title: The use of SESK as a trend parameter for localized bearing fault diagnosis in induction machines.
abstract: A critical work of bearing fault diagnosis is locating the optimum frequency band that contains faulty bearing signal, which is usually buried in the noise background. Now, envelope analysis is commonly used to obtain the bearing defect harmonics from the envelope signal spectrum analysis and has shown fine results in identifying incipient failures occurring in the different parts of a bearing. However, the main step in implementing envelope analysis is to determine a frequency band that contains faulty bearing signal component with the highest signal noise level. Conventionally, the choice of the band is made by manual spectrum comparison via identifying the resonance frequency where the largest change occurred. In this paper, we present a squared envelope based spectral kurtosis method to determine optimum envelope analysis parameters including the filtering band and center frequency through a short time Fourier transform. We have verified the potential of the spectral kurtosis diagnostic strategy in performance improvements for single-defect diagnosis using real laboratory-collected vibration data sets.
authors.affiliation: University of Tunis, ENSIT- Laboratory of Signal Image and Energy Mastery (SIME), LR 13ES03, 1008, Tunisia. Electronic address: lotfi.saidi@esstt.rnu.tn.
authors.forename: Lotfi
authors.initials: L
authors.lastname: Saidi
authors.affiliation: University of Tunis, ENSIT- Laboratory of Signal Image and Energy Mastery (SIME), LR 13ES03, 1008, Tunisia. Electronic address: benalijaouher@yahoo.fr.
authors.forename: Jaouher
authors.initials: J
authors.lastname: Ben Ali
authors.affiliation: University of Brest, FRE CNRS 3744 IRDL, Brest, 29238 Brest, France; Shanghai Maritime University, Shanghai, China. Electronic address: Mohamed.Benbouzid@univ-brest.fr.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Benbouzid
authors.affiliation: Green Power Monitoring Systems, LLC, Vermont 05753, USA. Electronic address: eric@gpms-vt.com.
authors.forename: Eric
authors.initials: E
authors.lastname: Bechhoefer
keywords: Bearing failures; Kurtogram; Spectral kurtosis; Squared envelope analysis; Vibration