Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division July 2, 2002 revised manuscript received March 25, 2003. Associate Editor: L. Chang.

Among the techniques used for rolling element bearing defect diagnosis, vibration monitoring via envelope analysis is widely used and perhaps the most popular approach for detecting bearing incipient failures. Acoustic emission techniques also show some promising results in detecting bearing defects before they appear on the material surface 1. Envelope analysis provides a mechanism for extracting the amplitude modulation of the structural resonance, which could be excited by the impact due to the contact of bearing defect with other components in the bearing 2. However, this technique suffers from the difficulty of determining the best frequency band for enveloping due to the dynamic nature of the signal pattern. The impulsive...

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