Identification of circumferential acoustic waves propagating around the tube by multiresolution analysis and time-frequency representation

Mostafa Laaboubi , El Houcein Aassif , Rachid Latif , Gerard Maze (1) , Azzedine Dliou (2) , Abdelkader Elhanaoui , Youssef Nahraoui

1 LOMC - Laboratoire Ondes et Milieux Complexes
2 ESSI ENSA

This paper describes a technique based on Multiresolution Analysis (MRA) of the wavelet transform. This technique is applied for decomposition of the original acoustic signal backscattered by a thin tube. The Multiresolution technique was used as a tool to filter the wave modes contained in the original signal. The time-frequency representation using the Smoothed Pseudo-Wigner-Ville (SPWV) distribution is applied on the decomposed acoustic signal. The results obtained show that this technique of the Multiresolution analysis can identify not only single circumferential wave mode but also multimode effectively. This methodology permits to obtain the interesting results.

Mots clés: Acoustic signal; Multiresolution Analysis; Time-frequency representations; Circumferential waves

Domaines: Acoustique [physics.class-ph]

Mostafa Laaboubi, El Houcein Aassif, Rachid Latif, Gerard Maze, Azzedine Dliou, et al.. Identification of circumferential acoustic waves propagating around the tube by multiresolution analysis and time-frequency representation. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811252⟩