本文選題：非線性振動(dòng) + 覆冰輸電線�。� 參考：《鄭州大學(xué)》2014年碩士論文

【摘要】：高壓輸電塔線體系作為重要的生命線工程，保證其安全運(yùn)行和防護(hù)意義重大。大跨度高柔性的輸電線在風(fēng)力作用下呈現(xiàn)明顯的非線性振動(dòng)特征，而在覆冰后該特性更復(fù)雜，受風(fēng)力作用甚至?xí)l(fā)生斷線倒塔等事故，造成嚴(yán)重的社會(huì)和經(jīng)濟(jì)損失，因此針對(duì)覆冰后輸電線在風(fēng)作用下的非線性振動(dòng)響應(yīng)的研究，具有重要的理論意義和工程實(shí)用價(jià)值，可以為線路設(shè)計(jì)和安全運(yùn)行提供有益參考和指導(dǎo)。 論文首先總結(jié)了目前國(guó)內(nèi)外針對(duì)覆冰線路動(dòng)力分析的研究現(xiàn)狀，包括對(duì)覆冰模型、倒塔、斷線、脫冰沖擊、舞動(dòng)等理論與試驗(yàn)方法的研究和存在的問(wèn)題，確定采用有限元方法進(jìn)行覆冰輸電線在風(fēng)力作用下和脫冰沖擊作用下的響應(yīng)分析等工作內(nèi)容，主要研究?jī)?nèi)容和結(jié)論如下： （1）輸電線本身具有大跨度、高柔性特點(diǎn)，覆冰后輸電線振動(dòng)特性和風(fēng)致作用下響應(yīng)更具復(fù)雜性，在計(jì)算分析中主要考慮其幾何非線性，首先推導(dǎo)了輸電線覆冰前和覆冰后找形理論解析方法。 （2）以柳東-桂林段500kV輸電線路覆冰災(zāi)害事故為例，采用ANSYS軟件建立跨度500m的四分裂導(dǎo)線-間隔棒體系有限元模型，通過(guò)對(duì)10mm、15mm、20mm和25mm厚度覆冰輸電線找形計(jì)算結(jié)果與覆冰前的結(jié)果對(duì)比發(fā)現(xiàn)，，輸電線的跨中垂度隨覆冰厚度增加而急劇增大，線路運(yùn)行張力也有大幅增加；當(dāng)覆冰25mm時(shí)，計(jì)算跨中垂度已超出了輸電線高度，輸電線路已不能正常運(yùn)行，雖然此時(shí)計(jì)算線張力并未超出設(shè)計(jì)運(yùn)行張力上限值。 （3）將覆冰四分裂導(dǎo)線-間隔棒體系模型簡(jiǎn)化為覆冰單導(dǎo)線模型，進(jìn)行了等效有效性的分析和驗(yàn)算；進(jìn)行了不同跨度、不同覆冰厚度、不均勻覆冰和不同覆冰模擬方法的模態(tài)分析，與輸電線覆冰前進(jìn)行對(duì)比，主要輸出比較了不同參數(shù)組合下的振型和頻率變化。 （4）根據(jù)風(fēng)場(chǎng)模擬技術(shù)，進(jìn)行了不同風(fēng)力、不同覆冰厚度和不同風(fēng)攻角下輸電線覆冰前后的時(shí)程分析，主要比較其跨中節(jié)點(diǎn)位移與加速度時(shí)程響應(yīng)變化規(guī)律、端部節(jié)點(diǎn)張力時(shí)程變化特性，輸出了不同工況組合下的加速度功率譜并分析其振動(dòng)特性，結(jié)果表明：整體上覆冰厚度越大，風(fēng)速越大，面內(nèi)和面外耦合振動(dòng)的幅值越大、能量越高，面外第一階擺動(dòng)對(duì)輸電線實(shí)際振動(dòng)形態(tài)的貢獻(xiàn)最大。比較實(shí)際三維脈動(dòng)風(fēng)場(chǎng)和僅考慮順風(fēng)向脈動(dòng)風(fēng)情況下覆冰輸電線響應(yīng)結(jié)果，發(fā)現(xiàn)位移、加速度和線張力時(shí)程值相差很小，說(shuō)明了目前線路規(guī)范設(shè)計(jì)中只考慮沿順風(fēng)向脈動(dòng)風(fēng)成分的做法是比較合理的。 （5）基于輸電線不均勻、不定期脫冰會(huì)引起導(dǎo)線大幅上跳甚至斷線和線路倒塔等事故，本文還進(jìn)行了10mm、15mm、20mm三種不同厚度覆冰導(dǎo)線全跨脫冰的瞬態(tài)動(dòng)力分析和脫冰響應(yīng)影響因素的分析，發(fā)現(xiàn)覆冰越厚，脫冰越集中，對(duì)線路危害越大；適當(dāng)降低線張拉力和設(shè)置阻尼器等措施也可以有效削弱脫冰引起的影響。
[Abstract]:As an important lifeline project, it is of great significance to ensure the safe operation and protection of high voltage transmission tower system. The large span and high flexibility transmission lines show obvious nonlinear vibration characteristics under the action of wind force, but after icing, the characteristics are more complicated, and wind force may even lead to accidents such as broken lines and inverted towers, resulting in serious social and economic losses. Therefore, the study of nonlinear vibration response of ice-coated transmission lines under the action of wind has important theoretical significance and practical engineering value, and can provide useful reference and guidance for the design and safe operation of transmission lines. Firstly, this paper summarizes the current research status of dynamic analysis of icing lines at home and abroad, including the research and existing problems of icing model, tower, breakage, deicing impact, galloping and other theory and test methods. The finite element method is used to analyze the response of icing transmission lines under wind force and deicing impact. The main research contents and conclusions are as follows: 1) the transmission line itself has the characteristics of long span and high flexibility. The vibration characteristics and wind-induced response of the ice-coated transmission line are more complicated. The