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Proceedings Paper

Time-frequency moments, eyelets, and machine faults
Author(s): Patrick J. Loughlin
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Paper Abstract

It has been shown that often the onset of developing faults in machines is clearly manifest in the time-frequency plane before any problems are noted by conventional methods such as the power spectrum. In this paper we explore a particular feature of some faulting machines, wherein a single vibration frequency briefly and intermittently appears as 'eyelets' in the time-frequency plane. We show that abrupt phase shifts in a tone, or equivalently sudden, rapid changes in the amplitude, cause a transient increase in the instantaneous spectral moments, particularly the instantaneous bandwidth and the instantaneous kurtosis, and cause eyelets in time-frequency similar to those seen in real machine vibrations.

Paper Details

Date Published: 26 March 2001
PDF: 7 pages
Proc. SPIE 4391, Wavelet Applications VIII, (26 March 2001); doi: 10.1117/12.421222
Show Author Affiliations
Patrick J. Loughlin, Univ. of Pittsburgh (United States)

Published in SPIE Proceedings Vol. 4391:
Wavelet Applications VIII
Harold H. Szu; David L. Donoho; Adolf W. Lohmann; William J. Campbell; James R. Buss, Editor(s)

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