Time-frequency moments, eyelets, and machine faults

Patrick J. Loughlin

doi:10.1117/12.421222

26 March 2001 Time-frequency moments, eyelets, and machine faults

Patrick J. Loughlin

Proceedings Volume 4391, Wavelet Applications VIII; (2001) https://doi.org/10.1117/12.421222
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

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.

Citation Download Citation

Patrick J. Loughlin "Time-frequency moments, eyelets, and machine faults", Proc. SPIE 4391, Wavelet Applications VIII, (26 March 2001); https://doi.org/10.1117/12.421222

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