Broadband acoustic attenuation in microperforated meta-shells with ventilation

Jiaji Chen, Yonghui Zhang, Yukai Yu, Yao Zhai, Huy Nguyen, Sharon Tracy, Xiaoming Zhou*, Guoliang Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Achieving sound attenuation across a broad frequency range while maintaining adequate ventilation remains a significant challenge in acoustic engineering, as there exists a rigid trade-off between attenuation ability and ventilation. In this Letter, we propose a double-layered microperforated meta-shells to serve as broadband acoustic ventilation barrier. Multiple scattering theory is first employed to characterize sound attenuation performance of the proposed design in terms of both sound absorption and transmission loss, which is not reported before. Experimental result demonstrates a good enhancement of absorption due to the insertion of inner shell with a specific perforation rate of micro cores. The mechanism can be attributed to the inter-cell coupling, which is further utilized to devise a different configuration by wrapping the meta-shell with porous sponge. It is found that adding an extra layer of sponge can further improve the low-frequency attenuation performance. The proposed broadband sound barrier with effective ventilation can find potential applications in architectural acoustics and office noise insulation.

Original languageEnglish
Article number231701
JournalApplied Physics Letters
Volume122
Issue number23
DOIs
Publication statusPublished - 5 Jun 2023

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Chen, J., Zhang, Y., Yu, Y., Zhai, Y., Nguyen, H., Tracy, S., Zhou, X., & Huang, G. (2023). Broadband acoustic attenuation in microperforated meta-shells with ventilation. Applied Physics Letters, 122(23), Article 231701. https://doi.org/10.1063/5.0152725