多扇区抛物方程法计算非正则形状不可穿透目标的声散射
Multisector parabolic-equation approach to compute acoustic scattering by noncanonically shaped impenetrable objects
摘要：
抛物方程方法的一个鲜为人知但功能强大的应用是目标散射问题。在本文中，我们使用noncanonically形状的对象，建立传统方法的适用性的限制，并引入广角和多重散射的方法，让凹散射体的准确治疗。PE计算的基准对有限元结果，在传统的方法中获得良好的协议，并为凹散射体与我们的修改后的方法。我们表明，基于PE的方法是显着更高的计算效率比有限元方法在更高的频率，其中对象是几个或更多的波长长。
英文摘要：
A lesser-known but powerful application of parabolic equation methods is to the target scattering problem. In this paper, we use noncanonically shaped objects to establish the limits of applicability of the traditional approach, and introduce wide-angle and multiple-scattering approaches to allow accurate treatment of concave scatterers. The PE calculations are benchmarked against finite-element results, with good agreement obtained for convex scatterers in the traditional approach, and for concave scatterers with our modified approach. We demonstrate that the PE-based method is significantly more computationally efficient than the finite-element method at higher frequencies where objects are several or more wavelengths long.
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