【作者】 白保东；

【导师】 谢德馨；

【作者基本信息】 沈阳工业大学 ， 电机与电器， 2006， 博士

【摘要】 电磁兼容暗室是电磁兼容性研究的关键设备,采用计算机分析、预测并设计其性能是当前电磁兼容性研究领域的热点问题。而且,构建准确的电磁兼容暗室的计算机模型也是开展电磁兼容虚拟研究与设计的基础,具有重要的工程应用价值。本文针对电磁兼容暗室时域分析及设计中的关键问题开展研究。主要工作及解决的问题是: 1.考虑吸波体制造工艺中材料电导率的存在及影响,构建了有耗材料棱锥型吸波体时域分析模型。采用有限差分法格式模拟及分析了不同设计参数下吸波体阵列对电磁波的吸收作用。 2.针对吸波材料特殊的色散特性,基于数字处理技术给出了一个新的考虑介电常数色散特性、导磁率色散特性及电导率的多参数三维时域有限差分法格式、边界条件和算法,从而能够在不同入射波条件下更准确地模拟色散特性吸波材料中的电磁场。 3.针对电磁兼容暗室性能难以模拟这样的电大问题,利用小波尺度函数,给出了一个新的考虑材料有耗参数及色散特性多分辨率时域分析算法,并在此基础上实现了对暗室性能的有效分析与预测。 4.建立了考虑吸波材料有耗特性、色散特性的电磁兼容暗室计算机仿真模型。在此基础上对暗室归一化场地衰减等性能进行了分析研究。验证了本文提出的改进型MRTD方法。 本文针对电磁兼容暗室的设计与分析,提出了系统的复杂材料时域分析算法。对吸波体电磁波作用机理开展了比较深入的研究。提出了解决色散材料模拟、电大问题计算、暗室性能分析等问题的方法,对电磁兼容暗室设计以及电子、电气产品虚拟电磁兼容性研究提供了有效的分析理论与工具。更多还原

【Abstract】 Electromagnetic compatibility (EMC) anechoic chambers are key equipments in the EMC research. The characteristicanalysis,prediction and design of EMC chamber by computer simulation are in the highlight at nowdays research works in EMC field. Furthermore, a proper computational model of EMC chamber could provide the foundation of the EMC virtual design and research of electric products. This dissertation investigates the time-domain characteristics and key design problems of EMC chambers. The main works are as follows:1. The lossy pyramid absorber models for time domain analysis are constructed including the affection of electric conductivities which is technically produced in the absorber manufacture. By the use of a Finite Difference Time Domain (FDTD) algorithm, the effects of the absorber arrays with different design parameters on electromagnetic wave are simulated and analyzed.2. For the dispersive properties of absorbers, an new 3D-FDTD formulation, boundary condition and algorithm are presented under considering dispersive permittivity, dispersive magnetic permeability and electric conductivity based on digital processing technique.Therefore, the electromagnetic fields in absorbers with dispersive property can be more accurately investigated under different incident waves.3. In order to give a solution to the electric problems with electrically large scale, such as the simulation to large anechoic chamber, an new Multiresolution Time Domain scheme (MDTD) is presented under considering the lossy and dispersive properties of materials by a wavelet scale function. With the scheme, the characteristics of anechoic chamber have been analyzed and predicted.4. The numerical simulation models of chambers are well constructed. The chamber models include absorbers which have lossy and dispersive properties. Based on the models, Normalized Site Attenuation (NSA) and pure region measurement are analyzed to verify the modified MRTD method proposed in the dissertation.For designing and analizing of the EMC chambers, this dissertation presents a systemic time domain analysis methods for complicated material properties. The operating mechanism ofelectromagnetic waves in absorbers is investigated in depth. The solutions to the material modeling problem for both dispersive permittivity and dispersive magnetic permeability, the large electric problem and the characteristics analysis for chambers with dispersive absorbers are given. It provides an effective analyzing theory and tool for the EMC chamber design and the virtual EMC measurement of electronic and electric products in engineering.更多还原