汽车线束等效模型及其在电磁辐射敏感度仿真中的应用  

Equivalent Model for Automotive Cable Bundle in Electromagnetic Radiation Immunity Simulation

作　　者：汪泉弟[1] 郑亚利[1] 刘青松[1] 曾铉 俞集辉[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400040 [2]浙江省富阳市供电局,富阳311400

出　　处：《电工技术学报》2012年第7期160-168,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50877081);重庆大学"211工程"三期创新人才培养计划建设项目(S-09111)

摘　　要：线束是导致汽车设备或系统不能满足电磁兼容限值的主要原因之一,建立计算简便且能准确反映电磁特性的线束模型是汽车电磁兼容建模的要点。文中建立了用于电磁辐射敏感度计算的线束等效模型。首先提出了等效波阻抗的定义并导出了计算方法;根据原始导线终端阻抗与等效波阻抗的大小关系将其分成最多四组等效导线,从而使复杂的线束得以简化。给出了多导体传输线单位长度电容矩阵和电感矩阵的计算方法,推导了等效导线的电感矩阵和电容矩阵。验证了基于有限元方法的电磁场仿真软件HFSS计算导线感应电流的有效性。对9根导线组成的线束等效处理及其共模电流的仿真结果表明,文中的等效方法是正确的。该等效模型能有效降低线束建模的复杂度,可用于研究汽车线束高频条件下的电磁辐射敏感度问题。The cable bundle is the main reason of the automobile meeting the electromagnetic compatibility （EMC） criterion. Establishment of the conductor simulation model which can reflect the cable bundle electromagnetic characteristics accurately is the key point of modeling automotive EMC. Equivalent model of cable bundle is described in this paper to calculate the electromagnetic radiation （EMR） immunity. First, the equivalent wave impedance is defined and derived, and then all the conductors of the cable bundle are classified into four groups with respect to the wave impedance and the terminal impedance. The unit length capacitance matrix and inductance matrix of the multi-conductor transmission lines are given, and the equivalent model inductance matrix and capacitance matrix are derived. It is verified that the conductor induced current can be calculated by HFSS. The equivalent model of the nine-conductor cable bundle and the simulation results show that the equivalent model is correct. Equivalent model can effectively reduce the complexity of the model, and can be used for modeling EMR immunity of automotive cable bundle.

关 键 词：汽车 线束 等效模型 电磁辐射敏感度 多导体传输线 共模电流 

分 类 号：U463.62[机械工程—车辆工程] TM154[交通运输工程—载运工具运用工程]