Noise control by sonic crystal barriers made of recycled materials

TL;DR

This paper investigates noise barriers constructed from sonic crystals using recycled materials, demonstrating their effectiveness through measurements of sound reflection and transmission, and highlighting their potential for environmentally friendly noise control solutions.

Contribution

It introduces a novel design of noise barriers made of recycled porous cylinders arranged in sonic crystal configurations, with experimental validation of their acoustic attenuation properties.

Findings

Porous cylinders effectively attenuate noise through combined absorption and reflection.

Measurements show significant reduction in sound transmission with optimized barrier design.

Recycled materials can be used to create environmentally sustainable noise barriers.

Abstract

A systematic study of noise barriers based on sonic crystals made of cylinders that use recycled materials like absorbing component is here reported. The barriers consist of only three rows of perforated metal shells filled with rubber crumb. Measurements of reflectance and transmittance by these barriers are reported. Their attenuation properties result from a combination of sound absorption by the rubber crumb and reflection by the periodic distribution of scatterers. It is concluded that porous cylinders can be used as building blocks whose physical parameters can be optimized in order to design efficient barriers adapted to different noisy environments.