Abstract: This paper introduces two-dimensional methods of observation and diagnosis of non-stationary signals in electrical engineering as well as its further application in instantaneous frequency calculation. The investigations are carried out on two levels: firstly, two-dimensional representations are obtained applying Wigner Distribution, then local frequency moments are calculated to achieve one-dimensional characteristics of instantaneous frequency. It is shown that such characteristic preserves information about the nonstationarity in time domain and can be used for detection and duration of transient states.

Keyword(s): EEEIC ; Wigner distribution ; frequency
Note: Proceedings of the 7th Int. Conference EEEIC 2008, Cottbus, 5-11.05.2008, pp. 35-36


Fulltext : http://zet10.ipee.pwr.wroc.pl/record/171/files/

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