ASA 126th Meeting Denver 1993 October 4-8

4pSA11. Effects of internal attachment on sound scattering from cylindrical shells.

Y. P. Guo

Dept. of Ocean Eng., Rm. 5-204, MIT, Cambridge, MA 02139

This paper discusses the effects of attachment conditions of internal structural loading on sound scattering from cylindrical shells. The internal loading is modeled as circular elastic plates. It will be shown that strongest scattering results from attachment that constrains tangential motions in the shell, because this kind of attachment interacts with compressional and shear waves most strongly, which are dominant waves contributing to the scattered field and are essentially associated with tangential motions in the shell. This is in sharp contrast to sound scattering from structural joints in plane geometries, a flat plate, for example, where the scattered field is dominated by constraints that restrict motions normal to the plate. This suggests that sliding joints in shell like structures should be acoustically beneficial.