非线性虚拟媒质法与其在地下通信电缆电磁屏蔽计算中的应用

针对媒质局部不均匀并且其参数呈非线性的场域求解问题 ,本文建立了非线性虚拟媒质法 ,同时应用该方法进行了地下通信电缆电磁屏蔽特性的分析计算。非线性虚拟媒质法将非线性不均匀媒质的场域求解问题转化为线性均匀媒质场域求解问题和非线性虚拟媒质场域求解问题。由于迭代过程仅限于非线性虚拟媒质区域 ,所以该算法具有计算机容量需求少和迭代收敛迅速的显著优点。

Nonlinear Fictitious Medium Method and Its Application in Electromagnetic Shielding Calculation for Underground Telecommunication Cables

A nonlinear fictitious medium method is presented,which takes locally non uniform nonlinear medium characters into account The pertinent electromagnetic shielding analysis of underground telecommunication cables is carried out by means of this numerical algorithm By using the nonlinear fictitious medium method,a region with non uniform nonlinear medium parameters can be changed into the superposition of two equivalent regions,one of which is the region with uniform linear medium parameters,another of which is the region with nonlinear fictitious medium parameters An iterative procedure is merely confined to the nonlinear fictitious medium region,so the prominent advantages of this method are requiring much less computer memories and the convergence velocity of iterative procedure is rather rapid