A Study on the Sound Absorption Performance of a Helmholtz Resonator Combined with Porous Materials

In this work, a hybrid acoustic material (HAM) is designed for broadband and low-frequency sound absorption based on the combination of two different materials: a porous layer (melamine foam) and a modified Helmholtz resonator with embedded necks (HRENs). Theoretical predictions, numerical simulations, and experimental measurements are conducted to investigate the acoustic characteristics of the HREN. The HAM absorption mechanism is presented to evaluate the broadband sound absorption by the impedance matching effect of the different structures. The results of experimental tests confirmed that the HAM has broadband sound absorption and presented good agreement with an equivalent fluid model and numerical simulations. Broadband sound absorption was comparatively evaluated by the broadband factor ([Formula: see text]), revealing the advantages due to the possible configurations of HAM in relation to HREN and melamine foam. In addition, the selection and dimensions of the HREN holes and the perforation ratio, in the range of 3%–10%, allow the hybrid sound absorber to achieve one absorption peak between 235 and 582 Hz with quasi-total absorption ([Formula: see text]). This work contributes to the understanding of sound wave propagation and broadband absorption in acoustic materials composed of different materials combined.

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Broadband and low-frequency sound absorption of modified Helmholtz resonator combined with porous layer addition

Vergara

Almeida

Barbosa

et al. 2022

Journal of Applied Physics

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A Study on the Sound Absorption Performance of a Helmholtz Resonator Combined with Porous Materials

Abstract: The helmholtz resonator with the perforated neck has demerits that the absorption performance is not so outstanding in an anti-resonance frequency and high frequency bandwidth. In order to overcome these problems, in the paper, a resonator combined with porous material is proposed.

Cited by 1 publication

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Broadband and low-frequency sound absorption of modified Helmholtz resonator combined with porous layer addition

Broadband and low-frequency sound absorption of modified Helmholtz resonator combined with porous layer addition

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