Abstract
2-D sound diffusers installed with Helmholtz resonators have been investigated as top-edge noise barrier devices. The aim of this work was to study the effect of incorporating metasurfaces in sound diffusers on the broadband performance of noise barriers. This device can be exploited to use the astounding reflection and scattering properties of resonant metasurfaces and sound diffusers to achieve improvement in insertion loss. A three-dimensional indirect boundary element study was conducted to show promising improvement in noise barrier performance.
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