基于时域有限差分网格生成改进算法的混响室简便计算方法  

Reverberation Chamber Fast Numerical Calculation Based on an Improved FDTD Mesh Generation Algorithm

作　　者：赵阳[1] 魏光辉[1] 崔耀中[1] 范丽思[1] 潘晓东[1] 万浩江[1] 

机构地区：[1]军械工程学院电磁环境效应国家级重点实验室,石家庄050003

出　　处：《高电压技术》2015年第3期1049-1056,共8页High Voltage Engineering

基　　金：国家自然科学基金(61372040)~~

摘　　要：为解决时域有限差分(FDTD)方法中零厚度平面的剖分问题,实现对有损混响室的快速简便数值计算,提出了一种基于三角面元的FDTD网格剖分改进算法,并将混响室的缝隙泄露、趋肤效应等导致的损耗等效为混响室内空间介质损耗,将混响室内搅拌器与腔体壁均等价为无厚度的理想电导体,结合FDTD网格剖分算法建立有损混响室简便模型,采用三维旋转矩阵实现搅拌器的步进。从混响室的储能和统计均匀特性着手,对仿真和实测得到的归一化场强和品质因数进行对比,并采用Kolmogorov-Smirnov(KS)检验的方法考察仿真结果、实测结果与其相应的理论值的归一化电场强度累积分布函数(CDF)曲线拟合度,检验结果均接受了原假设,且大部分P值均高于0.5,验证了所建简化混响室模型的正确性。To improve the approach of discretizing the geometries without thickness, and to simulate lossy reverberation chambers（RC） in a fast and convenient way, an improved approach based on the surface triangular patch model is presented, and losses originated from aperture leakage and skin effect are substituted by packing internal lossy media. Whereas the equivalent method, all the finite conductive materials including cavity walls and stirrers can be assigned as perfect electric conductor without thickness. Combined the FDTD mesh generation algorithm with 3-D rotating matrix, the handy model can be realized. In order to validate the lossy RC model via energy storage ability and statistical characteristics inside the cavity and to compare the normalized electric field intensity and the Q-value between simulation and experimental results, the Kolmogorov–Smirnov test is performed to analyze the CDF fitness of normalized electric field given by simulation and experiment. The numerical results which the most P-value is higher than 0.5 are well in accordance with the experimental ones.

关 键 词：混响室 时域有限差分方法 网格剖分 数值仿真 KS检验 P值 

分 类 号：TN03[电子电信—物理电子学]