An acoustic metamaterial composed of multi-layer membrane-coated perforated plates for low-frequency sound insulation

2015 ◽  
Vol 106 (15) ◽  
pp. 151908 ◽  
Author(s):  
Li Fan ◽  
Zhe Chen ◽  
Shu-yi Zhang ◽  
Jin Ding ◽  
Xiao-juan Li ◽  
...  
Keyword(s):  
Low Frequency ◽  
Sound Insulation ◽  
Perforated Plates ◽  
Acoustic Metamaterial ◽  
Frequency Sound ◽  
Layer Membrane

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

AIP Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 025116 ◽  
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

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

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.

Step-by-step structural design methods for adjustable low-frequency sound insulation based on infinite plate-type acoustic metamaterial panel

2020 ◽  
Vol 34 (21) ◽  
pp. 2050220
Author(s):  
Ying-Rui Ye ◽  
Xiao-Peng Wang ◽  
Tian-Ning Chen ◽  
Yong-Yong Chen
Keyword(s):  
Structural Design ◽  
Large Scale ◽  
Infinite Plate ◽  
Low Frequency ◽  
Design Methods ◽  
Single Frequency ◽  
Sound Insulation ◽  
Acoustic Metamaterial ◽  
Frequency Sound ◽  
Plate Type

With the development of acoustic metamaterials (AMM), more and more researchers focus on the study of plate-type acoustic metamaterial panel (PAMMP). With the goal of industrial applications, the structural design methods of large-scale PAMMP are important. In this research, we establish an infinite plate-type acoustic metamaterial panel (IPAMMP) model, and experimental and simulation results show that the sound transmission loss (STL) curves of IPAMMP and large-scale PAMMP have good consistency in an interested range. On this basis, a set of step-by-step structural design methods for single-frequency and multi-frequency sound insulation are proposed. By adjusting the structural parameters of IPAMMP, the single-frequency STL peak could be shifted. Further study shows that multiple STL peaks could be realized in the low-frequency range by placing different masses on IPAMMP. Finally, taking transformers 100 Hz, 200 Hz, 300 Hz, 400 Hz and 500 Hz as examples, the feasibility of the structural design methods is verified by simulation. Consequently, the proposed step-by-step structural design methods could address the single-frequency and multi-frequency sound insulation at a specific frequency, demonstrating adjustability.

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

AIP Advances ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 045321
Author(s):  
Chi Xu ◽  
Hui Guo ◽  
Yinghang Chen ◽  
Xiaori Dong ◽  
Hongling Ye ◽  
...  
Keyword(s):  
Low Frequency ◽  
Sound Insulation ◽  
Acoustic Metamaterials ◽  
Frequency Sound

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

2017 ◽  
Vol 7 (1) ◽  
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.

scholarly journals Erratum: Hybrid acoustic metamaterial as super absorber for broadband low-frequency sound

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yufan Tang ◽  
Shuwei Ren ◽  
Han Meng ◽  
Fengxian Xin ◽  
Lixi Huang ◽  
...  
Keyword(s):  
Low Frequency ◽  
Acoustic Metamaterial ◽  
Frequency Sound ◽  
Super Absorber
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