Study on broadband low-frequency sound insulation of multi-channel resonator acoustic metamaterials

Abstract To solve the problem of low-frequency noise control in ship cabins, a new membrane-type acoustic metamaterial (MAM) with bulges on the surface of thin films is designed based on the characteristics of lightweight and low-frequency sound insulation of membrane-type acoustic metamaterials. The sound structure coupling module of COMSOL multiphysical field coupling software is used to analyse the sound insulation performance of MAMs. The sound insulation properties of the additional mass film and self-similar fractal convex structure are further discussed. The metamaterial structure studied in this paper has a better sound insulation effect than ordinary film, which provides strong technical support for ship cabin noise control.

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Low frequency sound absorption of adjustable membrane-type acoustic metamaterials

Applied Acoustics ◽

10.1016/j.apacoust.2021.108586 ◽

2022 ◽

Vol 188 ◽

pp. 108586

Author(s):

Tuo Xing ◽

Xiaoling Gai ◽

Junjuan Zhao ◽

Xianhui Li ◽

Zenong Cai ◽

...

Keyword(s):

Sound Absorption ◽

Low Frequency ◽

Acoustic Metamaterials ◽

Frequency Sound ◽

Membrane Type

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Fractal Acoustic Metamaterials with Subwavelength and Broadband Sound Insulation

Shock and Vibration ◽

10.1155/2019/1894073 ◽

2019 ◽

Vol 2019 ◽

pp. 1-7

Author(s):

Yu Liu ◽

Meng Chen ◽

Wenshuai Xu ◽

Tao Yang ◽

Dongliang Pei ◽

...

Keyword(s):

Low Frequency ◽

Sound Insulation ◽

Acoustic Metamaterials ◽

The Finite Element Method ◽

Transmission Losses ◽

Effective Parameters ◽

Retrieval Method ◽

Sound Control ◽

S Parameter ◽

Broadband Sound

We construct new fractal acoustic metamaterials by coiling up space, which can allow subwavelength-scale and broadband sound insulation to be achieved. Using the finite element method and the S-parameter retrieval method, the band structures, the effective parameters, and the transmission losses of these acoustic metamaterials with different fractal orders are researched individually. The results illustrate that it is easy to form low-frequency bandgaps using these materials and thus achieve subwavelength-scale sound control. As the number of fractal orders increase, more bandgaps appear. In particular, in the ΓX direction of the acoustic metamaterial lattice, more of these wide bandgaps appear in different frequency ranges, thus providing broadband sound insulation and showing promise for use in engineering applications.

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

AIP Advances ◽

10.1063/1.4942513 ◽

2016 ◽

Vol 6 (2) ◽

pp. 025116 ◽

Cited By ~ 23

Author(s):

Kuan Lu ◽

Jiu Hui Wu ◽

Dong Guan ◽

Nansha Gao ◽

Li Jing

Keyword(s):

Low Frequency ◽

Sound Insulation ◽

Acoustic Metamaterial ◽

Frequency Sound ◽

Membrane Type

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Hybrid acoustic metamaterial as super absorber for broadband low-frequency sound

Scientific Reports ◽

10.1038/srep43340 ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 58

Author(s):

Yufan Tang ◽

Shuwei Ren ◽

Han Meng ◽

Fengxian Xin ◽

Lixi Huang ◽

...

