Acoustic scattering by few close shells: comparison between experience and theory

Resonances for close shells are studied. This work is a comparison between experimental data and numerical results of a previous paper (P.Y. Le Bas et al, J. Acoustic Soc. Am., no.115(4), p.1460-1467, 2004). For shells close enough, a split of A-waves resonances of one shell is shown. For N aligned shells, N resonances are shown in eclipse configuration. For other incidence angles, each of them seems to split again. For shells at the apexes of a triangle, an extra resonance appears.