Circumferential waves on an immersed, fluid-filled elastic cylindrical shell

The existence of various types of circumferential waves, both predominantly shell or fluid borne, and the repulsion of their dispersion curves is disc ussed here for an infinite, thin elastic, circular-cylindrical shell immers ed in a fluid and filled with another fluid. The study is based on an analy tic calculation of the partial-wave resonances in the acoustic scattering a mplitude of a normally incident plane wave. A large number of cases of repu lsion are found in the phase-velocity dispersion curves of the various type s of circumferential waves due to the shell-fluid coupling. (C) 1999 Acoust ical Society of America. [S0001-4966(99)02003-2].