電磁脈沖對(duì)線纜的耦合仿真研究
發(fā)布時(shí)間：2019-02-16 22:38
【摘要】：系統(tǒng)互連線纜的廣泛存在,會(huì)產(chǎn)生電磁場(chǎng)到線纜的耦合問題。一旦線纜遭到電磁脈沖輻照,電磁能量通過線纜進(jìn)入系統(tǒng),會(huì)對(duì)敏感的電子器件造成毀傷。因此敏感的電子系統(tǒng)需要電磁加固才能保證即使受到脈沖干擾仍能正常工作。電磁加固設(shè)計(jì)必須要以耦合量及耦合規(guī)律作為依據(jù)。本文以電磁場(chǎng)理論、傳輸線方程為理論基礎(chǔ),細(xì)致地討論了單線回路、多線回路及屏蔽線纜的建模與計(jì)算問題,給出了不同算例,為工程中電磁加固設(shè)計(jì)提供參考。本文研究電磁脈沖對(duì)線纜的耦合仿真,所取得的主要成果為:1.本文根據(jù)單線回路的傳輸線方程分別研究了線纜長(zhǎng)度、高度、入射角及線徑對(duì)耦合量的影響。對(duì)以往的結(jié)論進(jìn)行修正后得到:其他條件不變時(shí),線纜長(zhǎng)度在0.1m~6m范圍內(nèi),耦合量隨線長(zhǎng)增加而增加;線纜高度在0.25m~8m區(qū)間時(shí),耦合電流隨高度的增大而增大。同時(shí),本文研究了高空核電磁脈沖E2、E3階段對(duì)線纜的耦合量,得到結(jié)論:對(duì)高空核電磁脈沖E1階段的防護(hù)設(shè)計(jì)就能將E2、E3階段的防護(hù)考慮在內(nèi)。2.本文提出了一種計(jì)算同軸線芯線耦合量的方法。此方法根據(jù)屏蔽層內(nèi)外回路的特點(diǎn),建立耦合方程。經(jīng)過合理簡(jiǎn)化,將內(nèi)回路的非齊次方程組轉(zhuǎn)變成常系數(shù)方程組,并逐步推導(dǎo),最終得到計(jì)算公式。依據(jù)具體同軸線參數(shù)對(duì)其計(jì)算,得到了1MHz時(shí)同軸線芯線上的耦合電流分布,并分別計(jì)算了芯線終端位置的時(shí)頻域耦合電流曲線及屏蔽層屏蔽效能。通過CST軟件仿真驗(yàn)證了方法的合理性。此方法為工程中計(jì)算同軸線芯線的耦合量提供了一種途徑。3.本文通過對(duì)USB總線的分析,抽象出廣義電路耦合模型。通過CST軟件仿真,得到了此模型在無屏蔽層和有屏蔽層時(shí)的耦合量,并得到結(jié)論:在差分線和參考地線構(gòu)成的多導(dǎo)體回路中,參考地線上的耦合電流高于差分線上電流,參考地線在防護(hù)設(shè)計(jì)時(shí)應(yīng)該重點(diǎn)考慮;線纜屏蔽層可使芯線上的耦合電流顯著降低,達(dá)到設(shè)備所能耐受或保護(hù)的量級(jí)。
[Abstract]:The widespread existence of system interconnection cable will lead to the coupling problem between electromagnetic field and cable. Once the cable is irradiated by electromagnetic pulse, the electromagnetic energy enters the system through the cable, which will damage the sensitive electronic device. Therefore, sensitive electronic systems require electromagnetic reinforcement to ensure that they work properly even when they are disturbed by pulses. Electromagnetic reinforcement design must be based on coupling quantity and coupling law. Based on the theory of electromagnetic field and transmission line equation, this paper discusses in detail the modeling and calculation of single loop, multi-wire loop and shielded cable, and gives different calculation examples, which provides a reference for the design of electromagnetic reinforcement in engineering. In this paper, the coupling simulation of electromagnetic pulse to cable is studied. The main results are as follows: 1. The effects of cable length, height, incident angle and diameter on the coupling are studied based on the transmission line equations of the single loop. After revising the previous conclusions, it is concluded that when other conditions are invariant, the cable length is in the range of 0.1m~6m, and the coupling amount increases with the increase of the wire length, and the coupling current increases with the increase of the height of the cable when the cable height is in the 0.25m~8m region. At the same time, the coupling capacity of E2E3 phase to cable is studied in this paper. It is concluded that the protection design of E2E3 stage can take the protection of E2E3 into account. 2. In this paper, a method for calculating coaxial core coupling is presented. According to the characteristics of the inner and outer circuits of the shielding layer, the coupling equation is established. After reasonable simplification, the inhomogeneous equations in the inner loop are transformed into the constant coefficient equations, and then the formulas are derived step by step. According to the specific coaxial parameters, the coupling current distribution on the coaxial core line of 1MHz is obtained, and the time-frequency coupling current curve of the core terminal position and shielding effectiveness of the shield layer are calculated respectively. The rationality of the method is verified by CST software simulation. This method provides a way to calculate the coupling quantity of coaxial core line in engineering. Based on the analysis of USB bus, the generalized circuit coupling model is abstracted in this paper. Through CST software simulation, the coupling amount of the model is obtained in the case of unshielded and shielded layers, and it is concluded that the coupling current on the reference ground wire is higher than that on the differential line in the multi-conductor loop composed of the difference wire and the reference ground wire, and the coupling current on the reference ground wire is higher than that on the differential line. The reference ground wire should be considered in the protection design. The cable shielding layer can significantly reduce the coupling current on the core wire, reaching the order of magnitude that the equipment can withstand or protect.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN811
