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三维粗糙面散射中IRBC的FFT加速算法

DOI: 10.13190/jbupt.200901.77.liup, PP. 77-80

Keywords: 迭代Robin边界条件,快速傅里叶变换,有限元法

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Abstract:

对于粗糙表面等以平面结构为主体的散射问题,迭代Robin边界条件(IRBC)残值计算最耗时的部分是结构上方大范围的平面虚拟边界。为减少运算量,加快计算速度,将IRBC的积分方程转化为二维卷积形式,导出快速傅立叶变换加速计算的公式。通过有限元法数值模拟三维随机粗糙表面的电磁散射,验证了方法的精度与效率。

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