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arXiv · 2106.02255

Broadband and intense sound transmission loss by a coupled-resonance acoustic metamaterial

David Roca·Mahmoud I. Hussein
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Abstract

The advent of acoustic metamaterials opened up a new frontier in the control of sound transmission. A key limitation, however, is that an acoustic metamaterial based on a single local resonator in the unit cell produces a restricted narrow-band attenuation peak; and when multiple local resonators are used the emerging attenuation peaks -- while numerous -- are each still narrow and separated by pass bands. Here, we present a new acoustic metamaterial concept that yields a sound transmission loss through two antiresonances -- in a single band gap -- that are fully coupled and hence provide a broadband attenuation range; this is in addition to delivering an isolation intensity that exceeds 90 decibels for both peaks. The underlying coupled resonance mechanism is realized in the form of a single-panel, single-material pillared plate structure with internal contiguous holes$-$a practical configuration that lends itself to design adjustments and optimization for a frequency range of interest, down to sub-kilohertz, and to mass fabrication.

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David Roca, Mahmoud I. Hussein. 2021-06-04. Broadband and intense sound transmission loss by a coupled-resonance acoustic metamaterial. https://doi.org/10.1103/physrevapplied.16.054018

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