Abstract
The two-dimensional scattering of plane waves by a thin, semi-infinite plate with either Neumann boundary conditions over both surfaces or mixed Neumann/Dirichlet conditions on opposing sides may be readily calculated. Since wave components in any plane parallel to the barrier edge undergo specular reflection, the two-dimensional formulation may be easily extended to three dimensions. The distribution of the total pressure amplitude and phase on both sides of the barrier as a function of aspect angles is shown in this paper for both types of boundary conditions. The effects of edge diffraction on acoustic array performance is demonstrated first in the calculated receiving patterns of a summed five wavelength array steered towards the baffle edge and then away from it, and second in the calculated beam patterns of a two element, two and one-half wavelength array used for phase detection. The estimated bearing error versus bearing for the null array is shown for different tilt angles and different distances of hydrophones from the baffle edge.
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