ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

2aSA8. Reciprocity relations for endcap scattering of natural waves on a fluid-loaded cylindrical shell.

P. W. Smith, Jr.

Kevin D. LePage

J. Gregory McDaniel

Bolt Beranek and Newman, Inc., 70 Fawcett St., Cambridge, MA 02138

The response field on a finite axisymmetric elastic shell is approximated by a limited set of lightly damped natural waves which are coupled to each other and to far-field sound by the scattering process at the endcaps. In this talk the constraints upon the scattering functions that are a consequence of the principle of reciprocity are obtained through analysis. Results show that the reciprocity constraints predicted for a thin shell example agree well with the observed behavior of natural wave scattering as predicted by SARA 2D finite-element methods. [Work supported by ONR.]