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Propagation acoustique en conduit traité: influence de l'écoulement sur la propagation acoustique avec impédance de paroi.

Abstract : This experimental study performed at the Laboratoire d'Acoustique de l'Université du Maine is concerned with acoustical wave propagation in lined ducts with superimposed stationnary flow. The present waveguides are straight ducts, whose wall may be locally modified. The lined part is globally determined with its impedance. Determine the impedance allows an estimation of the sound attenuation in the lined duct, and thereby industrial applications, such as reduction of noise in exhaust pipes or jet engines.
The experiments are performed on locally reacting liners, whose impedances are estimated on the frequency range.

A method based on multimodal formulation of the sound propagation is proposed and validated for the studied liners. The modeling gives the transmission characteristics of an acoustic wave. The applications are done whether for a plane wave propagation, or with more modes taken into account, and at last, in cases considering a non uniform flow profile.
This method is linked to an inverse method, in order to determine the impedance of the lined part of the duct.

The results of the computation are compared to the measurements. The experiments have been performed on flow ducts, and the scattering coefficients are measured by the mean of a usual multimicrophonic method.
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https://tel.archives-ouvertes.fr/tel-00106271
Contributor : Maud Leroux <>
Submitted on : Friday, October 13, 2006 - 3:19:28 PM
Last modification on : Tuesday, March 31, 2020 - 3:20:48 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 6:01:12 PM

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  • HAL Id : tel-00106271, version 1

Citation

Maud Leroux. Propagation acoustique en conduit traité: influence de l'écoulement sur la propagation acoustique avec impédance de paroi.. Acoustique [physics.class-ph]. Université du Maine, 2006. Français. ⟨tel-00106271⟩

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