發(fā)布時間：2018-05-08 11:42

  本文選題：輸電導線 + 覆冰荷載　； 參考：《沈陽建筑大學》2014年碩士論文

【摘要】：覆冰輸電導線舞動是輸電導線在冰、風等多種因素耦合激勵下的一種低頻率、大變形的非線性瞬態(tài)振動。在現(xiàn)實工程中,它直接威脅著輸電線路安全運行,例如當輸電導線舞動嚴重時,舞動會使相鄰輸電導線碰撞而產生閃絡,并引起跳閘,甚至使輸電體系癱瘓。因此,研究輸電導線舞動的原因和找出防止輸電導線舞動的方法具有重要的實際意義。研究輸電導線在靜力荷載下的形狀時,考慮相鄰檔與絕緣子對輸電導線端部約束的影響,找出輸電導線在靜力荷載作用下二維簡化模型,并推導沿輸電導線軸線的剛度系數(shù),然后用ANSYS中的APDL語言編寫了找出覆冰輸電導線形狀的程序,并用解析法驗證程序的可行性,最后筆者研究了不均勻覆冰荷載等因素對輸電導線形狀的影響。計算結果表明,在計算輸電導線找形時,應考慮不均勻覆冰對輸電導線懸垂狀態(tài)的影響。研究覆冰輸電導線在風荷載作用下舞動時,作者找出了輸電導線舞動時的三維簡化模型,并推導了等效彈簧剛度系數(shù),然后采用軸向不可壓縮材料及釋放彎曲自由度的bean188梁單元,利用ANSYS有限元分析軟件對覆冰輸電導線舞動現(xiàn)象進行研究,通過已有文獻驗證了有限元計算輸電導線舞動現(xiàn)象的有效性,最后比較了不同風速、初始風攻角、檔距、初張力及平動阻尼比等因素對輸電導線舞動規(guī)律和幅值大小的影響。研究結果表明,風速、初始風攻角、檔距、初張力及平動阻尼比等因素都影響著導線舞動的最大豎向振幅。在研究擾流繩防舞效果時,筆者先用Fluent軟件模擬了中山口覆冰導線的氣動力系數(shù),然后用中山口導線氣動力系數(shù)試驗數(shù)據驗證了筆者計算氣動力系數(shù)方法的可行性,最后筆者對纏繞擾流繩的覆冰導線氣動力系數(shù)做了分析。研究結果表明,擾流繩對抑制由Denhartog舞動機理引發(fā)的舞動效果比較好,但對由Nigol扭轉舞動機理引發(fā)的舞動效果不是很好。
[Abstract]:Iced transmission wire galloping is a kind of nonlinear transient vibration with low frequency and large deformation under coupling excitation of ice wind and other factors. In practical engineering, it directly threatens the safe operation of transmission line. For example, when the transmission line gallops seriously, the galloping will make the adjacent transmission line collide and cause flashover, and cause tripping, even paralyze the transmission system. Therefore, it is of great practical significance to study the causes of transmission wire galloping and to find out the methods to prevent transmission wire galloping. When studying the shape of transmission wire under static load, considering the influence of adjacent file and insulator on the constraint of transmission wire end, the simplified two-dimensional model of transmission wire under static load is found, and the stiffness coefficient along the axis of transmission line is deduced. Then the program of finding the shape of iced transmission conductor is written by APDL language in ANSYS, and the feasibility of the program is verified by analytical method. Finally, the influence of factors such as uneven icing load on the shape of transmission wire is studied. The results show that the influence of non-uniform icing on the traverse drape state should be considered in the calculation of transmission wire shape finding. In this paper, the simplified three-dimensional model for the galloping of iced transmission conductors under wind load is found, and the equivalent spring stiffness coefficient is derived. Then using the axial incompressible material and the bean188 beam element which releases the bending degree of freedom, the galloping phenomenon of the ice-coated transmission wire is studied by using the ANSYS finite element analysis software. The effectiveness of finite element method for calculating the galloping phenomenon of transmission lines is verified by existing literatures. Finally, the effects of different wind speed, initial wind attack angle, span distance, initial tension and translational damping ratio on the galloping law and amplitude of transmission lines are compared. The results show that the maximum vertical amplitude of galloping is affected by wind speed, initial wind angle of attack, spacing, initial tension and the ratio of translational damping. In order to study the anti-dance effect of spoiler rope, the author first simulates the aerodynamic coefficient of ice-coated wire in Zhongshan mouth with Fluent software, and then verifies the feasibility of calculating aerodynamic coefficient method with the test data of aerodynamic coefficient of Zhongshan mouth conductor. Finally, the aerodynamic coefficient of ice-coated wire is analyzed. The results show that the scrambling rope has a better effect on restraining the Denhartog galloping mechanism, but it is not very good on the Nigol torsional galloping mechanism.
【學位授予單位】：沈陽建筑大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM752;TU312.1

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本文編號：1861256