hualiang1,2, TAN Chunqing1,2
1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：In order to obtain the dynamic characteristics of rotor system under misalignment-rubbing coupling fault, the nonlinear dynamic differential equation of rolling bearing rotor system under holonomic constraints was established by Lagrangian undetermined multiplier method. The dynamic response of the system under misalignment-rubbing coupling fault was studied by Runge-Kutta numerical method. Time domain diagram, axis orbit diagram, bifurcation diagram, Poincare section diagram and FFT spectrum were used to analyze the effects of misalignment, rubbing stiffness and clearance on the vibration response of the rotor. The analysis results show that the misalignment increase will increase the vibration response of the system with 1-octave,and produce even-octave such as 2-fold and 4-fold, and the combined frequency response with VC (varying compliance) frequency at the same time. At low speed, the rubbing stiffness and clearance have little influence on the rotor system; at high speed,smaller rubbing stiffness and larger rubbing clearance would alleviate the nonlinear behavior of the system.
甄满1,2，孙涛1，田拥胜1，张华良1,2，谭春青1,2. 滚动轴承转子系统不对中-碰摩耦合故障非线性动力学分析[J]. 振动与冲击, 2020, 39(7): 140-147.
ZHEN Man1,2, SUN Tao1, TIAN Yongsheng1, ZHANG Hualiang1,2, TAN Chunqing1,2. Nonlinear dynamics of a rotor-ball bearing system with misalignment-rubbing coupled faults. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(7): 140-147.
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CHEN Guo. Nonlinear dynamic response analysis of rotor-ball bearing system including unbalance-rubbing-looseness
