This paper presents the results of a study to determine time harmonic response for the far field scattered pressure from an elastic cylindrical shell of finite length with hemispherical end closures containing internal masses subjected to an incident plane wave. A physical interpretation of the results is given in terms of the coupling of the N=0 torsional modes with modes from higher circumferential harmonics. Criteria are developed for selecting the in vacuo structural modes which constitute the impedance of the shell for acoustic scattering problems for empty shells as well as for shells containing internal structures. The ability to select the modes that comprise the impedance of the shell can be a useful tool for relating the motion of the shell to pressure in the exterior acoustic fluid.
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