Bonomo Anthony L, Isakson Marcia J, Chotiros Nicholas P
Applied Research Laboratories, The University of Texas at Austin, 10000 Burnet Road, Austin, Texas 78713-8029
J Acoust Soc Am. 2015 Apr;137(4):EL235-40. doi: 10.1121/1.4914947.
The finite element method is used to model acoustic scattering from rough poroelastic surfaces. Both monostatic and bistatic scattering strengths are calculated and compared with three analytic models: Perturbation theory, the Kirchhoff approximation, and the small-slope approximation. It is found that the small-slope approximation is in very close agreement with the finite element results for all cases studied and that perturbation theory and the Kirchhoff approximation can be considered valid in those instances where their predictions match those given by the small-slope approximation.
有限元方法用于对粗糙多孔弹性表面的声散射进行建模。计算了单基地和双基地散射强度，并与三种解析模型进行了比较：微扰理论、基尔霍夫近似和小斜率近似。结果发现，在所研究的所有情况下，小斜率近似与有限元结果非常吻合，并且在微扰理论和基尔霍夫近似的预测与小斜率近似给出的预测相匹配的情况下，可以认为它们是有效的。
