Analysis of the sound absorption characteristics of the curved microperforated panel with elastically restrained edges

Wang, Gang; Zhang, Yongfeng; Sheng, Zhehao; Zhu, Ziyuan; Li, Guofang; Ni, Junfang

doi:10.1016/j.tws.2022.110147

Cited by 11 publications

(2 citation statements)

References 62 publications

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“…Up to now, vibrational effects have essentially been addressed on single-layer micro-perforated absorbers of an infinite extent [14,15]. Several works have also analyzed the interaction between the first MPP modes and the main Helmholtz resonance [16][17][18][19][20][21][22][23], but not with a set of Helmholtz-type resonances induced by acoustic fishnets [5][6][7] or functionally graded multi-layered metamaterials [24][25][26][27][28][29], where the MPPs are assumed to be rigid.…”

Section: Introductionmentioning

confidence: 99%

“…This model was further applied to a finite flexible MPP simply supported in a circular duct to study the panel-type absorption peaks [16]. The influence of the structural and acoustic resonances was studied for widening the absorption bandwidths of flexible MPP absorbers [17,18], eventually curved [19] with elastically restrained edges using a modal superposition method [20]. Bolton [21] analyzed how the modal behavior of a membrane is modified by the perforations.…”

Section: Introductionmentioning

confidence: 99%

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Vibrational Effects on the Acoustic Performance of Multi-Layered Micro-Perforated Metamaterials

Maury,

Bravo

2023

Vibration

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Broadband noise reduction over the low–mid frequency range in the building and transportation sectors requires compact lightweight sound absorbers of a typical subwavelength size. The use of multi-layered, closely spaced (micro-)perforated membranes or panels, if suitably optimized, contributes to these objectives. However, their elasticity or modal behaviors often impede the final acoustical performance of the partition. The objective of this study is to obtain insights into the vibrational effects induced by elastic limp membranes or panel volumetric modes on the optimized sound absorption properties of acoustic fishnets and functionally graded partitions (FGP). The cost-efficient global optimization of the partitions’ frequency-averaged dissipation is achieved using the simulated annealing optimization method, while vibrational effects are included through an impedance translation method. A critical coupling analysis reveals how the membranes or panel vibrations redistribute the locations of the Hole-Cavity resonances, as well as their cross-coupling with the panels’ first volumetric mode. It is found that elastic limp micro-perforated membranes broaden the pass-band of acoustic fishnets, while smoothing out the dissipation ripples over the FGP optimization bandwidth. Moreover, the resonance frequency of the first panels mode sets an upper limit to the broadband optimization of FGPs, up to which a high dissipation, high absorption, and low transmission can be achieved.

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