Effect of Liner Characteristics on the Acoustic Performance of Duct Systems

Porous materials are used in many vibro-acoustic applications. Different models describe their perfor- mance 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...

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Bibliographic Details
Published in:Archives of acoustics 2015-01, Vol.40 (1), p.117-127
Main Authors: Othmani, Chokri, Hentati, Taissir, Taktak, Mohamed, Elnady, Tamer, Haddar, Mohamed
Format: Article
Language:English
Subjects:
Acoustic impedance
Acoustics
Attenuation
Ducts
Liners
Mathematical models
Perforated plates
Porous materials
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Summary:Porous materials are used in many vibro-acoustic applications. Different models describe their perfor- mance 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 ma- terial 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
ISSN:0137-5075
2300-262X
DOI:10.1515/aoa-2015-0014