Ultra-broadband and nonlinear robust sound absorption based on ultra-microperforated panel

Zheng, Mingyang; Chen, Chao; Li, Xiaodong

doi:10.1016/j.jsv.2024.118262

Cited by 3 publications

(1 citation statement)

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“…To improve the sound absorption performance of MPP when MPPs and HRs are not coupled with other structures, serial and parallel connections of multiple MPPs can be utilized to broaden their absorption bandwidth; however, this results in a larger absorber [4][5][6]. Additionally, the sound-absorption performance of traditional MPPs can be enhanced by altering the shape [7][8][9], designing curved and folded backing cavities [10,11], coupling MPPs with different porosities [12], and employing ultrafine apertures [13]. Similarly, to widen the bandwidth of HR, methods such as the parallel connection of multiple HRs [14][15][16] and hierarchical serial connection of HRs [17,18] can be employed, once again resulting in a larger absorber.…”

Section: Introductionmentioning

confidence: 99%

Development of a low-frequency broadband sound absorber based on a micro-perforated panel coupled with the Helmholtz resonator system

Li,

Wu,

Mao

et al. 2024

Phys. Scr.

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In the field of vibration and noise reduction, micro-perforated panel (MPP) structures and Helmholtz resonators (HR) play crucial roles as common sound-absorbing elements. However, independently applied MPP and HR structures cannot provide sufficiently wide absorption bandwidths at low frequencies. To achieve low-frequency broadband sound absorption, this study proposes a novel low-frequency broadband sound absorption structure (EMH) based on MPP and HR with a thickness of 40 mm to achieve a subwavelength, efficient, and compact design. We establish theoretical models of MPP and HR coupled systems, systematically analyze the sound absorption performance of same-element and different-element coupled structures, and employ the particle swarm optimization (PSO) algorithm to obtain structural parameters for efficient coupled sound absorption. Furthermore, we compare the sound absorption performance of three optimized coupled structures (MPP-coupled (SM), HR-coupled (SH), and MPP and HR-coupled) from the perspective of the theoretical calculation of the sound absorption coefficient and finite element analysis of the sound absorption mechanism. Finally, samples fabricated using 3D printing technology are tested in an impedance tube. The results demonstrate that efficient coupled sound absorption of MPP and HR can be achieved through parameter optimization. SH and SM exhibit nearly perfect sound absorption in the frequency ranges of 323–495 Hz and 615–1600 Hz, respectively, whereas the effective absorption bandwidth of EMH can reach 1225 Hz in the range of 200–1600 Hz. EMH shows superior low-frequency broadband sound absorption performance with a lightweight and simple structure, which holds the potential for application in low-frequency noise control.

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