本文選題：非線性振動 + 覆冰輸電線�。� 參考：《鄭州大學》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，保證其安全運行和防護意義重大。大跨度高柔性的輸電線在風力作用下呈現(xiàn)明顯的非線性振動特征，而在覆冰后該特性更復雜，受風力作用甚至會發(fā)生斷線倒塔等事故，造成嚴重的社會和經(jīng)濟損失，因此針對覆冰后輸電線在風作用下的非線性振動響應的研究，具有重要的理論意義和工程實用價值，可以為線路設計和安全運行提供有益參考和指導。 論文首先總結(jié)了目前國內(nèi)外針對覆冰線路動力分析的研究現(xiàn)狀，包括對覆冰模型、倒塔、斷線、脫冰沖擊、舞動等理論與試驗方法的研究和存在的問題，確定采用有限元方法進行覆冰輸電線在風力作用下和脫冰沖擊作用下的響應分析等工作內(nèi)容，主要研究內(nèi)容和結(jié)論如下： （1）輸電線本身具有大跨度、高柔性特點，覆冰后輸電線振動特性和風致作用下響應更具復雜性，在計算分析中主要考慮其幾何非線性，首先推導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輸電線路覆冰災害事故為例，采用ANSYS軟件建立跨度500m的四分裂導線-間隔棒體系有限元模型，通過對10mm、15mm、20mm和25mm厚度覆冰輸電線找形計算結(jié)果與覆冰前的結(jié)果對比發(fā)現(xiàn)，，輸電線的跨中垂度隨覆冰厚度增加而急劇增大，線路運行張力也有大幅增加；當覆冰25mm時，計算跨中垂度已超出了輸電線高度，輸電線路已不能正常運行，雖然此時計算線張力并未超出設計運行張力上限值。 （3）將覆冰四分裂導線-間隔棒體系模型簡化為覆冰單導線模型，進行了等效有效性的分析和驗算；進行了不同跨度、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，與輸電線覆冰前進行對比，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)風場模擬技術，進行了不同風力、不同覆冰厚度和不同風攻角下輸電線覆冰前后的時程分析，主要比較其跨中節(jié)點位移與加速度時程響應變化規(guī)律、端部節(jié)點張力時程變化特性，輸出了不同工況組合下的加速度功率譜并分析其振動特性，結(jié)果表明：整體上覆冰厚度越大，風速越大，面內(nèi)和面外耦合振動的幅值越大、能量越高，面外第一階擺動對輸電線實際振動形態(tài)的貢獻最大。比較實際三維脈動風場和僅考慮順風向脈動風情況下覆冰輸電線響應結(jié)果，發(fā)現(xiàn)位移、加速度和線張力時程值相差很小，說明了目前線路規(guī)范設計中只考慮沿順風向脈動風成分的做法是比較合理的。 （5）基于輸電線不均勻、不定期脫冰會引起導線大幅上跳甚至斷線和線路倒塔等事故，本文還進行了10mm、15mm、20mm三種不同厚度覆冰導線全跨脫冰的瞬態(tài)動力分析和脫冰響應影響因素的分析，發(fā)現(xiàn)覆冰越厚，脫冰越集中，對線路危害越大；適當降低線張拉力和設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.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM752

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