title: Characterizing a porous road pavement using surface impedance measurement: a guided numerical inversion procedure.
abstract: This paper deals with a numerical procedure to identify the acoustical parameters of road pavement from surface impedance measurements. This procedure comprises three steps. First, a suitable equivalent fluid model for the acoustical properties porous media is chosen, the variation ranges for the model parameters are set, and a sensitivity analysis for this model is performed. Second, this model is used in the parameter inversion process, which is performed with simulated annealing in a selected frequency range. Third, the sensitivity analysis and inversion process are repeated to estimate each parameter in turn. This approach is tested on data obtained for porous bituminous concrete and using the Zwikker and Kosten equivalent fluid model. This work provides a good foundation for the development of non-destructive in situ methods for the acoustical characterization of road pavements.
authors: Laboratoire Régional des Ponts et Chaussées de Blois, Centre d'Etudes Techniques de l'Equipement Normandie-Centre, 11 rue Laplace CS2912 41029 Blois Cedex, France.
authors: Gaëlle
authors: G
authors: Benoit
authors: Laboratoire Régional des Ponts et Chaussées de Strasbourg, Centre d'Etudes Techniques de l'Equipement Est, 11, rue Jean Mentelin 67035 Strasbourg Cedex 2, France.
authors: Christophe
authors: C
authors: Heinkélé
authors: Laboratoire Génie Civil et Bâtiment LTDS Unité Mixte de Recherche CNRS 5513, Ecole Nationale des Travaux Publics de l'Etat, rue Maurice Audin 69518 Vaulx-en-Velin Cedex, France.
authors: Emmanuel
authors: E
authors: Gourdon