ASA 125th Meeting Ottawa 1993 May

5aSA5. Ray approach for analyzing wave scattering by a submerged vessel with internal structures.

I-Tai Lu

Yuqi Yao

Weber Res. Inst., Dept. of Electr. Eng., Polytech. Univ., Rte. 110, Farmingdale, NY 11735

This paper discusses a ray approach to analyze wave scattering by fluid-loaded targets (submarinelike structures). The approach consists of the following four elements: (1) modal analysis in separable structures (e.g., flat plate, cylindrical shell, spherical shell, etc.); (2) coupling of plate and shell modes at joints; (3) ray asymptotics and spectral approaches for separable structures; and (4) combination of the results in (2) and (3) for nonseparable structures. The model consisting of a cylindrical pipe with hemispherical endcaps, a bulk head and an internal rib, have been considered. Some computed results are compared with experimental data derived by a tank test at the NUSC facility using Mark 0 model. [Work supported by ONR.]