Acoustic meta-silencer: Toward enabling ultrawide-band air-permeable noise barrier

Abstract

In this article, we have first presented a metasurface design methodology by coupling the acoustic cavity to the coiled channel. The geometrical design parameters in this structure are subsequently studied both analytically and numerically to identify a road map for silencer design. Next, upon tuning the design parameters, we have introduced an air-permeable noise barrier capable of sound silencing in the ultrawide band of the frequency. It is has been shown that the presented metasurface can achieve +10 dB sound transmission loss from 170 Hz to 1330 Hz (≈3 octaves). Furthermore, we have numerically studied the ventilation and heat transfer performance of the designed metasurface. Enabling noise mitigation by leveraging the proposed metasurface opens up new possibilities ranging from residential and office noise reduction to enabling ultralow noise fan, propellers, and machinery.

Retrieving Effective Acoustic Impedance and Refractive Index for Size Mismatch Samples

“…The most-reported acoustic metamaterials in the literature are (i) coiling-up space 1,2 , (ii) Helmholtzresonator-like 3 , and (iii) membrane-type structures [4][5][6] . These 2D 7 and 3D 8 structures have shown strong abilities in modulating the reflected [9][10][11] and transmitted [12][13][14] acoustic waves to improve the wave manipulation [15][16][17][18][19][20] , and sound absorption and attenuation [21][22][23] .…”