Sound transmission loss of a Helmholtz Resonator-based acoustic metasurface

This paper presents a study of sound transmission loss through a Helmholtz resonator-based acoustic metasurface. The advantage given by the metasurface i.e. the superiority of refracting waves to any desired direction with less energy loss is used purposely to improve the sound transmission loss performance of the system. The acoustic metasurface is formed according to the periodic cell shape of the Helmholtz resonator. Parametric studies are conducted to investigate which design variable is sensitive to the desired noise reduction including the effect of the number of cells, the thickness of the metasurface, and multilayering. Moreover, wave propagation through the metasurface is visually shown to observe the refraction more clearly. Experimental validation is also conducted to demonstrate the effectiveness of the proposed design and numerical results. (c) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This paper presents a study on the impact of Helmholtz resonator-based acoustic metasurface on sound transmission loss. By optimizing the design variables of the metasurface, such as the number of cells, thickness, and multilayering, the noise reduction performance of the system can be improved. Experimental validation and numerical results demonstrate the effectiveness of the proposed design.