A multi-layer overlapping structure for continuous broadband acoustic wave absorption at lower-frequencies

Zhu, Junzhe; Qu, Yegao; Su, Heng; Zhang, Junxian; Meng, Guang

doi:10.1016/j.apacoust.2021.108496

Cited by 10 publications

(5 citation statements)

References 31 publications

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“…Examples include space-coiling structures, 17 subwavelength and labyrinthine absorbers, 18 sandwich panels, 19,20 and tubular structures. 21 In turn, numerous lattice structures also function as multi-layered HRs. These include dense truss lattices, 14,22 plate lattices with pores, 14,[23][24][25] and layer-by-layered perforated plate lattices.…”

Section: New Conceptsmentioning

confidence: 99%

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Harnessing cavity dissipation for enhanced sound absorption in Helmholtz resonance metamaterials

Chua

Zhai

2023

Mater. Horiz.

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Section: New Conceptsmentioning

confidence: 99%

“…Methods include incorporating heterogeneous cells in parallel, 32 series, 20 and hierarchically. 21,33,34 Despite their effectiveness, these methods rely on additive steps and may not be practical for engineering applications where size and mass constraints are important factors to consider.…”

Section: New Conceptsmentioning

confidence: 99%

Harnessing cavity dissipation for enhanced sound absorption in Helmholtz resonance metamaterials

Chua

Zhai

2023

Mater. Horiz.

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“…A single HR has a high acoustic absorption efficiency over a narrow resonant frequency range, which makes its practical application in the field of noise control difficult. A common solution is to use multiple channels of HRs [35,36]. It is well known that composite honeycomb sandwich structures are widely applied in aircrafts, ships, trains, and other fields due to its excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Development of ultra-broadband sound absorber based on double-layered irregular honeycomb microperforated panel

Mao

et al. 2023

Phys. Scr.

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In this study, a broadband sound absorber was developed using a double-layered irregular honeycomb microperforated panel (MPP) structure and a particle swarm optimization (PSO) algorithm to address the issue of broadband sound absorption of MPPs. An acoustic impedance model of the designed sound absorber and an optimization algorithm were implemented to obtain the structural configuration parameters for quasi-perfect sound absorption. The coupling effect between the resonant elements and the optimized structural configuration parameters enabled broadband and high-efficiency sound absorption. The impedance tube experimental results demonstrated an excellent broadband sound absorption level within the range of linear acoustics, and the designed triad and tetrad structures exhibited more than 70% absorption efficiency in the range of 609–4 002 Hz and 518–5 162 Hz, respectively. This study provides a design method and insights into the design, promotion, and application of broadband sound absorbers.

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“…Numerical simulations and experiments showed that the absorption coefficient of the structure is higher than 0.7 within 600-1200 Hz. Furthermore, Zhu et al 27 developed a multi-layer overlapping absorption structure based on Helmholtz resonator, and the sound absorption performance of the structure was discussed through numerical simulations and experiments. The results demonstrated that the structure with four layers of overlapping unit cells exhibits excellent sound absorption characteristics within 271-450 Hz.…”

Section: Introductionmentioning

confidence: 99%

Design of a broadband metasurface sound absorber based on Hilbert fractal

Zhang

Zhao

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, a new fractal-based broadband metasurface absorber is developed, which is based on the excellent space-filling ability of the Hilbert fractal. Each unit cell in absorber consists of a micro perforated panel (MPP) and a coplanar coiled cavity. In order to gain a deep insight into the sound absorption mechanism and perform a rapid design, a theoretical model for analyzing the sound absorption characteristics of the unit cell is established, in which the Fok function is used to account for the coupling effect between holes. Afterward, the absorption mechanism as well as the effects of parameter variations on absorption characteristics are investigated. To increase the space utilization, each unit cell is arranged in space according to the Hilbert fractal curve. Consequently, a metasurface absorber with 6 detuned unit cells is constructed. The multiple resonant cavities with dissimilar lengths can provide peak absorptions at multiple frequencies, thereby broadening the attenuation frequency range. Finally, the absorption performance of the designed absorber is obtained by theoretical calculations, finite element (FEM) simulations and experimental measurements, respectively. The experimental results show that a continuous absorption spectrum is achieved in the range of 855–1359 Hz with absorption coefficient above 0.8 under a deeply sub-wavelength thickness (22.2 mm). This study provides an effective way for the design of a space-limited broadband absorber. With the advantages of ultrathin thickness, broadband, and compactness, the developed fractal-based metasurface absorber has great potential in the field of noise reduction.

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A multi-layer overlapping structure for continuous broadband acoustic wave absorption at lower-frequencies

Cited by 10 publications

References 31 publications

Harnessing cavity dissipation for enhanced sound absorption in Helmholtz resonance metamaterials

Harnessing cavity dissipation for enhanced sound absorption in Helmholtz resonance metamaterials

Development of ultra-broadband sound absorber based on double-layered irregular honeycomb microperforated panel

Design of a broadband metasurface sound absorber based on Hilbert fractal

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