摘要
本文基于不变性测试方程法( M E I) 提出一种快速算法( Fast M E I) ,在二维散射体表面建立共形差分网格后,通过对节点的重新排序,将原问题中的稀疏矩阵变换为带状稀疏阵,从而使占用的计算机内存和计算时间均由 O( N2) 下降为 O( N) ,可以解决原来无法计算的问题.文中成功地计算了最大周长为10000 个波长的几个电大尺寸二维柱体的电磁散射,并与矩量法、 M E I方法进行了比较.
This paper presents a fast algorithm based on the measured equation of invariance (Fast MEI).Conformal meshes are made along the surface of two dimensional scatterer.Renumbering of nodes changed the original sparse matrix into band one,and the consumption of computer memory and CPU time decrease from O(N 2) to O(N) .Via this new algorithm,electrically large problem can now be rapidly solved.The scattering fields are computed on several 2 D cylinders with the maximum perimeter of 10,000 wave length.The results are then compared with that got by MOM and MEI.
出处
《电子学报》
EI
CAS
CSCD
北大核心
1999年第9期124-126,共3页
Acta Electronica Sinica
基金
国家杰出青年基金
关键词
有限差分方程
柱体散射
电磁散射
MEI
Measured equation of invariance,Finite difference equation,Cylinder scattering,Band matrix,Sparse matrix