Archives of Acoustics, 40, 1, pp. 117–127, 2015
10.1515/aoa-2015-0014

Effect of Liner Characteristics on the Acoustic Performance of Duct Systems

Chokri OTHMANI

Taissir HENTATI

Mohamed TAKTAK
Mechanics, Modelling and Production Laboratory National School of Engineers of Sfax, University of Sfax, Sfax, TUNISIA
Tunisia

Tamer ELNADY

Tahar FAKHFAKH

Mohamed HADDAR

Porous materials are used in many vibro-acoustic applications. Different models describe their performance according to material’s intrinsic characteristics. In this paper, an evaluation of the effect of the porous and geometrical parameters of a liner on the acoustic power attenuation of an axisymmetric lined duct was performed using multimodal scattering matrix. The studied liner is composed by a porous material covered by a perforated plate. Empirical and phenomenal models are used to calculate the acoustic impedance of the studied liner. The later is used as an input to evaluate the duct attenuation. By varying the values of each parameter, its influence is observed, discussed and deduced.
Keywords: porous material, perforated plate, ducts system, scattering matrix, acoustic attenuation.
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DOI: 10.1515/aoa-2015-0014

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