Sound Absorption Enhancement by Thin Multi-Slit Hybrid Structures

Shu-Wei Ren, Han Meng, Feng-Xian Xin , Tian-Jian Lu

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8 Citations (Scopus)

Abstract

We report an extraordinary sound absorption enhancement in low and intermediate frequencies achieved by a thin multi-slit hybrid structure formed by incorporating micrometer scale micro-slits into a sub-millimeter scale meso-slit matrix. Theoretical and numerical results reveal that this exotic phenomenon is attributed to the noticeable velocity and temperature gradients induced at the junctures of the micro- and meso-slits, which cause significant loss of sound energy as a result of viscous and thermal effects. It is demonstrated that the proposed thin multi-slit hybrid structure with micro-scale configuration is capable of controling low frequency noise with large wavelength, which is attractive for applications where the size and weight of a sound absorber are restricted.
Original languageEnglish
Article number014302
Number of pages5
JournalChinese Physics Letters
Volume32
Issue number1
DOIs
Publication statusPublished - Jan 2015
Externally publishedYes

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