L'Efficacite d'un Ecran en Presence de Surfaces d'Impedance Differents
Mots-clés :
atmospheric acoustics, sound barrier, sound propagation, impedance discontinuity, insertion lossRésumé
Cet article aborde le problème de la propagation du son au-dessus d’un sol présentant une discontinuité d'impédance (type asphalte/ pelouse). Des développements récents ont conduit à des solutions théoriques variées qui font l'objet de comparaison avec des résultats expérimentaux obtenus tant en milieu semi-anéchoïque qu'en extérieur. Le modèle théorique jugé le plus fiable est ensuite appliqué à la prédiction des performances d'un écran bruit. Il permet de calculer l'efficacité d'un écran séparant des surfaces de nature différents.
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