摘要
摘要
随着汽车电子技术的发展日渐成熟，汽车的电磁兼容性能成为汽车出厂前必须解决的问题。在电动汽车和混合动力汽车中，因为高压动力电缆其高电压高震荡的工作条件，其被视为汽车电力电子系统产生的干扰辐射的一个重要零件，所以对高压线缆的研究就显得十分重要。本文以高压屏蔽线缆为研究对象，并选取四个样本，分别通过转移阻抗解析计算模型建模计算、对线缆电磁建模仿真与分析，得到各个样本屏蔽效能大小。进一步仿真其在整车的上布置位置与线缆长度对整车的影响。具体研究内容归纳如下：
1、研究了先进的转移阻抗计算模型，并对各个模型进行分析并用Matlab进行编程，通过文献结果对比验证了不同模型对于大尺寸的高压屏蔽线缆的适用性。
2、研究了常用的测试屏蔽线缆转移阻抗的试验方法，采用精度高且布置简单的三同轴法对高压屏蔽线缆进行转移阻抗测试，并与前文的计算结果进行数据对比，再次验证了计算模型的有效性，也间接说明了各样本线缆的屏蔽效能大小。
3、利用FEKO对试验线缆和文献中的线缆进行电磁模型建模，采用多导体传输线法对各样本分别进行平面波照射条件下和单极子天线照射条件下的抗扰度频域仿真，获得各样本的屏蔽效能大小。
4、利用FEKO对试验线缆进行电磁辐射发射仿真，参考GB/T18655-2010建立测试仿真环境，验证模型建立的正确性，对各个样本进行电磁辐射发射仿真，获得各样本的屏蔽效能与辐射发射电场值大小的关系。
汽车辐射5、对汽车整车电磁仿真模型进行建模，并分析了建模方法对整车的电磁环境的预测作用；同时研究了在整车中仿真不同线缆布线方式、线缆长度对整车电磁环境的影响。
综上所述，本文采用多种方法，从多个角度对高压屏蔽线缆的屏蔽效能进行评价，并且讨论了各方法的有效性。同时考虑高压屏蔽线缆在整车上的布置位置对驾驶舱以及整车电磁环境所带来的影响，优化整车电磁环境，减少生产成本，为汽车企业在预选用高压线缆时提供参考。
关键词：汽车线缆，屏蔽线缆，转移阻抗，建模，辐射
Abstract
Abstract
With the development and maturity of automotive electronic technology,the electromagnetic compatibility of automobiles has become a problem that must be solved before they leave the factory.In electric vehicles and hybrid electric vehicles,the high-voltage power cable is regarded as a
n important part of the interference radiation generated by the automotive power electronic system because of its high voltage and high vibration working conditions.In this paper,the high-voltage shielded cable is taken as the research object,and four samples are selected.The shielding efficiency of each sample is obtained through the analytical calculation model modeling of transfer impedance,the electromagnetic modeling simulation and analysis of the cable.Further simulation of its layout position on the vehicle and cable length on the vehicle.Specific research contents are summarized as follows:
1.Advanced transfer impedance calculation model was studied,and each model was analyzed and programmed by Matlab.The applicability of different models for large-size high-voltage shielded cables was verified by comparing the results of literature.
2,research the common test for the shield wire transfer impedance test method,the high precision and three coaxial arrangement of simple method is adopted for high voltage wire transfer impedance test,and compared with calculation result of above data,again to verify the validity of the calculation model,also indirectly shows the sample size of cable shielding effectiveness.
3.FEKO was used to conduct electromagnetic model modeling of test cables and cables in literature,
and multi-conductor transmission line method was used to conduct frequency domain simulation of disturbance immunity under plane wave irradiation and monopole antenna irradiation for each sample,so as to obtain shielding effectiveness of each sample.
4.FEKO was used to conduct electromagnetic radiation emission simulation on the test cables,and the test simulation environment was established with reference to GB/ t18655-2010to verify the correctness of the model establishment.The electromagnetic radiation emission simulation was conducted on each sample to obtain the relationship between the shielding efficiency of each sample and the value of the radiation emission electric field.