本文選題：線束 + 串?dāng)_　； 參考：《南京航空航天大學(xué)》2017年碩士論文

【摘要】：線纜是復(fù)雜電氣、電子系統(tǒng)中重要的連接部件,其長線的固有特點(diǎn)導(dǎo)致線纜容易受到電磁干擾,導(dǎo)致系統(tǒng)的可靠性降級甚至失效。在設(shè)計(jì)的早期階段預(yù)測線纜耦合電磁干擾可以讓設(shè)計(jì)人員及時(shí)解決潛在的電磁干擾問題,從而降低了后期整改的成本投入,因而受到了廣泛關(guān)注。目前對線纜間耦合電磁干擾的預(yù)測已經(jīng)有較多研究,研究內(nèi)容主要集中在線纜的耦合機(jī)理,對于線束這一典型對象所產(chǎn)生的耦合電磁干擾的預(yù)測仍需深入。為此,以多導(dǎo)體線束為研究對象,本文將開展一系列研究,主要包括以下幾部分:1.闡述了平行線纜間耦合電磁干擾噪聲預(yù)測模型的建立。利用模量轉(zhuǎn)換法,結(jié)合終端邊界條件求解多導(dǎo)體傳輸線方程;利用有限元軟件ANSYS獲取電磁參數(shù);還簡單介紹了矩量法,利用電磁仿真軟件FEKO驗(yàn)證本文建立的模型。2.深入研究了線束內(nèi)串?dāng)_噪聲的概率分布特性。線束內(nèi)導(dǎo)線存在扭絞、換位的特性,束內(nèi)導(dǎo)線間的串?dāng)_也具有不確定性。假定線束橫截面固定,導(dǎo)線的換位僅是改變導(dǎo)線位置,則每段導(dǎo)線都存在相同的互有參數(shù)分布。利用卷積獲得整個(gè)線束的互有參數(shù)概率分布,進(jìn)而利用蒙特卡洛方法求得線束內(nèi)串?dāng)_的概率分布特性。實(shí)驗(yàn)結(jié)果表明,線束的扭絞程度和線束內(nèi)串?dāng)_的概率分布規(guī)律密切相關(guān)。3.討論了在均勻外施激勵(lì)場條件下,線纜的場耦合模型。利用模量轉(zhuǎn)換法求解方程,并給出方程特解和待定系數(shù)的求解思路。在垂射式(垂直極化)和側(cè)射式(水平極化)兩種入射條件下,以均勻平面波為激勵(lì)源,對噪聲電壓進(jìn)行預(yù)測和仿真。對比結(jié)果表明,場耦合的噪聲大小與入射場的大小和方向、線束的幾何結(jié)構(gòu)有關(guān)。4.探究存在非均勻激勵(lì)場時(shí),噪聲預(yù)測的處理方法。對于非均勻復(fù)雜電磁場,其特解的求解不再是均勻平面波激勵(lì)的簡單情形。通過FEKO進(jìn)行電場采樣的方法,得到多導(dǎo)體傳輸線沿線等效電壓、電流源,利用三次樣條插值方法求得方程特解,進(jìn)而利用邊界條件獲得噪聲的仿真電壓。利用一個(gè)電偶極子產(chǎn)生的非均勻場的實(shí)例進(jìn)行仿真和對比驗(yàn)證。此外,搭建實(shí)驗(yàn)平臺在一電波暗室中依靠周期對數(shù)天線產(chǎn)生激勵(lì),在100~220MHz進(jìn)行測量,測量實(shí)驗(yàn)與仿真結(jié)果的趨勢基本吻合。
[Abstract]:Cable is an important connecting part in complex electrical and electronic system. The inherent characteristics of long wire lead to electromagnetic interference and downgrade or even invalidation of system reliability.In the early stage of the design, the cable coupling electromagnetic interference can be predicted for designers to solve the potential electromagnetic interference problem in time, thus reducing the cost of the later rectification investment, so it has attracted wide attention.At present, much research has been done on the prediction of coupling electromagnetic interference between cables and cables. The research mainly focuses on the coupling mechanism of cable, and the prediction of coupling electromagnetic interference caused by wire harness, a typical object, still needs to be further studied.Therefore, a series of studies will be carried out in this paper, including the following parts: 1: 1.The noise prediction model of coupled electromagnetic interference between parallel cables is presented.The method of modulus conversion and terminal boundary condition are used to solve the multi-conductor transmission line equation, the finite element software ANSYS is used to obtain the electromagnetic parameters, and the method of moments is briefly introduced, and the electromagnetic simulation software FEKO is used to verify the model. 2.The probability distribution of crosstalk noise in wire harness is studied.There are twisting and transposition of wires in the wire harness, and the crosstalk between the wires in the bundle is uncertain.Assuming that the cross section of the wire harness is fixed and the transposition of the conductor is only to change the position of the conductor, each section of the wire has the same distribution of mutual parameters.The probability distribution of mutual parameters is obtained by convolution, and the probability distribution of crosstalk in the harness is obtained by Monte Carlo method.The experimental results show that the twisting degree of the wire harness is closely related to the probability distribution of crosstalk in the wire harness.The field coupling model of cable is discussed under the condition of uniform external excitation field.The modulus conversion method is used to solve the equation, and the special solution of the equation and the solution of the undetermined coefficient are given.Under two kinds of incident conditions: vertical (vertical polarization) and lateral (horizontal polarization), the noise voltage is predicted and simulated with uniform plane wave as excitation source.The results show that the noise of the coupling is related to the size and direction of the incident field and the geometric structure of the wire harness.The processing method of noise prediction in the presence of nonuniform excitation field is explored.For the nonuniform complex electromagnetic field, the solution of the special solution is no longer a simple case of uniform plane wave excitation.The equivalent voltage and current source along the multi-conductor transmission line are obtained by the method of electric field sampling by FEKO. The special solution of the equation is obtained by using cubic spline interpolation method, and the simulation voltage of noise is obtained by using boundary conditions.An example of inhomogeneous field generated by an electric dipole is used for simulation and comparison.In addition, the experiment platform is built in an anechoic chamber to generate excitation based on the periodic logarithmic antenna, and the measurement is carried out in 100~220MHz. The experimental results are in good agreement with the simulation results.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN811

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