ASA 126th Meeting Denver 1993 October 4-8

1pUW12. The impulse response of rough two-dimensional surfaces.

Richard S. Keiffer

NRL-SSC, Code 7181, Stennis Space Center, MS 39529-5004

J. C. Novarini

PSI, Long Beach, MS 39560

Previously, a model for the impulse response of rough two-dimensional (2-D) surfaces, based on an extension of the wedge assemblage method, has been described (R. S. Keiffer et al., Proceedings of the Second IMACS Symposium on Computational Acoustics, Vol. 1, p. 67), In the time that has elapsed since this fully 3-D scattering model's original development, the validity of the WA model, which was questionable for smooth, unwedge-like surfaces has clearly been established for 2-D surfaces [R. S. Keiffer, J. Acoust. Soc. Am. (to be published)]. More recently, the extension of the WA method that allows for the application of the technique to fully 2-D surfaces has been rigorously tested in a numerical study involving scattering from thin disks (R. S. Keiffer et al., submitted to J. Acoust. Soc. Am.). With the validity of the WA method less in question, and with the increasing availability of benchmark quality solutions (albeit in the frequency domain) for the fully 3-D problem, it seems appropriate at this time to review the 3-D wedge assemblage scattering program (WASP 3D) and to begin a benchmarking exercise. [This work has been supported by ONR.]