### ASA 127th Meeting M.I.T. 1994 June 6-10

## 2pSA7. Mid-frequency endcap reflection and radiation coefficient
extraction from FEM data.

**P. W. Smith, Jr.
**

**
Kevin D. LePage
**

**
J. Gregory McDaniel
**

**
Gregory L. Duckworth
**

**
Robert J. Barile
**

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

*
*
The response of a simple cylindrical shell terminated by rigid endcaps to
various axisymmetric mechanical excitations is determined using the SARA 2-D
finite element code. By assuming that the response of the shell is primarily
composed of structural waves, which satisfy the fluid-loaded shell equations,
the structural wave reflection matrix of the endcap is determined through an
over-constrained system of equations. Results for the frequency range, 2