NDLI: Removing harmonic signal nonstationarity by dynamic resampling

Content Provider	IEEE Xplore Digital Library
Author	Sokolov, R.T. Rogers, J.C.
Copyright Year	1990
Description	Author affiliation: Coll. of Eng., Hartford Univ., West Hartford, CT, USA (Sokolov, R.T.)
Abstract	Signals produced by rotating machinery often display short term nonstationarity caused by small speed fluctuations. In some cases it is possible to control the data acquisition system sample rate so that Fourier spectral analysis of the signal is not affected by the small variations in signal harmonic frequencies. This is often referred to as order tracking data acquisition. However, electric ground vehicle sounds recorded remotely do not permit use of a local speed reference to control sample rate. This paper demonstrates that dynamic resampling of multi-harmonic acoustic signals in the presence of noise is feasible. A phase tracking algorithm is used to track a principal spectral component and to provide the necessary resampling information. Both synthetic and actual vehicle sounds are processed and improved Fourier power spectral estimates are obtained by simple averaging. If significant noise is present, the signal to noise ratio can be greatly improved by combining individual cycles of the reexampled waveform to approximate coherent detection (an audio demonstration of the improved signal to noise ratio is quite compelling). Also, it is shown that known interharmonic relative amplitude and phase information contained in the original nonstationary signal can be recovered by: tracking; dynamic resampling; coherent averaging; and performing a Fourier series decomposition. Finally, a wavelet approach to improve automatic fundamental frequency component recognition is discussed.
Starting Page	303
Ending Page	308
File Size	617802
Page Count	6
File Format	PDF
ISBN	0780373693
DOI	10.1109/ISIE.1995.497013
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-07-10
Publisher Place	Greece
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Vehicle dynamics Signal to noise ratio Data acquisition Frequency Acoustic noise Machinery Displays Fluctuations Control systems Spectral analysis
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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