本文選題：屏蔽機箱 + 導電橡膠　； 參考：《西安電子科技大學》2015年碩士論文

【摘要】：機箱作為集成電子系統(tǒng)的載體,在很多工程領域已被廣泛應用。屏蔽機箱的主要作用是保證機箱內(nèi)部不同電子設備減少或免受外部的電磁干擾,保證電子設備能穩(wěn)定工作,其性能優(yōu)劣的判斷指標便是機箱的屏蔽效能�？卓p是影響機箱屏蔽效能的主要因素,除了散熱等功能性孔縫外,由于加工誤差或者裝配等問題,實際機箱裝配面處的孔縫會造成不同程度的電磁泄漏。由于其影響因素復雜、參數(shù)難以確定,因此這類孔縫是機箱電磁泄漏及屏蔽研究的難點,也是本文研究的重點。導電橡膠作為抑制屏蔽機箱蓋板間縫隙最常用也是最有效的方法,其在屏蔽機箱上的應用性能越來越受到人們的重視。本文以導電橡膠在屏蔽機箱上的電磁兼容性能為研究對象,參考閱讀大量國內(nèi)外文獻資料和導電橡膠公司的工程實用手冊,以電磁屏蔽理論為基礎,從孔縫泄漏機理出發(fā),通過研究導電橡膠的物理性能,包括力學性能、電性能以及密封性能,結合導電橡膠安裝在屏蔽機箱上的屏蔽效能測試和仿真、不同填充顆粒導電橡膠的電化學腐蝕試驗和電化學腐蝕前后的屏效仿真,最終形成導電橡膠在屏蔽機箱上的實際工程應用理論依據(jù)。主要的研究成果如下:1.對屏蔽機箱的電磁泄漏因素進行探討和總結。對影響導電橡膠在機箱上應用的物理性能進行概括和總結,給出這些物理性能參數(shù)的獲取方法或者標準測試方法,并通過測試將實際不同樣品的物理性能進行對比。2.結合實際的項目,對實際的安裝導電橡膠的機箱進行屏蔽效能測試和電磁屏蔽仿真。對測試數(shù)據(jù)和仿真數(shù)據(jù)進行對比,分析數(shù)據(jù)的正確性和吻合性。3.給出與導電橡膠配合的蓋板安裝槽設計流程以及相關計算公式;給出導電橡膠需要滿足一定壓緊力時,蓋板螺釘間距的設計流程圖和相關計算公式。4.對四種不同填充顆粒的導電橡膠配合四種不同表面處理的金屬,按照測試標準進行電化學腐蝕試驗。通過比較分析試驗前后的數(shù)據(jù)和外觀,給出四種導電橡膠和金屬防電化學腐蝕的一般性結論。
[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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN03

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本文編號：2118411