ASA 124th Meeting New Orleans 1992 October

5aSA9. Time domain analysis of internally loaded cylindrical shells at axial incidence.

Matthew Conti

Ira Dyer

Dept. of Ocean Eng., MIT, 77 Massachusetts Ave., Cambridge, MA 02139

Internal structures can significantly modify the scattered field of an elastic shell. The influence of such internal structures within a cylindrical shell are shown to change the backscattered time-domain signal at or near axial incidence. To further elucidate this influence, bistatic measurements have been performed on two cylindrical shell models: an empty shell and a duplicate shell with unequally spaced ribs with resiliently mounted wave-bearing structures. A line source provided wideband excitation in the range 2.5