导电橡胶在屏蔽机箱上的电磁兼容应用研究

发布时间：2018-07-12 20:45

本文选题：屏蔽机箱 + 导电橡胶　；参考：《西安电子科技大学》2015年硕士论文

【摘要】：机箱作为集成电子系统的载体,在很多工程领域已被广泛应用。屏蔽机箱的主要作用是保证机箱内部不同电子设备减少或免受外部的电磁干扰,保证电子设备能稳定工作,其性能优劣的判断指标便是机箱的屏蔽效能。孔缝是影响机箱屏蔽效能的主要因素,除了散热等功能性孔缝外,由于加工误差或者装配等问题,实际机箱装配面处的孔缝会造成不同程度的电磁泄漏。由于其影响因素复杂、参数难以确定,因此这类孔缝是机箱电磁泄漏及屏蔽研究的难点,也是本文研究的重点。导电橡胶作为抑制屏蔽机箱盖板间缝隙最常用也是最有效的方法,其在屏蔽机箱上的应用性能越来越受到人们的重视。本文以导电橡胶在屏蔽机箱上的电磁兼容性能为研究对象,参考阅读大量国内外文献资料和导电橡胶公司的工程实用手册,以电磁屏蔽理论为基础,从孔缝泄漏机理出发,通过研究导电橡胶的物理性能,包括力学性能、电性能以及密封性能,结合导电橡胶安装在屏蔽机箱上的屏蔽效能测试和仿真、不同填充颗粒导电橡胶的电化学腐蚀试验和电化学腐蚀前后的屏效仿真,最终形成导电橡胶在屏蔽机箱上的实际工程应用理论依据。主要的研究成果如下:1.对屏蔽机箱的电磁泄漏因素进行探讨和总结。对影响导电橡胶在机箱上应用的物理性能进行概括和总结,给出这些物理性能参数的获取方法或者标准测试方法,并通过测试将实际不同样品的物理性能进行对比。2.结合实际的项目,对实际的安装导电橡胶的机箱进行屏蔽效能测试和电磁屏蔽仿真。对测试数据和仿真数据进行对比,分析数据的正确性和吻合性。3.给出与导电橡胶配合的盖板安装槽设计流程以及相关计算公式;给出导电橡胶需要满足一定压紧力时,盖板螺钉间距的设计流程图和相关计算公式。4.对四种不同填充颗粒的导电橡胶配合四种不同表面处理的金属,按照测试标准进行电化学腐蚀试验。通过比较分析试验前后的数据和外观,给出四种导电橡胶和金属防电化学腐蚀的一般性结论。
[Abstract]:As the carrier of integrated electronic system, chassis has been widely used in many engineering fields. The main function of shielding chassis is to ensure that the different electronic devices in the chassis can reduce or avoid the external electromagnetic interference, and that the electronic equipment can work stably. The evaluation index of its performance is the shielding efficiency of the chassis. The aperture is the main factor that affects the shielding efficiency of the chassis. Except for the functional hole seam such as heat dissipation, due to machining errors or assembly problems, the slot at the assembly surface of the actual chassis will cause electromagnetic leakage to varying degrees. Because the influence factors are complex and the parameters are difficult to determine, this kind of slot is the difficult point of the electromagnetic leakage and shielding research of the chassis, and is also the focus of the research in this paper. Conductive rubber is the most commonly used and effective method to suppress the gap between the cover plates of the shield case, and its application performance in the shield box has been paid more and more attention. In this paper, the electromagnetic compatibility of conductive rubber on the shielding chassis is studied, a large number of domestic and foreign literatures and practical engineering manuals of the conductive rubber company are read, based on the electromagnetic shielding theory, the mechanism of hole and slot leakage is considered. Through the study of the physical properties of conductive rubber, including mechanical properties, electrical properties and sealing properties, combined with the shielding effectiveness test and simulation of conductive rubber mounted on the shielding chassis, The electrochemical corrosion test of conductive rubber filled with different particles and the imitation of the screen before and after electrochemical corrosion finally formed the theoretical basis for practical engineering application of conductive rubber in shielding chassis. The main research results are as follows: 1: 1. The electromagnetic leakage factors of shielded chassis are discussed and summarized. The physical properties affecting the application of conductive rubber on the chassis are summarized and summarized. The methods of obtaining or standard testing of these physical properties parameters are given, and the physical properties of different samples are compared by testing. Combined with the actual project, the shielding effectiveness test and electromagnetic shielding simulation of the actual installation of conductive rubber chassis are carried out. Compare the test data with the simulation data, analyze the correctness and consistency of the data. The design flow chart and relevant calculation formula of cover plate mounting slot with conductive rubber are given, and the design flow chart and correlation calculation formula of cover plate screw spacing are given when conductive rubber needs to meet a certain compression force. The electrochemical corrosion tests of four kinds of conductive rubber filled with four different surface treated metals were carried out according to the test standard. By comparing and analyzing the data and appearance before and after the test, the general conclusions on electrochemical corrosion resistance of four kinds of conductive rubber and metal are given.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN03

【参考文献】