Guided inversion procedure thanks to a sensitivity analysis on porous road surfaces

Gaëlle Benoit (1) , Emmanuel Gourdon (2) , Christophe Heinkele (3)

1 CETE Normandie-Centre - Centre d'études techniques de l'équipement Normandie-Centre
2 DGCB - Département génie civil et batiment
3 CETE Est - Centre d'études techniques de l'équipement Est

Measuring the loss of acoustic performances allows to assess the extent of the clogging of a porous road surface. Here the inversion from in situ measurements on an equivalent fluid model is proposed in order to identify the microstructure related parameters such as porosity or resistivity. To achieve this task, a sensivity analysis of 2 models, based on a bayesian index, has been carried out to dissociate the effects of each parameter of the model. In the following, frequency ranges and conditions under which an inversion has the best chances to be successful is determinated. The models used in this paper are Biot-Allard model and Johnson-Champoux-Allard model, involving respectively 3 and 5 parameters. This analysis showed than on some frequency ranges only one parameter is influent. This helped to build an inversion procedure which will be tested with surface impedance measurements.

Mots clés: porous material; identification; sensitivity analysis

Domaines: Acoustique [physics.class-ph]

Gaëlle Benoit, Emmanuel Gourdon, Christophe Heinkele. Guided inversion procedure thanks to a sensitivity analysis on porous road surfaces. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810846⟩