Theoretical analysis of the acoustical behaviour of roadside barriers with diffusive internal surfaces

Abstract

A theoretical analysis of the acoustical behaviour of parallel roadside barriers is performed. The effects due to multiple reflections occurring between them are examined when at least one of the two barriers has a diffusive rather than specular behaviour. A computational method pertinent to the study of acoustical fields within enclosed spaces and properly modified in order to take into account the contemporaneous presence of specular and diffusive boundary surfaces is described and utilized. Results relevant to the employment of barriers with specular and diffusive sound reflection characteristics differently coupled are discussed.