NDLI: Determination of the group velocity using the time-varying autoregressive TVAR

Content Provider	IEEE Xplore Digital Library
Author	Latif, R. Aassif, E. Laaboubi, M. Maze, G.
Copyright Year	2007
Description	Author affiliation: Ecole Nat. des Sci. Appl., Univ. Ibn Zohr, Agadir (Latif, R.)
Abstract	A time-varying autoregressive ldquoTVARrdquo approach is used for modeling nonstationary signals, and frequency information is then extracted from the TVAR parameters. In this study, we present the application of the TVAR spectrum on the acoustic signal backscattered by an elastic tube. The parameters of this model are determined by the adaptive algorithm. The adaptive methods may be sufficient for the TVAR parameter estimation, if the nonstationay part of a signal changes slowly. The time-varying spectrum ldquoTVARSrdquo (power spectral density) is applied to the analysis of the dispersion of symmetric S0 and antisymmetric A1 circumferential waves propagating around a tube with a radii ratio equal to 0.95. From the TFAR representation obtained, we have estimated the group velocity with precision. These velocities are compared with those computed by the proper mode theory given in the scientific literature. A good agreement is obtained.
Starting Page	1
Ending Page	4
File Size	241733
Page Count	4
File Format	PDF
ISBN	9781424407781
DOI	10.1109/ISSPA.2007.4555274
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-02-12
Publisher Place	United Arab Emirates
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Time frequency analysis Signal resolution Signal analysis Fourier transforms Uncertainty Autoregressive processes Frequency estimation Interference Filters Data mining
Content Type	Text
Resource Type	Article

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