Keyword(s):

Energy Dissipation ◽

Absorption Coefficient ◽

Sound Absorption ◽

Low Frequency ◽

Functional Materials ◽

Theoretical Method ◽

Acoustic Metamaterials ◽

Mechanical Stiffness ◽

Acoustic Metamaterial ◽

Frequency Sound

Abstract A hybrid acoustic metamaterial is proposed as a new class of sound absorber, which exhibits superior broadband low-frequency sound absorption as well as excellent mechanical stiffness/strength. Based on the honeycomb-corrugation hybrid core (H-C hybrid core), we introduce perforations on both top facesheet and corrugation, forming perforated honeycomb-corrugation hybrid (PHCH) to gain super broadband low-frequency sound absorption. Applying the theory of micro-perforated panel (MPP), we establish a theoretical method to calculate the sound absorption coefficient of this new kind of metamaterial. Perfect sound absorption is found at just a few hundreds hertz with two-octave 0.5 absorption bandwidth. To verify this model, a finite element model is developed to calculate the absorption coefficient and analyze the viscous-thermal energy dissipation. It is found that viscous energy dissipation at perforation regions dominates the total energy consumed. This new kind of acoustic metamaterials show promising engineering applications, which can serve as multiple functional materials with extraordinary low-frequency sound absorption, excellent stiffness/strength and impact energy absorption.

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Low frequency sound insulation using stiffness control with honeycomb panels

Applied Acoustics ◽

10.1016/j.apacoust.2006.12.001 ◽

2008 ◽

Vol 69 (4) ◽

pp. 293-301 ◽

Cited By ~ 46

Author(s):

C.F. Ng ◽

C.K. Hui

Keyword(s):

Low Frequency ◽

Sound Insulation ◽

Frequency Sound ◽

Stiffness Control

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Low frequency sound insulation performance of asymmetric coupled-membrane acoustic metamaterials

Multidiscipline Modeling in Materials and Structures ◽

10.1108/mmms-06-2018-0110 ◽

2019 ◽

Vol 15 (5) ◽

pp. 1006-1015

Author(s):

Mengna Cai ◽

Hongyan Tian ◽

Haitao Liu ◽

Yanhui Qie

Keyword(s):

Low Frequency ◽

Sound Insulation ◽

Asymmetric Structure ◽

Insulation Material ◽

Metamaterial Structure ◽

Content Type ◽

Acoustic Metamaterial ◽

Frequency Sound ◽

Membrane Type ◽

Insulation Performance

Purpose With the development of the modern technology and aerospace industry, the noise pollution is remarkably affecting people’s daily life and has been become a serious issue. Therefore, it is the most important task to develop efficient sound attenuation barriers, especially for the low-frequency audible range. However, low-frequency sound attenuation is usually difficult to achieve for the constraints of the conventional mass-density law of sound transmission. The traditional acoustic materials are reasonably effective at high frequency range. This paper aims to discuss this issue. Design/methodology/approach Membrane-type local resonant acoustic metamaterial is an ideal low-frequency sound insulation material for its structure is simple and lightweight. In this paper, the finite element method is used to study the low-frequency sound insulation performances of the coupled-membrane type acoustic metamaterial (CMAM). It consists of two identical tensioned circular membranes with fixed boundary. The upper membrane is decorated by a rigid platelet attached to the center. The sublayer membrane is attached with two weights, a central rigid platelet and a concentric ring with inner radius e. The influences of the distribution and number of the attached mass, also asymmetric structure on the acoustic attenuation characteristics of the CMAM, are discussed. Findings In this paper, the acoustic performance of asymmetric coupled-membrane metamaterial structure is discussed. The influences of mass number, the symmetric and asymmetry structure on the sound insulation performance are analyzed. It is shown that increasing the number of mass attached on membrane, structure exhibits low-frequency and multi-frequency acoustic insulation phenomenon. Compared with the symmetrical structure, asymmetric structure shows the characteristics of lightweight and multi-frequency sound insulation, and the sound insulation performance can be tuned by adjusting the distribution mode and location of mass blocks. Originality/value Membrane-type local resonant acoustic metamaterial is an ideal low-frequency sound insulation material for its structure is simple and lightweight. How to effectively broaden the acoustic attenuation band at low frequency is still a problem. But most of researchers focus on symmetric structures. In this study, the asymmetric coupled-membrane acoustic metamaterial structure is examined. It is demonstrated that the asymmetric structure has better sound insulation performances than symmetric structure.

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