【摘要】：隨著科技的飛速發(fā)展,電磁干擾源的不斷增多,空間電磁環(huán)境變得越來越復(fù)雜。通常,屏蔽電纜作為設(shè)備間傳輸信號(hào)的載體,經(jīng)常受到空間電磁干擾的影響。因此,研究屏蔽電纜場線耦合問題具有非常重要的意義。本文在研究時(shí)域有限差分法和多導(dǎo)體傳輸線理論的基礎(chǔ)上,將屏蔽電纜場線耦合問題劃分為內(nèi)系統(tǒng)和外系統(tǒng)模型,通過Matlab編程計(jì)算,分析了不同因素對屏蔽電纜芯線響應(yīng)的影響。首先,本文研究了時(shí)域有限差分法的理論,通過時(shí)域有限差分法的計(jì)算區(qū)域的劃分、Maxwell基本方程的離散迭代、數(shù)值穩(wěn)定性的條件、邊界條件的設(shè)置、激勵(lì)源的選取等方面介紹了外系統(tǒng)建模時(shí)應(yīng)注意的問題。計(jì)算分析了屏蔽層接地方式不同和土壤電導(dǎo)率的不同對屏蔽層耦合響應(yīng)的影響。隨后,介紹了屏蔽電纜相關(guān)參數(shù)的計(jì)算和多導(dǎo)體傳輸線的基本理論。對內(nèi)系統(tǒng)運(yùn)用傳輸線模型進(jìn)行分析,通過對屏蔽電纜相關(guān)參數(shù)的計(jì)算,傳輸線方程進(jìn)行差分推導(dǎo),設(shè)置邊界條件和算法穩(wěn)定性條件進(jìn)而對電纜芯線上的響應(yīng)進(jìn)行求解。計(jì)算分析了不同端接電阻對終端電流響應(yīng)的影響。最后,通過對同軸電纜場線耦合問題建立內(nèi)系統(tǒng)和外系統(tǒng)模型,分析求解了電纜接地方式不同、土壤電導(dǎo)率不同、土壤介電常數(shù)不同、電磁波入射方位角不同時(shí),對電纜芯線上耦合感應(yīng)電流的影響。通過對感應(yīng)電流的分析,得出了一些有益的結(jié)論,對于工程實(shí)踐提供了理論指導(dǎo)。
[Abstract]:With the rapid development of science and technology and the increasing number of electromagnetic interference sources, the space electromagnetic environment becomes more and more complex. Usually, shielded cable, as the carrier of transmission signal between equipments, is often affected by space electromagnetic interference. Therefore, it is very important to study the field-wire coupling of shielded cable. Based on the finite-difference time-domain method (FDTD) and multi-conductor transmission line (MTL) theory, the coupling problem of shielded cable field and wire is divided into internal and external system models, which are calculated by Matlab programming. The influence of different factors on the response of shielded cable cored wire is analyzed. Firstly, this paper studies the theory of the finite-difference time-domain method (FDTD). By dividing the computational region of the FDTD, the discrete iteration of the Maxwell basic equation, the condition of numerical stability and the setting of the boundary condition, The selection of excitation sources and other aspects of the external system modeling should be paid attention to. The effects of different grounding modes of shielding layer and soil conductivity on the coupling response of shielding layer are calculated and analyzed. Then, the calculation of relevant parameters of shielded cable and the basic theory of multi-conductor transmission line are introduced. The transmission line model is used to analyze the internal system. By calculating the relevant parameters of the shielded cable, the transmission line equation is derived by differential method, and the boundary conditions and the stability conditions of the algorithm are set up to solve the response of the cable core wire. The influence of different terminal resistors on terminal current response is calculated and analyzed. Finally, the internal and external system models are established for the field-wire coupling problem of coaxial cable. The different grounding modes, different soil conductivity, different soil dielectric constant and different incident azimuth of electromagnetic wave are analyzed and solved. The effect on the coupling induced current on the cable core wire. Based on the analysis of induced current, some useful conclusions are drawn, which provide theoretical guidance for engineering practice.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM246

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本文編號(hào)：2437553