Abstract
Theoretical and experimental studies are presented of the radiation field of an immersed hollow cylinder driven by a harmonic point force on its inner surface. The exact theory of elasticity and the approximate thin shell theory are used to analyze the behavior of the thin shell. Due to the differences in the basic assumptions which underlie these two theories, their dispersion curves show that they agree at low ka values only. Also, the approximate theory does not include the torsional vibrational mode. The analytic computations of the radiation field are performed to illustrate the difference in both the low and high ka values. The theoretical model was duplicated experimentally by using a mechanical point source excited by a piezoelectric material to drive a thin cylindrical shell of finite length (length ≪ radius) immersed in water. Measurements of the radiated field were taken at near and farfields at ka values between 1 and 5. These results are compared to both the exact and approximate theories.
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