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The instantaneous frequency rate spectogram

Abstrakt

An accelerogram of the instantaneous phase of signal components referred to as an instantaneous frequency rate spectrogram (IFRS) is presented as a joint time-frequency distribution. The distribution is directly obtained by processing the short-time Fourier transform (STFT) locally. A novel approach to amplitude demodulation based upon the reassignment method is introduced as a useful by-product. Additionally, an estimator of energy density versus the instantaneous frequency rate (IFR) is proposed and referred to as the IFR profile. The energy density is estimated based upon both the classical energy spectrogram and the IFRS smoothened by the median filter. Moreover, the impact of an analyzing window width, additive white Gaussian noise and observation time is tested. Finally, the introduced method is used for the analysis of the acoustic emission of an automotive engine. The recording of the engine of a Lamborghini Gallardo is analyzed as an example.

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
MECHANICAL SYSTEMS AND SIGNAL PROCESSING nr 66-67, strony 361 - 373,
ISSN: 0888-3270
Język:
angielski
Rok wydania:
2016
Opis bibliograficzny:
Czarnecki K.: The instantaneous frequency rate spectogram// MECHANICAL SYSTEMS AND SIGNAL PROCESSING. -Vol. 66-67, (2016), s.361-373
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.ymssp.2015.06.029
Weryfikacja:
Politechnika Gdańska

wyświetlono 43 razy

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