A NUMERICAL METHOD FOR SCATTERING FROM ACOUSTICALLY SOFT AND HARD THIN BODIES IN TWO DIMENSIONS
✍ Scribed by S.A. YANG
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 285 KB
- Volume
- 250
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
This paper presents a numerical method for predicting the acoustic scattering from two-dimensional (2-D) thin bodies. Both the Dirichlet and Neumann problems are considered. Applying the thin-body formulation leads to the boundary integral equations involving weakly singular and hypersingular kernels. Completely regularizing these kinds of singular kernels is thus the main concern of this paper. The basic subtraction}addition technique is adopted. The purpose of incorporating a parametric representation of the boundary surface with the integral equations is two-fold. The "rst is to facilitate the numerical implementation for arbitrarily shaped bodies. The second one is to facilitate the expansion of the unknown function into a series of Chebyshev polynomials. Some of the resultant integrals are evaluated by using the Gauss}Chebyshev integration rules after moving the series coe$cients to the outside of the integral sign; others are evaluated exactly, including the modi"ed hypersingular integral. The numerical implementation basically includes only two parts, one for evaluating the ordinary integrals and the other for solving a system of algebraic equations. Thus, the current method is highly e$cient and accurate because these two solution procedures are easy and straightforward. Numerical calculations consist of the acoustic scattering by #at and curved plates. Comparisons with analytical solutions for #at plates are made.
2002 Elsevier Science Ltd.