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Published Article / I07/2004/I-018 ENY-ARTICLE-2008-118

Time-Frequency Representation for Non-Stationary Phenomena in Electrical Engineering

Sikorski, T (Wroclaw University of Technology, Poland) ; Ruczewski, P (Wroclaw University of Technology, Poland) ; Lobos, T (Wroclaw University of Technology, Poland)


Abstract: The paper introduces two-dimensional method of observation and diagnosis of non-stationary signals in electrical engineering. To investigate the methods several experiments were performed using simulated signals. First two-dimensional representations are obtained applying Wigner and Wigner-Ville Distribution . Then local frequency moments are calculated to achieve one-dimensional characteristics. It is shown that such characteristics preserve information about the nonstationarity in point of time, and can be used for calculation of the beginning and duration time of transient states.

Keyword(s): time-frequency analysis ; Wigner-Ville transform ; non-stationary signal ; local frequency moment ; instantaneous frequency
Note: Computational problems of electrical engineering. Proceedings of the VIth international workshop, Zakopane, September 1-4, 2004. pp. 197-200

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Record created 2008-04-06, last modified 2008-04-06

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