Abstract：According to the vibration fault characteristics of rolling elements bearing, a fault diagnosis method based on empirical mode decomposition ( EMD) and homomorphic filtering demodulation was introduced. The vibration signal of a rolling element bearing was decomposed into several intrinsic mode functions ( IMFs) with EMD method, and every IMF highlights some local features of the original signal. Then, the characteristic frequency of bearing inner ring was extracted from some IMFs by using homomorphic filtering demodulation, and inner race severe wear was diagnosed. At the same time, in order to give prominence to the superiority of the homomorphic filtering demodulation method, a comparison with the Hilbert envelope method was completed.The simulative and experimental results indicate that the effect of homomorphic filtering demodulation is superior to Hilbert envelope demodulation.

Keyword：fault diagnosis;empirical mode decomposition;hilbert envelope;homomorphic filtering demodulation;