CAJ | 학술논문

针对Gedney提出的完全匹配层(PML)无法用于有耗各向同性计算域的截断及其对倏逝波的衰减不理想等问题,提出了一种扩展方法.扩展的PML的主要思想是在各向异性的PML中引入与有耗介质空间相一致的复介电常数和复磁导率,使之可以与有耗介质计算域相匹配.通过给PML的张量介电常数、张量磁导率增加衰减因子以加速倏逝波的衰减.构造了PML吸收效果验证模型,数值结果证明了扩展的PML在处理有耗介质计算域截断问题中的有效性.利用该吸收边界条件,采用时域有限差分法计算了电磁脉冲作用下地面铺设电缆的电磁脉冲响应,计算结果和试验结果取得了较好的一致.
침대Gedney제출적완전필배층(PML)무법용우유모각향동성계산역적절단급기대숙서파적쇠감불이상등문제,제출료일충확전방법.확전적PML적주요사상시재각향이성적PML중인입여유모개질공간상일치적복개전상수화복자도솔,사지가이여유모개질계산역상필배.통과급PML적장량개전상수、장량자도솔증가쇠감인자이가속숙서파적쇠감.구조료PML흡수효과험증모형,수치결과증명료확전적PML재처리유모개질계산역절단문제중적유효성.이용해흡수변계조건,채용시역유한차분법계산료전자맥충작용하지면포설전람적전자맥충향응,계산결과화시험결과취득료교호적일치.
Extensional method was presented for the origin of Gedney perfectly matched layer(PML) absorbing boundary condition could not be used in truncation of lossy media and was not effective in absorbing evanescent waves. The main idea of extensional PML was to overcome the limitation of Gedney PML by deriving complex permittivity and complex permeability from lossy media to PML. Evanescent coefficient was put forward also to accelerate evanescent wave fading down. The computational model was designed to study the reflection of PML to lossy media. The numerical results prove that the extensional method is very efficient in terminating computational domain composed of lossy media. The extensional PML was used in FDTD method to simulate the EMP effect of a ground laying shielded cable. Compared with experimental data, the numerical results have proved to be reliable.