| Autor: |
Dupont Samuel, Sanalatii Maryna, Melon Manuel, Robin Olivier, Berry Alain, Le Roux Jean-Christophe |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Acta Acustica, Vol 7, p 26 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2681-4617 |
| DOI: |
10.1051/aacus/2023021 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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