Improvement of the Sound Absorption Performance of Sandwich Panel Using Inhomogeneous Micro Perforations

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Résumé

Sandwich structures are widely used in several fields because of their mechanical performance with low weight. In this paper, a sandwich panel made of a core and a top and a back panel is investigated using the finite element method. The core consists of 33 hexagonal cells and each cell is connected to a micro-perforation. To improve the sound absorption, inhomogeneous micro-perforations are considered within the top panel. It is shown that with homogenous micro-perforations made of the same diameter, the sound absorption coefficient presents only one resonant peak. When 2, 3 and 6 different sets of micro-perforation diameters are considered, the sound absorption coefficient presents respectively 2, 3 and 6 resonance peaks where the surface impedance is close to that of the air. When each micro-perforation diameter is different resulting in inhomogeneous distribution of micro-perforations within the top panel, the sound absorption frequency band is widened and the absorption coefficient value increases while without micro-perforations the absorption coefficient of the sandwich panel is zero over the entire frequency range. The studied structure can offer high mechanical stiffness and good sound absorption performance.

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Publié-e

2024-05-12

Comment citer

1.
Laly Z, Mechefske C, Ghinet S, Kone CT, Atalla N, Ashrafi B. Improvement of the Sound Absorption Performance of Sandwich Panel Using Inhomogeneous Micro Perforations. Canadian Acoustics [Internet]. 12 mai 2024 [cité 30 juin 2024];52(1). Disponible à: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/4159

Numéro

Vol. 52 No. 1 (2024): Proceedings of Acoustics Week in Canada 2024 Conference joint with 186th Meeting of the Acoustical Society of America

Rubrique

Actes du congrès de la Semaine canadienne d'acoustique

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