Numerical and analytical solutions for sound propagation and absorption in porous media at high sound pressure levels

Zhang, Chao; Chen, Tianning; Zhao, Yuyuan; Zhang, Weiyong; Zhu, Jian

doi:10.1121/1.4739439

Cited by 11 publications

(5 citation statements)

References 22 publications

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“…In recent years, the increasing interest in various applications of nonlinearity in porous materials has attracted the attention of researchers. For example, porous metals have demonstrated great potential as sound absorbers at high sound pressure levels (Zhang et al, 2012). Granular materials, including soils, rocks and gassy sediments, are other examples of typical porous materials that show a higher degree of nonlinearity than water due to their structural inhomogeneity.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear wave propagation in porous materials based on the Biot theory

Tong

Liu

Geng

et al. 2017

The Journal of the Acoustical Society of America

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Nonlinearity must be considered with some porous granular media because of the large deformation under seismic waves. In this study, the propagation of nonlinear waves in porous media is studied based on the Biot theory and the governing equations are obtained by the Lagrangian formulation. Three new nonlinear parameters are introduced to consider the coupled nonlinearity between the solid and fluid components in porous media. It is shown that an additional nonlinear wave with a double frequency is generated by the coupling effect of linear fast and slow waves. When only a shear wave is applied at the source, no double-frequency nonlinear wave is predicted and three nonlinear longitudinal waves are generated. On the basis of the practical case studies, the effect of strong nonlinearity is computed under the influence of a one-dimensional single longitudinal wave source and a single shear wave source.

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Section: Introductionmentioning

confidence: 99%

Nonlinear wave propagation in porous materials based on the Biot theory

Tong

Liu

Geng

et al. 2017

The Journal of the Acoustical Society of America

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“…Using structures with deep sub-wavelength thickness to achieve perfect absorption is a challenge for conventional sound absorbers due to achieving a better sound absorption performance in the low-frequency range, the conventional sound absorbers often require a relatively large volume, which results in limited practical applications. [1][2][3][4] The emergence of acoustic metamaterials and metasurfaces [5][6][7][8][9][10] has significantly broadened the field of sound absorption research, providing many fascinating ways to control acoustic waves, and proposing many perfect sound absorbers with compact structures. [11][12][13][14] Thin-film/sheet-type metamaterials are one of the important approaches to achieving perfect sound absorption.…”

Section: Introductionmentioning

confidence: 99%

New-parallel connection of the Helmholtz resonator with embedded apertures for low-frequency broadband sound absorption

Zhang

Chen

Xin

et al. 2022

Jpn. J. Appl. Phys.

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We designed/proposed kinds of new-parallel connection of the Helmholtz resonator with embedded apertures. The design rule of the resonator, aperture and length of the embedded hole has much influence on the sound absorption characteristics of the metamaterials. The multiple nearly perfect sound absorption peaks in a wide frequency band were obtained. The results show that by accurately balancing the coupling parameters of the new-parallel connection of the Helmholtz resonator with embedded apertures, the resonators can have continuous excellent sound absorption performance in multiple frequency bands. The frequency of the absorption peak can be controlled by adjusting the geometric parameters of the resonator, the absorption bandwidth can also be flexibly adjusted with a fixed thickness. The working wavelength of the designed new-parallel connection of Helmholtz resonator with embedded apertures is approximately 57 times its total thickness (43 mm), and the average sound absorption coefficient can be as high as 0.8.

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“…This design can be embedded within the structure of the part rather than having to use two separate bulky mechanisms; one for vibration isolation and one for acoustic isolation. For example, to reduce the noise and vibration radiated from a wall, a designer would have to develop and use a membrane-plate/porous metamaterial for sound isolation and a phononic crystal for mechanical vibration isolation 21 – 23 , seperately; this design would be complicated, expensive and bulky. The intrinsically lightweight nature of metamaterials will provide extra savings in mass in comparison to conventional designs, thus allowing for higher mobility and flexibility in manufacturing and building construction.…”

Section: Introductionmentioning

confidence: 99%

Metamaterials for simultaneous acoustic and elastic bandgaps

Elmadih

Chronopoulos

Zhu

2021

Sci Rep

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In this work, we present a single low-profile metamaterial that provides bandgaps of acoustic and elastic waves at the same time. This was done by ensuring impedance mismatch in two different domains, the fluid domain where the acoustic waves propagate and the solid domain where the elastic waves propagate. Through creatively designing the metamaterial, waves of certain nature and frequencies of interest were completely blocked in the solid and fluid domains simultaneously. The simulation results showed bandgaps with acoustic waves attenuation below 5 kHz and elastic waves attenuation below 10 kHz. The acoustic and elastic dispersion curves of the metamaterials were calculated for various designs with various diameters and neck lengths, and the bandgaps were calculated. These parameters can be used as means for tuning both the acoustic and elastic bandgaps. A representative design of the metamaterial was manufactured on a laser powder bed fusion system and the dynamic performance was measured at various points. The measurements were carried out using a dynamic shaker setup and the dynamic performance was in good agreement with the numerical modelling results. Such metamaterials can be used for simultaneous acoustic and elastic attenuation, as well as saving in space and material consumption, in various fields including building construction, automobile, aerospace and rocket design.

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Numerical and analytical solutions for sound propagation and absorption in porous media at high sound pressure levels

Cited by 11 publications

References 22 publications

Nonlinear wave propagation in porous materials based on the Biot theory

Nonlinear wave propagation in porous materials based on the Biot theory

New-parallel connection of the Helmholtz resonator with embedded apertures for low-frequency broadband sound absorption

Metamaterials for simultaneous acoustic and elastic bandgaps

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