On the Validity of the Wedge Assemblage Method for Pressure-Release Sinusoids
Abstract
In the past, the wedge assemblage (WA) method for calculating the acoustic scattering from rough, long-crested, or corrugated surfaces has been compared with both experimental data and exact theory with good results. Nevertheless, significant questions about what physics is included in the method and its realm of validity remain unanswered. In this paper, the WA method is applied to scattering from pressure-release sinusoidal surfaces in order to further explore these topics. Comparisons with accurate benchmark calculations are carried out over a broad range of kh and k alpha (k is the acoustic wave number; h and alpha are the amplitude and wavelength of the sinusoid, respectively) indicate that the primary limitation of the WA method stems from its current failure to include multiple scattering effects. It is also shown that quite good agreement with the benchmark can be achieved by a diffraction- only WA model even when kh << 1 and 'reflection-like' scattering patterns are observed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1993
- Accession Number
- ADA271893
Entities
People
- Richard S. Keiffler
Organizations
- United States Naval Research Laboratory