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Determination of the Thickness of Elastic Tube Using the Time-Frequency Analysis of Wigner-Ville Détermination de l'Épaisseur d'un Tube élastique à partir de l'Analyse Temps-Fréquence de Wigner-Ville

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The dimensional characterization of an elastic cylindrical shell can be done thanks to its cut-off frequencies of the acoustic circumferential waves propagating around the circumferential of the shell. The Wigner-Ville time-frequency representation, that take into account both the time and frequency parameters of a signal, is used in this study to access to the sought parameters. In this paper, the Wigner-Ville Distribution is applied to acoustic experimental signals backscattered by an aluminium tube with a radii radio (: external radius, : internal radius). The time-frequency images of Wigner-Ville obtained permit to determine the cut-off frequency. From these frequencies we have determined with precision the radii radio and also the aluminium cylindrical shell thickness.

La caractérisation dimensionnelle d'une coque cylindrique élastique peut se faire à partir des fréquences de coupure des ondes circonférentielles acoustiques se propageant autour de la circonférence de la coque. La représentation temps-fréquence de Wigner-Ville, qui prend en compte à la fois le paramètre temps et le paramètre fréquence d'un signal, est utilisée dans cette étude pour accéder aux paramètres recherchés. Dans cet article, la Distribution de Wigner-Ville est appliquée sur des signaux expérimentaux acoustiques rétrodiffusés par un tube d'aluminium de rapport des rayons b/a (a: rayon externe, b: rayon interne). Les images temps-fréquence de Wigner-Ville obtenus permettent de déterminer la fréquence de coupure. A partir de ces fréquences nous avons déterminé, avec précision, le rapport des rayons b/a ainsi que l'épaisseur de la coque cylindrique d'aluminium.
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Language: French

Document Type: Research Article

Publication date: September 1, 2009

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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