3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-315-C5-318
Un modèle efficace pour prédire le champ transitoire rayonné dans un milieu élastique par les traducteurs ultrasonoresA. LHÉMERY
Ecole Centrale de Paris, Laboratoire de Mécanique, URA 850 du CNRS, Equipe Ultrasons, Grande Voie des Vignes, 92295 Châtenay-Malabry cedex, France
A model is proposed for the transient radiation by an arbitrary loading in an elastic half-space. The assumptions and approximations made in the derivation are explicitely presented. Their consequences on model's accuracy are discussed. A radiation integral for elastic waves is derived and shown to be related to the Rayleigh integral for acoustic waves. As an example, analytic expression for the field radiated by a disc thickness-mode transducer is given, leading to a solution to displacement impulse-responses closely related to the well-known solution to transient acoustic radiation. Results predicted by the present model are compared with exact results. The accuracy is very satisfactory both qualitatively (shape of waveforms) and quantitatively (amplitude).
© EDP Sciences 1994