Abstract
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
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