关键词: 支座, 转子, 松动故障, 频率特性, 数值仿真

Abstract:

A mathematical model with nonlinear oil film force was employed to study the pedestal looseness fault at two supports in a rotor-bearing system. By using Runge-Kutta numerical method, the motion equations were solved, and frequency characteristics of the rotor system was obtained after applying Fast Fourier Transformation(FFT) on these stable solutions. The simulation results show that when the vibration displacement is smaller than the maximum inner-space value, there are many low frequencies; when the vibration displacement is larger than the maximum inner-space value, there exist some apparent high frequencies. The simulation results will be helpful to diagnose the fault of pedestal looseness in this system.

Key words: pedestal, rotor, looseness, frequency characteristic, numerical simulation