Sound absorption mapping of highway noise barrier

Andrea Grosso (1)

1 Microflown Technologies

Sound propagation from highway to the urban areas can be reduced using noise barriers. The general computational modeling takes typically into account sound ray lines, reflection and diffraction, although the absorption distribution over the surface in not considered. The sound absorption coefficient can be calculated using a PU probe, by the impedance measured “in situ” close by the surface. Well known methods are available on the market for estimating the sound absorption by some smaller sample, which is not always relevant for the real condition. A new methodology called Scan & paint enable absorption mapping of big surfaces “in situ”, enabling optimization of noise barriers. In the first section of this paper the methodology for the measurement is explained. Furthermore a comparison with an “in laboratory” measurement is compared with the results.

Mots clés: Noise barrier; absorption; particle velocity; Scan & paint

Domaines: Acoustique [physics.class-ph]

Andrea Grosso. Sound absorption mapping of highway noise barrier. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810724⟩