Sync-Period Frequency Analysis and Its Application to the Diagnosis of MultipleElement Defects of Rolling Bearings

摘要

A method for diagnosing multiple element defects of rolling bearings has beeninvestigated. The method combines the time synchronous averaging and envelope spectral analysis techniques to produce spectra of synchronously averaged envelope signals with a range of synchronous frequencies. The spectra are displayed in the domains of synchronous period versus frequency to result in the sync-period frequency distribution. The distribution separates the characteristic defect frequencies and their associated sidebands in the synchronous period axis. This analysis technique makes it possible to detect and diagnose multiple defects appearing on different elements of rolling bearings. Another main benefit of the method is the significant noise reduction by both enveloping and synchronous averaging process. Analysis results from computer simulated data and experimental simulated data are presented.