Design and performance of ultra-broadband composite meta-absorber in the 200Hz-20kHz range

Nansha Gao*, Jing Liu, Jie Deng, Dongyang Chen, Qiaogao Huang, Guang Pan

*Corresponding author for this work

Research output: Indexed journal article Articlepeer-review

47 Citations (Scopus)

Abstract

In this study, a composite meta-absorber with a flexible size is proposed, and a genetic algorithm is used to optimize the geometric dimensions under normal incidence and free field conditions. With an overall thickness of 0.2 m, the quasi-perfect sound absorption is achieved in the 200 Hz - 20 kHz range. The sound pressure and sound intensity distributions inside the composite meta-absorber prove the incident sound wave is effectively localized inside the structure. Comparing the effective sound velocities in layers 1 and 10 with the sound velocity in air, it is possible to infer that the slow sound phenomenon is more pronounced at the bottom of THE composite meta-absorber, due to the different combinations of lateral plates and cavities. The coupling relationship between internal loss and radiation loss of the meta-absorber was revealed using the zero and pole method, proving the ultra-broadband and quasi-perfect sound absorption characteristics. Tests of the sound absorption coefficient in impedance tubes and reverberation chambers confirm the effective broadband sound absorption performance. The composite meta-absorber in this study can be directly used to reduce broadband noise. Moreover, it also provides ideas for the design of sound-absorbing metamaterials.

Original languageEnglish
Article number118229
JournalJournal of Sound and Vibration
Volume574
DOIs
Publication statusPublished - 31 Mar 2024
Externally publishedYes

Keywords

  • Composite meta-absorber
  • Johnson-Champoux-Allard model
  • Quasi-perfect sound absorption
  • Ultra-broadband design

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