【摘要】：近年來(lái),隨著航空、航天器功能的日漸復(fù)雜化,大量捆扎線纜束敷設(shè)在有限空間內(nèi),這會(huì)造成機(jī)載線纜束所面臨的電磁環(huán)境更加惡劣,因此在研發(fā)階段通過(guò)數(shù)值計(jì)算預(yù)測(cè)捆扎線纜束的電磁耦合水平顯得尤為重要。本課題開(kāi)展了捆扎線纜束耦合效應(yīng)不確定性問(wèn)題的仿真研究,提出單位長(zhǎng)度寄生電參數(shù)計(jì)算模型,結(jié)合多項(xiàng)式混沌法實(shí)現(xiàn)隨機(jī)捆扎線纜束耦合效應(yīng)的不確定性分析,提高了線纜束電磁耦合效應(yīng)仿真分析的有效性和實(shí)用性,夯實(shí)線纜相關(guān)電磁兼容仿真計(jì)算技術(shù)的理論基礎(chǔ)。首先,本課題介紹了基于鏡像法的雙導(dǎo)體傳輸線單位長(zhǎng)度寄生電參數(shù)計(jì)算模型,結(jié)合相關(guān)電磁場(chǎng)理論,將線纜束幾何結(jié)構(gòu)參數(shù)轉(zhuǎn)化為單位長(zhǎng)度寄生電參數(shù)。在此基礎(chǔ)上利用Legendre插值,將雙導(dǎo)體計(jì)算模型推廣到多導(dǎo)體,可以實(shí)現(xiàn)多導(dǎo)體捆扎線纜束寄生電參數(shù)的計(jì)算,有效的解決了鄰近效應(yīng)的問(wèn)題。Ansoft Q3D Extractor軟件仿真結(jié)果表明,所提出的傳輸線寄生電參數(shù)計(jì)算模型計(jì)算結(jié)果準(zhǔn)確,平均相對(duì)誤差在1.05%以內(nèi),可以用于對(duì)線纜束耦合效應(yīng)的分析。線纜束的耦合效應(yīng)主要包括線間耦合和場(chǎng)線耦合效應(yīng),其中線間耦合效應(yīng)指的是串?dāng)_。為具體分析隨機(jī)捆扎線纜束的串?dāng)_效應(yīng),建立了基于多導(dǎo)體傳輸線理論的串?dāng)_模型,其頻域分析結(jié)果由基于場(chǎng)求解方法的CST軟件和串?dāng)_實(shí)驗(yàn)驗(yàn)證。隨后建立了以線纜束幾何結(jié)構(gòu)參數(shù)為不確定性參量的線纜束串?dāng)_隨機(jī)模型,應(yīng)用多項(xiàng)式混沌法對(duì)雙導(dǎo)體和多導(dǎo)體算例進(jìn)行不確定性分析,分析結(jié)果由蒙特卡洛算法驗(yàn)證。計(jì)算結(jié)果表明,多項(xiàng)式混沌法的平均相對(duì)誤差在2.69%以內(nèi),計(jì)算效率可提高100倍左右,兼具較高的計(jì)算準(zhǔn)確度與計(jì)算效率。線纜束的場(chǎng)線耦合效應(yīng)在實(shí)際工程中應(yīng)用更廣,同樣基于多導(dǎo)體傳輸線理論建立場(chǎng)線耦合模型,其頻域分析結(jié)果的有效性仍由CST軟件驗(yàn)證。針對(duì)不同的不確定性參量,將場(chǎng)線耦合的不確定性問(wèn)題分為兩類,分別是以入射場(chǎng)參數(shù)為不確定性參量的第一類場(chǎng)線耦合問(wèn)題和以線纜束幾何結(jié)構(gòu)參數(shù)和入射場(chǎng)參數(shù)同時(shí)為不確定性參量的第二類場(chǎng)線耦合問(wèn)題。應(yīng)用多項(xiàng)式混沌法對(duì)兩類場(chǎng)線耦合問(wèn)題的雙導(dǎo)體和多導(dǎo)體算例進(jìn)行不確定性分析,分析結(jié)果由蒙特卡洛算法驗(yàn)證。計(jì)算結(jié)果表明,多項(xiàng)式混沌法的平均相對(duì)誤差在4.80%以內(nèi),計(jì)算效率可提高400~1000倍,在復(fù)雜線纜耦合問(wèn)題中效率提高更加明顯。
[Abstract]:In recent years, with the increasing complexity of aerospace and spacecraft functions, a large number of bundled cable bundles are laid in limited space, which will result in an even worse electromagnetic environment for airborne cable bundles. Therefore, it is very important to predict the electromagnetic coupling level of bundled cable bundles by numerical calculation in R & D stage. In this paper, a simulation study on the uncertainty of coupling effect of bundled cable bundles is carried out, and a calculation model of parasitic electrical parameters per unit length is proposed. The uncertainty analysis of coupling effect of random bundles is realized by means of polynomial chaos method. It improves the effectiveness and practicability of the simulation and analysis of the electromagnetic coupling effect of cable bundles and compacts the theoretical basis of the simulation and calculation technology of cable correlation electromagnetic compatibility. Firstly, the model of parasitic electrical parameters per unit length of double-conductor transmission lines based on mirror image method is introduced, and the geometric parameters of cable bundles are transformed into parasitic electrical parameters of unit length in combination with the theory of electromagnetic field. On this basis, the calculation model of double conductors is extended to multi-conductor by using Legendre interpolation. The parasitic electric parameters of multi-conductor bundles can be calculated, and the problem of proximity effect can be solved effectively. The simulation results of Ansoft Q3D Extractor software show that, The calculation results of parasitic electrical parameters of transmission lines are accurate and the average relative error is less than 1.05%, which can be used to analyze the coupling effect of cable bundles. The coupling effects of cable bundles mainly include interline coupling and field-line coupling, and the midline coupling effect refers to crosstalk. In order to analyze the crosstalk effect of random bundles, a crosstalk model based on multi-conductor transmission line theory is established. The frequency domain analysis results are verified by CST software and crosstalk experiment based on field solution method. Then a stochastic model of cable bundles crosstalk with geometric structural parameters of cable bundles as uncertain parameters is established. The uncertainty analysis of double conductors and multi-conductor examples is carried out by using polynomial chaos method. The results are verified by Monte Carlo algorithm. The results show that the average relative error of the polynomial chaos method is less than 2.69%, and the calculation efficiency can be improved by about 100 times. The field-line coupling effect of cable bundles is more widely used in practical engineering. The field-line coupling model is also established based on the multi-conductor transmission line theory. The validity of the analysis results in frequency domain is still verified by CST software. For different uncertainty parameters, the field line coupling uncertainty problem is divided into two categories. It is the first kind of field line coupling problem which takes the incident field parameter as the uncertainty parameter and the second kind field line coupling problem which takes the cable beam geometric structure parameter and the incident field parameter simultaneously as the uncertain parameter. In this paper, the polynomial chaos method is used to analyze the uncertainty of double conductors and multi-conductors for two kinds of field-line coupling problems. The results are verified by Monte Carlo algorithm. The results show that the average relative error of the polynomial chaos method is less than 4.80%, and the computational efficiency can be increased by 400 ~ 1000 times, especially in the complex cable coupling problem.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：V24;V211

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