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

Tang, Yufan, Ren, Shuwei, Meng, Han, Xin, Fengxian, Huang, Lixi, Chen, Tianning, Zhang, Chuanzeng and Lu, Tian Jian (2017) Hybrid acoustic metamaterial as super absorber for broadband low-frequency sound. Scientific Reports, 7 (1). ISSN 2045-2322

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Official URL: https://doi.org/10.1038/srep43340

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.

Item Type: Article
Subjects: H100 General Engineering
H300 Mechanical Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 17 Aug 2020 09:46
Last Modified: 17 Aug 2020 10:00
URI: http://nrl.northumbria.ac.uk/id/eprint/44101

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