Abstract
The design and modeling of an electroacoustic toroidal-hollow-shell transducer for underwater acoustics is considered. Radiation from a solid toroid was considered by Sherman and Parke (JASA 38, 1965) and is useful as an approximation for the radiation of a short cylinder. This thesis explores the vibration of a hollow toroid vibrating in circumferential hoopmode and in breathing tube-mode and presents the governing equations for its resonance frequency and equivalent electromechanical parameters. Results are compared with a first prototype made from piezoelectric ceramics composed of piecewise cylindrical tube sections.