AN APPROACH TO DIRECT AND INVERSE TIME-DOMAIN SCATTERING OF ACOUSTIC WAVES FROM RIGID POROUS MATERIALS BY A FRACTIONAL CALCULUS BASED METHOD
Résumé
In this paper direct and inverse time-domain scattering of ultrasonic pulses from a rigid, homogeneous and isotropic porous medium are investigated. The Green's function of the wave propagation of a transient field in one dimensional porous media is established. The solution of direct and inverse problems are given in the time domain by using the concept of fractional derivatives. The viscous and thermal losses of the medium are described by the Johnson and Allard models [1] [2] modified to be usable in the time domain. Experimental and numerical results are given as a validation of our model.
Domaines
Sciences de l'ingénieur [physics]
Origine : Fichiers produits par l'(les) auteur(s)