本文編號(hào)：2424911
[Abstract]:The widespread existence of system interconnection cable will lead to the coupling problem between electromagnetic field and cable. Once the cable is irradiated by electromagnetic pulse, the electromagnetic energy enters the system through the cable, which will damage the sensitive electronic device. Therefore, sensitive electronic systems require electromagnetic reinforcement to ensure that they work properly even when they are disturbed by pulses. Electromagnetic reinforcement design must be based on coupling quantity and coupling law. Based on the theory of electromagnetic field and transmission line equation, this paper discusses in detail the modeling and calculation of single loop, multi-wire loop and shielded cable, and gives different calculation examples, which provides a reference for the design of electromagnetic reinforcement in engineering. In this paper, the coupling simulation of electromagnetic pulse to cable is studied. The main results are as follows: 1. The effects of cable length, height, incident angle and diameter on the coupling are studied based on the transmission line equations of the single loop. After revising the previous conclusions, it is concluded that when other conditions are invariant, the cable length is in the range of 0.1m~6m, and the coupling amount increases with the increase of the wire length, and the coupling current increases with the increase of the height of the cable when the cable height is in the 0.25m~8m region. At the same time, the coupling capacity of E2E3 phase to cable is studied in this paper. It is concluded that the protection design of E2E3 stage can take the protection of E2E3 into account. 2. In this paper, a method for calculating coaxial core coupling is presented. According to the characteristics of the inner and outer circuits of the shielding layer, the coupling equation is established. After reasonable simplification, the inhomogeneous equations in the inner loop are transformed into the constant coefficient equations, and then the formulas are derived step by step. According to the specific coaxial parameters, the coupling current distribution on the coaxial core line of 1MHz is obtained, and the time-frequency coupling current curve of the core terminal position and shielding effectiveness of the shield layer are calculated respectively. The rationality of the method is verified by CST software simulation. This method provides a way to calculate the coupling quantity of coaxial core line in engineering. Based on the analysis of USB bus, the generalized circuit coupling model is abstracted in this paper. Through CST software simulation, the coupling amount of the model is obtained in the case of unshielded and shielded layers, and it is concluded that the coupling current on the reference ground wire is higher than that on the differential line in the multi-conductor loop composed of the difference wire and the reference ground wire, and the coupling current on the reference ground wire is higher than that on the differential line. The reference ground wire should be considered in the protection design. The cable shielding layer can significantly reduce the coupling current on the core wire, reaching the order of magnitude that the equipment can withstand or protect.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN811
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 王一哲;王澤忠;柳華;徐迪;李云偉;;瞬態(tài)電磁場(chǎng)對(duì)屏蔽電纜的耦合機(jī)理[J];高電壓技術(shù);2009年08期
，本文編號(hào)：2424911
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