ASA 126th Meeting Denver 1993 October 4-8

4aEA6. Three-dimensional modeling of low-frequency active source arrays.

Donald L. Cox Robert T. Chapman

Naval Undersea Warfare Ctr., Div. Newport, Detachment New London, Code 423, New London, CT 06320

A three-dimensional analysis of two closely spaced class IV flextensional transducers is presented. The analysis was performed using a finite-element program, nomad, developed to solve extremely large three-dimensional problems. The program nomad (NO Matrix Decomposition) uses the conjugate gradient iterative solution technique with element by element (EBE) storage and preconditioning and enhanced Cray vector processing. In order to demonstrate the modeling capabilities of the code, no symmetry downsizing of the two transducer model was invoked. Stress and flux density information are provided for the transducer response. For the acoustic media, both pressure and intensity information is presented. [Work supported by the NUWC IR/IED program.]