On the experimental characterization of the acoustic properties of Ecophon porous material
Résumé
The acoustic properties of Ecophon material, type ?Industry Modus S?, were characterized by means of experiments in an impedance tube and a flow resistivity test set-up. The assessment of the physical and acoustical characteristics of this material are of importance since it has been considered as a reference sample for the tests carried out in impedance tubes and reverberation rooms for the DENORMS Round Robin Test and it is going to be proposed as a "reference absorber" for checking the quality of the reverberant rooms in an updated version of the ISO 354 standard. The experimental data of the absorption coefficient was fitted by means of two types of models: a Johnson-Champoux-Allard (JCA) equivalent fluid model and a poroelastic Biot model to obtain material parameters. Numerical finite element models of the impedance tube were used to verify the correctness of the JCA and Biot fits. It was concluded that a resonance effect of the porous skeleton is better captured by the Biot model, but that the JCA model is computationally much faster and covers most of the acoustic behaviour of the Ecophon material as well.
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