A lightweight low-frequency sound insulation membrane-type acoustic metamaterial

Lu, Kuan; Wu, Jiu Hui; Guan, Dong; Gao, Nansha; Li, Jing

doi:10.1063/1.4942513

Cited by 62 publications

(33 citation statements)

References 24 publications

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“…The definition may be broadly interpreted as systems or materials that display (as a whole) extraordinary properties not found in natural materials with respect to sound and vibration characteristics, such as negative apparent mass and/or bulk modulus. Metamaterials can show high transmission loss (TL) at low frequencies despite having low mass per unit area [8][9][10][11][12][13]. They owe this behaviour to internal subwavelength periodic structures.…”

Section: Introductionmentioning

confidence: 99%

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An analytical model for broadband sound transmission loss of a finite single leaf wall using a metamaterial

Torre

Brunskog

Henrı́quez

2020

The Journal of the Acoustical Society of America

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Acoustic metamaterials (AM) have emerged as an academic discipline within the last decade. When used for sound insulation, metamaterials can show high transmission loss at low frequencies despite having low mass per unit area. This paper investigates the possibility of using AMs for increasing the sound insulation of finite single leaf walls (SLW), focusing on the coincidence effect problem. Formulas are derived using a variational technique for the forced sound transmission of finite SLW with a coupled array of single degree of freedom resonators. An analytical model is presented for this simple case, and the effects of the band gap in sound transmission and radiation are analysed. Moreover, the influence of each parameter is studied giving way to an optimized way of designing this type of structures using constrained parameter optimization. Different objective functions are compared and discussed. Finally, some conclusions are drawn regarding the effectiveness of the proposed model, possible applications, and future work.

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Section: Introductionmentioning

confidence: 99%

“…Band gaps can be introduced into these structures by mounting an array of resonators to them. This type of construction has been studied and validated in recent years [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

An analytical model for broadband sound transmission loss of a finite single leaf wall using a metamaterial

Torre

Brunskog

Henrı́quez

2020

The Journal of the Acoustical Society of America

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“…A series of metamaterials of subwavelength thickness has been designed to achieve 100% absorption for the low-frequency sound. For example, the membrane-type metamaterials [1][2][3][4][5][6][7][8], due to the resonant nature, which has limited the practical applications.…”

Section: Introductionmentioning

confidence: 99%

A thin low-frequency broadband metasurface with multi-order sound absorption

Liu

et al. 2019

J. Phys. D: Appl. Phys.

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composed of an elastic membrane and rigid disks, can absorb nearly the whole incident sound energy at certain frequencies and their thicknesses are even less than the peak absorption wavelength by two orders of magnitude. Nevertheless, it is susceptible to the mechanical damage because of the soft membrane. The coiled-up space metamaterials [9][10][11][12][13][14][15][16][17][18], which can achieve extreme acoustic absorption performance by increasing the sound path, are another significant type of the acoustic metamaterials. The structure presented by Li et al can absorb the sound with a thickness of 1/223 of the wavelength [9]. However, most of these metamaterials can only obtain good absorption performance within a narrow frequency band AbstractWe present a theoretical and experimental realization of a thin multi-unit metasurface with multi-order sound absorption that exhibits a continuous near-perfect absorption spectrum in the broadband range of 450 Hz-1360 Hz. The metasurface unit is a perforated composite Helmholtz-resonator (PCHR) that is constructed by inserting one or more separating plates with a small hole into the interior of a Helmholtz resonator (HR). The multi-order sound absorption mechanism can be achieved so that with the original absorption peak and the structural size unchanged, multiple near-perfect peaks are obtained in higher frequencies by a PCHR unit. This extraordinary multi-peak performance is the result of the upgraded multi-degree-of-freedom system with the separating plates, which is explained well by the equivalent acoustic circuit. The specific absorption properties of the PCHR unit are investigated thoroughly with a theoretical approach similar to the plane wave expansion method, and verified via the finite element simulations. On this basis, by precisely balancing the parameters of each unit, the absorption bandwidth of the subwavelength 8-unit metasurface is dramatically broadened about 65% by the proposed mechanism. This work would offer a new guidance for the achievement of the wider absorption band and has great potential in engineering applications.

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“…These fascinating properties have opened the way to the development of compact sound absorbing materials. For example, membrane-type (Yang et al, 2008(Yang et al, , 2015Park et al, 2011;Mei et al, 2012;Lu et al, 2016;Gao et al, 2017) or scape-coiling (Liang and Li, 2012;Li et al, , 2013Li et al, , 2014Li et al, , 2015Xie et al, 2013Xie et al, , 2014Molerón et al, 2016;Krushynska et al, 2018) metamaterials are capable of totally absorbing sound at frequencies, when the corresponding wavelength is up to two orders of magnitude larger than their thickness. Rigidly-backed structures with Helmholtz resonators (HRs) (Jiménez et al, 2016(Jiménez et al, , 2017a) also act as perfect absorbers, if the critical coupling conditions are satisfied (Theocharis et al, 2014;Merkel et al, 2015;Groby et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Between Science and Art: Thin Sound Absorbers Inspired by Slavic Ornaments

Krushynska

2019

Front. Mater.

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Acoustic metamaterials have opened fascinating opportunities for manipulation of low-frequency sound and development of compact structures with broadband acoustic performance for noise mitigation applications, room and architectural acoustics. So far, several mechanisms have been studied to achieve perfect sound absorption at subwavelength frequencies, when structural dimensions are much smaller than the wavelength of incident waves. Here, we analyze two alternative approaches based on the use of interacting and coupled resonators in absorbing panels with the aim to reduce the panel thickness. We numerically demonstrate that proper designs of interacting resonators allow extending a single-peak absorption to broadband frequencies, while the use of coupled resonators enables broadband absorption at several frequency ranges. The proposed configurations are inspired by ancient Slavic folk patterns with delicate ligature, multi-layered structure, and concealed meaning. Our results open new possibilities for creating acoustic metamaterials with added art effects, which individualize occupied space and make absorbing panels more appealing for various applications.

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A lightweight low-frequency sound insulation membrane-type acoustic metamaterial

Cited by 62 publications

References 24 publications

An analytical model for broadband sound transmission loss of a finite single leaf wall using a metamaterial

An analytical model for broadband sound transmission loss of a finite single leaf wall using a metamaterial

A thin low-frequency broadband metasurface with multi-order sound absorption

Between Science and Art: Thin Sound Absorbers Inspired by Slavic Ornaments

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