Detection of Generalized-Roughness Bearing Fault by Spectral-Kurtosis Energy of Vibration or Current Signals
Immovilli, F.; Cocconcelli, M.; Bellini, A.; Rubini, R.
Industrial Electronics, IEEE Transactions on
Volume 56, Issue 11, Nov. 2009 Page(s):4710 - 4717
Digital Object Identifier   10.1109/TIE.2009.2025288
Summary:Generalized roughness is the most common damage occurring to rolling bearings. It produces a frequency spreading of the characteristic fault frequencies, thus making it difficult to detect with spectral or envelope analysis. A statistical analysis of typical bearing faults is proposed here in order to identify the spreading bandwidth related to specific conditions, relying on current or vibration measurements only. Then, a diagnostic index based on the computation of the energy in the previously defined bandwidth is used to diagnose bearing faults. The proposed method was validated experimentally with vibration signals, with robust and reliable results. The same procedure can be extended to current signals.

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