Propagation axiale d'ondes dans une cible cylindrique creuse

Abstract
Acoustic scattering from an isotropic elastic hollow cylindrical shell of infinite length excited by an obliquely incident plane acoustic wave is investigated. Firstly, a Method of Isolation and Identification of Resonances called MIIR in "propagation" enables us to observe the propagation of waves (in a direction parallel to the cylinder axis) like the guided waves p=2 and p=1. An isolation and an identification are possible in an important range of incidence, contrary to a configuration of two transducers according to Snell-Descartes' law. Secondly, the nature of these waves is analysed with the axial displacement. The choice of this displacemement is confirmed by the angular diagram of the pressure radiated by the circular section, at the end of the tube.