J. Phys. IV France 02 (1992) C1-717-C1-720
ÉTUDE ANALYTIQUE D'UN FAISCEAU ACOUSTIQUE BORNÉ EN RÉGIME IMPULSIONNELM. ROUSSEAU1 and Ph. GATIGNOL2
1 Université Paris VI, Laboratoire de Modélisation en Mécanique associé au CNRS URA 229, Tour 66, 4 place Jussieu, F-75252 Paris cedex 05, France
2 Université de Technologie de Compiègne, Groupe DAVI, BP. 649, F-60206 Compiègne, France
In this paper, we propose an analytical study of the acoustical beam produced by a source of finite size, emitting, in a two-dimensional fluid medium, an arbitrary signal, with oblique incidence. The pressure field, given by a LAPLACE - FOURIER transform, can be written, by means of the CAGNIARD - DE HOOP method, as a single convolution showing that the spatial and temporal effects are uncoupled. The solution so obtained depends on the incidence of the beam, with the introduction of a time delay. The spatial component of the reponse depends on the normal velocity data on the plane source - two different distributions are then considered.
© EDP Sciences 1992