On the simultaneous inversion of micro-perforated panels' parameters: Application to single and double air-cavity backed systems

Rostand B Tayong; Jacques A Manyo Manyo; Emmanuel Siryabe; Guy E Ntamack

doi:10.1121/1.5032312

On the simultaneous inversion of micro-perforated panels' parameters: Application to single and double air-cavity backed systems

J Acoust Soc Am. 2018 Apr;143(4):2279. doi: 10.1121/1.5032312.

Authors

Rostand B Tayong¹, Jacques A Manyo Manyo², Emmanuel Siryabe³, Guy E Ntamack²

Affiliations

¹ Department of Mechanical Engineering, University of Bristol, University Walk, Bristol, BS8 1TR, United Kingdom.
² Groupe de Mécanique, Matériaux et Acoustique, Département de Physique, Université de Ngaoundéré, Ngaoundéré, B.P. 454, Cameroon.
³ Laboratoire Ondes et Milieux Complexes (LOMC), UMR CNRS 6294, Université du Havre, Le Havre, France.

PMID: 29716238
DOI: 10.1121/1.5032312

Abstract

This study deals with the deduction of parameters of Micro-Perforated Panel (MPP) systems from impedance tube data. It is shown that there is an ambiguity problem that exists between the MPP thickness and its open area ratio. This problem makes it difficult to invert the reflection coefficient data fitting and therefore to deduct the MPP parameters. A technique is proposed to reduce this ambiguity by using an equation that links the hole diameter to the open area ratio. Reflection coefficient data obtained for two specimens with different characteristics is employed for searching the MPP parameters using a simulated annealing algorithm. The results obtained demonstrate the effectiveness of this technique.