Radiation Properties of Cylindrical Shells

A theoretical method, similar to that applied recently to flat panels, is developed for estimating the radiation efficiency of a cylindrical shell. The radiation efficiency of the cylinder is significantly greater than that of a flat panel of equal dimensions at and about the ring frequency where the longitudinal wavelength is equal to the circumference of the cylinder. This peak in the radiation efficiency is shown to be associated with the increase in flexural-wave speed due to curvature. A series of measurements of radiation efficiency of cylinders was conducted. The agreement between theory and experiment is satisfactory.