Gradually perforated porous materials backed with Helmholtz resonant cavity for broadband low-frequency sound absorption

2021 ◽  
Vol 263 ◽  
pp. 113647
Author(s):  
Xuewei Liu ◽  
Chenlei Yu ◽  
Fengxian Xin
Keyword(s):  
Porous Materials ◽  
Sound Absorption ◽  
Resonant Cavity ◽  
Low Frequency ◽  
Frequency Sound

scholarly journals Analysis of Sound Absorption Characteristics of Acoustic Ducts with Periodic Additional Multi-Local Resonant Cavities

Symmetry ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2233
Author(s):  
Junyi Liu ◽  
Ting Wang ◽  
Meixia Chen
Keyword(s):  
Sound Absorption ◽  
Transmission Loss ◽  
Resonant Cavity ◽  
Low Frequency ◽  
Additional Mass ◽  
Resonant Cavities ◽  
Absorption Frequency ◽  
Frequency Sound ◽  
Cavity Structure ◽  
Absorption Characteristics

With the aim of applying various Helmholtz resonant cavities to achieve low-frequency sound absorption structures, a pipe structure with periodic, additional, symmetrical, multi-local resonant cavities is proposed. A thin plate with additional mass is placed in the cylindrical Helmholtz resonant cavity structure to form a symmetric resonant cavity structure and achieve multi-local resonance. The simulation results show that the periodic structure proposed in this paper can produce multiple, high acoustic transmission loss peaks and multiple lower broadband sound absorption frequency bands in the low-frequency range. In this paper, this idea is also extended to the Helmholtz resonant cavity embedded with multiple additional mass plates. The results show that the periodic arrangement of the multi-local resonant symmetric cavity inserted into multiple plates with mass can significantly increase its transmission loss and show a better performance on low-frequency sound absorption characteristics.

Low frequency sound absorption of adjustable membrane-type acoustic metamaterials

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

A double porosity material for low frequency sound absorption

2020 ◽  
Vol 239 ◽  
pp. 111978 ◽  
Author(s):  
Honggang Zhao ◽  
Yang Wang ◽  
Dianlong Yu ◽  
Haibin Yang ◽  
Jie Zhong ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Low Frequency ◽  
Double Porosity ◽  
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.

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