Wavelet Analysis And Envelope Detection For Rolling Element Bearing Fault Diagnosis - A Comparative Study

摘要

Envelope Detection (ED) is traditionally always used with Fast Fourier Transform (FFT) to identify the rolling element bearing faults. The inability of FFT to detect non-stationary signals makes Wavelet Analysis (WA) an alternative for machinery fault diagnosis as WA can detect both stationary and non-stationery signals. A comparative study of ED with FFT and WA techniques for bearing fault diagnosis is presented in this report and it is shown with help of experimental results that the WA is a better fault diagnostic tool.