geometric nonlinearity is mainly considered in the calculation and analysis. Firstly, the analytical method of shape finding before and after icing for transmission lines is derived. (2) taking the ice-covered disaster of 500kV transmission line in Liudong Guilin section as an example, the finite element model of 500m span four-split traverse spacer system is established by using ANSYS software. By comparing the shape finding results of 10 mm / 15 mm / 20 mm and 25mm thickness icing transmission lines with the results before icing, it is found that the midspan sag of transmission lines increases sharply with the increase of ice thickness, and the line running tension also increases significantly when the ice is covered with 25mm. The calculation of span sag has exceeded the transmission line height and the transmission line has been unable to operate normally although the calculated line tension does not exceed the upper limit of the design operation tension. The model of ice-coated four-split traverse and spacer rod system is simplified to the ice-coated single-wire model, and the equivalent validity analysis and checking calculation are carried out, and the different span and thickness of icing are carried out. The modal analysis of non-uniform icing and different icing simulation methods is compared with that of transmission lines before icing. The main output is compared with the modal and frequency changes under different parameter combinations. 4) according to the wind field simulation technology, the time-history analysis of transmission lines before and after icing with different wind force, different ice thickness and different wind attack angle is carried out. The characteristics of the end joint tension time history change, the acceleration power spectrum under different working conditions is outputted and its vibration characteristics are analyzed. The results show that the larger the ice thickness on the whole, the greater the wind speed, the larger the amplitude of in-plane and out-of-plane coupling vibration. The higher the energy, the most important contribution of the first order oscillation to the actual vibration shape of the transmission line. Comparing the response results of the actual three-dimensional pulsating wind field and the ice-coated transmission line only considering the downwind pulsating wind, it is found that the time history of displacement, acceleration and line tension is very small. It is reasonable to consider the pulsating wind component along the downwind direction in the design of the current line code. (5) because the transmission line is not uniform, the occasional deicing will cause the wire to jump sharply, even break the wire and the line tower, and so on. In this paper, the transient dynamic analysis and the analysis of the factors affecting the deicing response of three kinds of ice-coated conductors with different thickness are also carried out. It is found that the thicker the icing is, the more concentrated the deicing is, and the greater the harm to the line is. The effect of deicing can also be weakened by reducing the tension of wire and setting dampers.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM752

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