Low-frequency sound absorption of a metamaterial with symmetrical-coiled-up spaces

被引：115

作者：

Almeida, Gildean do N. ^{[1
]}

Vergara, Erasmo F. ^{[1
]}

Barbosa, Leandro R. ^{[1
]}

Brum, Ricardo ^{[1
]}

机构：

[1] Univ Fed Santa Catarina, Lab Vibrat & Acoust, Grad Program Mech Engn, Florianopolis, SC, Brazil

来源：

APPLIED ACOUSTICS | 2021年 / 172卷

关键词：

Low-frequency sound absorption; Acoustic metamaterial; Subwavelength absorber; Symmetrical labyrinth; TUBES;

D O I：

10.1016/j.apacoust.2020.107593

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

A theoretical, numerical and experimental investigation of a low-frequency acoustic absorber (100-600 Hz) is reported herein. The acoustic metamaterial is based on a micro-perforated panel coupled to a multi-cavity of coiled-up spaces that is similar to a symmetrical labyrinth. On considering the visco-thermal losses, the effect of increasing the number of symmetrically coiled-up spaces that determines the peak position of the sound absorption and allows a greater sound energy absorption is discussed theoretically and proven through numerical analysis (FEM). Prototypes were manufactured using 3D printing technology and evaluated in an impedance tube. The results for the sound absorption coefficient acquired in the desired frequency range were greater than 91% with relative bandwidth above 35%, in agreement with the analytical model. Therefore, it is demonstrated that the proposed absorber presents a scale of deep-subwavelength since its total thickness is 0.033 lambda. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：10

共 37 条

[1]

Allard J., 2009, Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials 2e

[2]

Allard J.F., 1994, The Journal of the Acoustical Society of America, V95, P2785, DOI [10.1121/1.409801, DOI 10.1121/1.409801]

[3]

[Anonymous], 2018, New acoustics based on metamaterials, DOI DOI 10.1007/978-981-10-6376-3

[4]

Bies DA, 2009, Engineering noise control: Theory and practice, VFourth

[5] Optimising the absorption and transmission properties of aircraft microperforated panels [J].

Bravo, Teresa ;

Maury, Cedric ;

Pinhede, Cedric .

APPLIED ACOUSTICS, 2014, 79 :47-57

[6] On the modelling of microslit panel absorbers [J].

Cobo, Pedro ;

de la Colina, Carlos ;

Simon, Francisco .

APPLIED ACOUSTICS, 2020, 159

[7] Multiple-Layer Microperforated Panels as Sound Absorbers in Buildings: A Review [J].

Cobo, Pedro ;

Simon, Francisco .

BUILDINGS, 2019, 9 (02)

[8]

Cox T., 2016, ACOUSTIC ABSORBERS D, DOI DOI 10.1201/9781315369211

[9] The use of slow waves to design simple sound absorbing materials [J].

Groby, J. -P. ;

Huang, W. ;

Lardeau, A. ;

Auregan, Y. .

JOURNAL OF APPLIED PHYSICS, 2015, 117 (12)

[10] Ultra-thin metamaterial for perfect and quasi-omnidirectional sound absorption [J].

Jimenez, N. ;

Huang, W. ;

Romero-Garcia, V. ;

Pagneux, V. ;

Groby, J. -P. .

APPLIED PHYSICS LETTERS, 2016, 109 (12)

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