Abstract
Bearing defect diagnosis is traditionally done using the demodulation/enveloping technology. Diagnosis is mostly based on the spectrum of the squared envelope signal. In literature, the use of the higher order spectra (HOS) has shown to have a tremendous potential for vibration based diagnostics. In this paper we implemented and experimentally validated the higher order spectra based on the envelope analysis for the diagnosis of ball bearing defects. The implemented technology employs the spectral kurtosis to obtain a frequency band for the demodulation and the third order normalized spectra, i.e. the bicoherence for diagnosis of bearing fault. The high effectiveness of the diagnostics of the implemented technology has been experimentally revealed and compared with that of well-known demodulation/enveloping technology.
Highlights
Diagnostics and prognostics of the rolling element bearing has been widely researched, e.g. works of McFadden and Smith (1984), Tandon and Choudhury (1999), Randall and Antoni (2011), Wang, Youn, and Hu (2012), Camci, Medjaher, Zerhouni, and Nectoux (2012), Hu, Youn, and Wang (2012), and Medjaher, Camci, and Zerhouni (2012)
The misalignment radial load was induced though using premachined shims at the non-drive end (NDE)
A window length of 1/10 times the duration between impacts, which corresponds to a frequency resolution of 10 times the bearing characteristic defect frequency, found the most suitable for the spectral kurtosis calculation
Summary
Diagnostics and prognostics of the rolling element bearing has been widely researched, e.g. works of McFadden and Smith (1984), Tandon and Choudhury (1999), Randall and Antoni (2011), Wang, Youn, and Hu (2012), Camci, Medjaher, Zerhouni, and Nectoux (2012), Hu, Youn, and Wang (2012), and Medjaher, Camci, and Zerhouni (2012). The demodulation/enveloping based methods have a long history of successful application for the bearing damage diagnosis (McFadden & Smith, 1984; Tandon & Choudhury, 1999; Randall & Antoni, 2011). Every time defect passes through a rolling element an impact occurs and an impulse response is generated This short duration impact causes resonance of associated rolling element or even of the machine, which manifests through modulation by bearing characteristic defect frequency.The main purpose. The one of the approach was to find resonance from its broadband present in high frequency region of the spectrum (McFadden & Smith, 1984), this need historical data of healthy bearing for comparison purpose (Sawalhi & Randall, 2004).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
