本文選題：編織電纜 + 傳輸線方程　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：隨著半導(dǎo)體技術(shù)的不斷進(jìn)步,電子系統(tǒng)朝著模塊化、高功率、高集成、小型化等的趨勢發(fā)展,電子系統(tǒng)的電磁兼容性問題日益突出。同時(shí),人為有意和電子設(shè)備無意地向空間中輻射電磁波等行為,使得空間電磁環(huán)境日趨復(fù)雜,其對電子系統(tǒng)的影響不可忽視。特別是其中的強(qiáng)電磁脈沖部分,這種具有高功率、寬頻帶的電磁波,對電子系統(tǒng)有嚴(yán)重的破壞作用。電纜作為電子系統(tǒng)間的信息傳輸和供電傳輸?shù)妮d體,電纜大部分暴露各種復(fù)雜電磁環(huán)境下,容易受強(qiáng)電磁脈沖干擾。電纜耦合的電磁干擾經(jīng)由電纜耦合進(jìn)系統(tǒng),可輕易損毀電子系統(tǒng)。因此,屏蔽電纜的耦合機(jī)理分析、預(yù)測和防護(hù),對提高電子系統(tǒng)的可靠性具有重要意義和工程實(shí)用價(jià)值,并且能夠?yàn)樵O(shè)計(jì)電子系統(tǒng)提供指導(dǎo)。首先,研究了應(yīng)用于屏蔽電纜電磁耦合分析的時(shí)域混合算法。以近地面上架空的屏蔽電纜作為研究對象,采用時(shí)域有限差分(FDTD)方法、傳輸線方程(TL)和電纜激勵(lì)場快速計(jì)算方法,并結(jié)合逆卷積技術(shù),研究了高效的時(shí)域混合算法,能夠用于屏蔽電纜電磁耦合的快速模擬。將算法結(jié)果與文獻(xiàn)結(jié)果進(jìn)行對比,驗(yàn)證了算法的正確性和有效性。然后,利用該混合算法分析了電纜屏蔽層不同端接負(fù)載、不同電纜架設(shè)高度和不同電磁波入射角度對芯線響應(yīng)的影響。其次,考慮了編織電纜的轉(zhuǎn)移阻抗模型的誤差對耦合分析仿真影響,介紹了相關(guān)轉(zhuǎn)移阻抗的計(jì)算模型。基于現(xiàn)有的編織電纜的轉(zhuǎn)移阻抗計(jì)算模型,提出通過電纜編織層覆蓋率K對計(jì)算模型中的編織角α與屏蔽層直徑Dm參數(shù)進(jìn)行優(yōu)化。根據(jù)自行設(shè)計(jì)的三同軸轉(zhuǎn)移阻抗測量裝置對電纜的轉(zhuǎn)移阻抗進(jìn)行實(shí)測,來驗(yàn)證本文優(yōu)化后的電纜轉(zhuǎn)移阻抗模型的有效性。在此基礎(chǔ)上,進(jìn)一步分析了編織層不同結(jié)構(gòu)參數(shù)對電纜轉(zhuǎn)移阻抗的影響。最后,將改進(jìn)之后的轉(zhuǎn)移阻抗計(jì)算模型引入到時(shí)域混合算法進(jìn)行優(yōu)化,進(jìn)而提高了算法的計(jì)算精度。最后,針對核電磁脈沖對屏蔽電纜的電磁耦合進(jìn)行濾波防護(hù)分析。首先是建立屏蔽電纜的電磁耦合模型,芯線兩端均接匹配負(fù)載。然后,采用上述研究的時(shí)域混合算法計(jì)算得到芯線上的電壓和電流響應(yīng),從而獲得響應(yīng)的幅值、頻率等關(guān)鍵參數(shù)。在此基礎(chǔ)上,以此電壓和電流響應(yīng)作為干擾源,結(jié)合電路仿真軟件,針對不同類型的干擾源,設(shè)計(jì)相應(yīng)的濾波器,然后仿真分析濾波器的防護(hù)效果,進(jìn)而實(shí)現(xiàn)了對屏蔽電纜的濾波防護(hù)設(shè)計(jì)。
[Abstract]:With the development of semiconductor technology and the trend of modularization, high power, high integration and miniaturization of electronic system, the electromagnetic compatibility of electronic system is becoming more and more serious. At the same time, the electromagnetic environment in space is becoming more and more complex due to the intentional and unintentional radiation of electromagnetic waves into space by human beings and electronic devices, and its influence on electronic systems cannot be ignored. Especially the strong electromagnetic pulse, which has high power and wide band electromagnetic wave, has a serious damage to the electronic system. As the carrier of information transmission and power supply transmission between electronic systems, most cables are exposed to various complex electromagnetic environments and are vulnerable to strong electromagnetic pulse interference. Cable-coupled electromagnetic interference can easily damage the electronic system by coupling the cable into the system. Therefore, the analysis, prediction and protection of the coupling mechanism of shielded cables are of great significance and practical value in improving the reliability of electronic systems, and can provide guidance for the design of electronic systems. Firstly, the hybrid time domain algorithm for electromagnetic coupling analysis of shielded cables is studied. Taking the overhead shielded cable near the ground as the research object, using the FDTD method, the transmission line equation (TL) and the fast calculation method of the cable excitation field, and combining with the deconvolution technique, an efficient time-domain hybrid algorithm is studied. It can be used for fast simulation of electromagnetic coupling of shielded cables. The correctness and validity of the algorithm are verified by comparing the results of the algorithm with those of the literature. Then, the effects of different terminal loads, different cable mounting heights and different incident angles of electromagnetic wave on the core line response are analyzed by using the hybrid algorithm. Secondly, the influence of the error of the transfer impedance model of the woven cable on the coupling analysis simulation is considered, and the calculation model of the correlation transfer impedance is introduced. Based on the existing transfer impedance calculation model of braided cable, the braiding angle 偽 and the diameter of shield layer D _ m in the calculation model are optimized by the cable braided layer coverage K. In order to verify the validity of the optimized cable transfer impedance model, the transmission impedance of the cable is measured according to the three-axis transfer impedance measurement device designed by ourselves. On this basis, the influence of different structure parameters of braided layer on cable transfer impedance is further analyzed. Finally, the improved transfer impedance calculation model is introduced to the time domain hybrid algorithm for optimization, thus improving the accuracy of the algorithm. Finally, the electromagnetic coupling of shielded cable is analyzed by filter protection against nuclear electromagnetic pulse. First, the electromagnetic coupling model of shielded cable is established, and the core wire is connected with matching load at both ends. Then, the voltage and current responses on the core line are calculated by using the time-domain hybrid algorithm, and the key parameters such as the amplitude and frequency of the response are obtained. On this basis, the voltage and current response as interference source, combined with circuit simulation software, for different types of interference sources, the design of the corresponding filter, and then simulation analysis of the protective effect of the filter, Furthermore, the filter protection design of shielded cable is realized.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN03

【參考文獻(xiàn)】

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本文編號：1899154