Transport noise reduction by low height sonic crystal noise barriers

Faouzi Koussa , Jérôme Defrance (1) , Philippe Jean (1) , Philippe Blanc-Benon (2)

1 CSTB - Centre Scientifique et Technique du Bâtiment
2 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique

Noise barriers along roads and railways are one of the existing solutions to protect inhabitants from noise. In this research we attempt to create quiet areas in cities using sonic crystal noise barriers. For aesthetic and security aspects, such protections do not exceed a size of 1m×1m in a vertical section. Cylindrical scatterers with added acoustical properties of resonance and absorption are used in this work to improve the acoustic performance of low height sonic crystal barriers. Numerical simulations, using a 2D Boundary Element Method (BEM), are carried out to evaluate their acoustic properties in terms of insertion loss. Our results show that the effectiveness of low height sonic crystal noises barriers is significant for road and tramway noise over the entire frequency range of study.

Mots clés: sonic crystal; Transport noise; BEM; Insertion loss

Domaines: Acoustique [physics.class-ph]

Faouzi Koussa, Jérôme Defrance, Philippe Jean, Philippe Blanc-Benon. Transport noise reduction by low height sonic crystal noise barriers. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810551⟩