Issue |
Acta Acust.
Volume 7, 2023
|
|
---|---|---|
Article Number | 26 | |
Number of page(s) | 11 | |
Section | Acoustic Materials and Metamaterials | |
DOI | https://doi.org/10.1051/aacus/2023021 | |
Published online | 09 June 2023 |
Scientific Article
Measurement of the diffuse field sound absorption using a sound field synthesis method
1
Laboratoire d’Acoustique de l’Université du Mans (LAUM), UMR 6613, Institut d’Acoustique – Graduate School (IA-GS), CNRS, 72000 Le Mans Université, France
2
Centre de Transfert de Technologie du Mans (CTTM), 20 Rue de Thalès de Milet, 72000 Le Mans Cedex 09, France
3
Centre de Recherche Acoustique – Signal – Humain (CRASH), Université de Sherbrooke, 2500 Bd de l’Université, Sherbrooke J1K 2R1, QC, Canada
* Corresponding author: Manuel.Melon@univ-lemans.fr
Received:
16
December
2022
Accepted:
3
May
2023
A method for measuring the diffuse field sound absorption coefficient of a material using sound field synthesis is proposed. A planar loudspeaker array is first used to generate acoustic plane waves with variable incidence angle on the surface of a material under test. Using a two-microphone probe positioned closely to the sample’s surface, the angle-dependent sound absorption coefficients are then estimated. Finally, the diffuse field absorption coefficient is computed following Paris formula. Numerical simulations are used to evaluate the respective effects of the maximum incidence angle value and the number of individual incidence angles that are required for a robust calculation of the diffuse sound field absorption. Measurements are conducted on three different materials and compared with either simulation results obtained using the Johnson-Champoux-Allard theory, or with measurement results obtained using the standard reverberation chamber method. For all considered materials and over a wide frequency range, the proposed method leads to results that are in better agreement with theoretical predictions than those obtained using standardized methods.
Key words: Sound field synthesis / Measurement method / Absorption coefficient / Diffuse field
© The Author(s), Published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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