Envelope Spectrum Analysis with Modified EMD for Fault Diagnosis of Rolling Element Bearing

摘要

Selection of demodulation resonant frequency band for envelope analysis is often made by spectrum examination of all frequency band during the fault diagnosis process in time-frequency analysis. To overcome this limitation, a new criterion to select a suitable resonant frequency band for concern bearing defect frequencies has been examined experimentally in present work. Synchronized resonant frequency band is obtained based on orthogonal reverse biorthogonal wavelet RBIO 5.5 for decomposition of signal, using wavelet packet transform for time-frequency analysis. Concept of pseudo-IMF has not been explained by earlier researchers and the authors are interested to study the effectiveness of subsequent IMF with different resonant frequency band. The experimental results from set up indicate that the present concept is a validated tool, to develop an efficient online fault diagnosis system to diagnose the incipient bearing faults.