Feature Analysis of Oil-Film Instability Fault Based on Time-Frequency Methods in Rotor Systems

Aiming at oil-film instability fault often occurring in the project, fault simulation experiment was simulated by using a rotor test rig, and vibration signals of two groups were collected by adjusting thickness of disc and shaft length. Fault features were extracted by using spectrum cascades, reassigned wavelet scalograms and rotor trajectories. Some new interesting features are obtained by feature analysis and fault mechanism corresponding to theses features is explained. The results will provide theoretical references for diagnosing this kind of fault.