|
|
||
|
|
|
|
Fig. 2: Pictures of the tested configurations. (a) Bare panel. (b) D1 distribution of resonators. (c) D2 distribution of resonators. (d) D3 distribution of resonators. (e) Panel fully covered by melamine foam. (f) Close-up view of the panel equipped with D3 distribution of resonators before mounting the lateral melamine foam piece.
FROM:
Christophe Droz (1), Olivier Robin (2), Mohamed Ichchou (1) and Noureddine Atalla (2)
(1) Vibroacoustics & Complex Media Research Group, LTDS – CNRS UMR 5513, Ecole Centrale de Lyon, France
(2) Groupe d'acoustique de l'Université de Sherbrooke, Faculté de génie, Département de génie mécanique, Sherbrooke, Canada
“Improving sound transmission loss at ring frequency of a curved panel using tunable 3D-printed small-scale resonators”, The Journal of the Acoustical Society of America 145(1), EL72 (January 2019); https://doi.org/10.1121/1.5088036
ABSTRACT: An important dip in the sound transmission loss of curved panels occurs at the ring frequency. The relevance of using small-scale resonators to solve this issue is experimentally demonstrated on an aircraft sidewall panel. The effect of varying the spatial distribution of single frequency resonators (including combination with a broadband soundproofing treatment), as well as using multi-frequency resonators with a fixed spatial distribution is studied. Large improvement of the measured sound transmission loss under a diffuse acoustic field excitation is obtained around the ring frequency with limited added mass and very small alteration of the overall sound insulation performance.
Page 219 / 227