發(fā)布時間：2018-05-11 20:24

  本文選題：覆冰舞動 + 氣動特性　； 參考：《華中科技大學》2013年博士論文

【摘要】：輸電線路的舞動是低頻高幅的自激振動，產生的巨大的能量對輸電線路的安全運行造成極大的隱患和危害，隨著輸電塔高度的增加及輸電線路檔距的增大，架空輸電線高柔的特點更突出，舞動引起的斷線及倒塔等嚴重電力事故頻發(fā)，對舞動及其控制的研究對輸電線路的安全運行具有重要的意義。本文從氣動力風洞試驗、數值模擬兩個方面對覆冰導線的舞動進行了研究，主要內容如下： 覆冰引起的氣動不穩(wěn)是輸電線路舞動的直接誘因，對覆冰導線氣動特性的研究是解決舞動問題的基本，本文首先針對輸電線路的經典覆冰類型和風場特性設計了覆冰導線氣動特性測力風洞試驗，分別進行了均勻流和紊流風場下的測力試驗，得到了新月形、扇形、冠形在不同覆冰厚度下的氣動特性，并研究了平均風速大小，，紊流效應及二維流場效應等因素對覆冰導線氣動特性的影響。 其次針對目前覆冰導線氣動力特性數據匱乏的特點，采用FLUENT軟件進行了新月形、扇形、冠形三種覆冰截面在五種覆冰厚度下的氣動特性仿真，基于風洞試驗結果驗證了數據的可靠性。然后對氣動力結果進行了曲線擬合，得出了各覆冰截面在不同覆冰厚度及初始凝冰角下的豎向升力系數公式，豐富了風洞試驗的結果，建立了詳細的覆冰導線氣動力特性數據庫。 然后本文建立了輸電線的單自由度振子數學模型，基于準定常理論采用多尺度方法推導了舞動振幅的解析解，并采用Runge-Kutta方法編制了求解舞動時程的數值仿真程序，與解析結果進行了對比。本文系統的研究了覆冰截面、覆冰厚度、初始凝冰角以及升力曲線階數等參數對舞動振幅的影響。針對舞動過程中振幅大等特點，提出了一種利用舞動現象進行能量獲取的思路，并對不同覆冰形狀的截面的能量獲取率進行了分析�；�于單自由度和兩自由度振子系統，給出了舞動穩(wěn)定性的判別公式。 最后采用有限元程序ANSYS/LS-DYNA，建立非線性粘性阻尼器單元來模擬覆冰導線的氣動特性，同時在輸電塔上施加脈動風時程，進行了輸電線舞動以及輸電塔隨機振動的顯式有限元計算。采用本文方法對500kV海門到汕頭榕江大跨越工程進行了風振計算，提出了施加防屈曲耗能支撐的控制方案，并對控制方案進行了優(yōu)化。對壓重防舞技術和相間間隔棒防舞技術進行了探討，給出了防舞方案的優(yōu)化設計思路，并對Port Credit線路進行了防舞設計。
[Abstract]:The galloping of transmission line is the self-excited vibration of low frequency and high amplitude. The huge energy generated by it causes great hidden trouble and harm to the safe operation of transmission line. With the increase of the height of transmission tower and the increase of transmission line distance, The characteristics of overhead transmission lines are more prominent. The frequent occurrence of serious power accidents such as broken lines and inverted towers caused by galloping is of great significance to the study of galloping and its control for the safe operation of transmission lines. In this paper, the galloping of ice-covered conductors is studied from aerodynamic wind tunnel test and numerical simulation. The main contents are as follows: The aerodynamic instability caused by icing is the direct inducement of transmission line galloping, and the study of aerodynamic characteristics of ice-coated conductors is the basic to solve the galloping problem. In this paper, wind tunnel tests on aerodynamic characteristics of ice-coated conductors are first designed for the classical icing type and wind field characteristics of transmission lines. The force measurement tests under uniform flow and turbulent wind field are carried out respectively, and the crescent and fan shapes are obtained. The aerodynamic characteristics of the coronal shape under different icing thickness were studied. The effects of the mean wind speed, turbulence effect and two-dimensional flow field on the aerodynamic characteristics of ice-coated conductors were studied. Secondly, aiming at the lack of aerodynamic characteristic data of icing conductor at present, the aerodynamic characteristics of crescent section, sector section and coronal section under five kinds of ice thickness are simulated by FLUENT software. The reliability of the data is verified based on the wind tunnel test results. Then the curve fitting of aerodynamic results is carried out, and the formulas of vertical lift coefficient of each icing section under different ice thickness and initial freezing angle are obtained, which enriches the results of wind tunnel test. A detailed database of aerodynamic characteristics of ice-coated conductors is established. Then the mathematical model of single degree of freedom oscillator of transmission line is established, and the analytical solution of galloping amplitude is derived by using multi-scale method based on quasi-steady theory, and the numerical simulation program for solving the galloping time history is compiled by using Runge-Kutta method. The results are compared with the analytical results. In this paper, the effects of icing cross section, ice thickness, initial freezing angle and the order of lift curve on the galloping amplitude are systematically studied. According to the characteristics of large amplitude in the process of galloping, this paper puts forward a method of energy acquisition by using the phenomenon of galloping, and analyzes the energy acquisition rate of the sections with different icing shapes. Based on the system of single degree of freedom and two degree of freedom, the formula of judging the stability of galloping is given. Finally, a nonlinear viscous damper element is established to simulate the aerodynamic characteristics of ice-coated conductors by using the finite element program ANSYS / LS-DYNA.At the same time, the pulsating wind time history is applied to the transmission tower, and the explicit finite element calculation of the transmission line dance and the random vibration of the transmission tower is carried out. In this paper, the wind-induced vibration of 500kV Haimen to Shantou Rong River Crossing Project is calculated, and the control scheme of applying anti-buckling energy dissipation support is put forward, and the control scheme is optimized. This paper discusses the technique of anti-dance of pressure weight and interphase spacer, and gives the optimized design idea of the scheme of anti-dance, and designs the anti-dance of Port Credit circuit.
【學位授予單位】：華中科技大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TM752;TU311.3

【參考文獻】

相關期刊論文 前10條

1 孫珍茂;樓文娟;;覆冰輸電導線舞動非線性有限元分析[J];電網技術;2010年12期

2 何锃,趙高煜;分裂導線扭轉舞動分析的動力學建模[J];工程力學;2001年02期

3 沈國輝;袁光輝;孫炳楠;樓文娟;;覆冰脫落對輸電塔線體系的動力沖擊作用研究[J];工程力學;2010年05期

4 龍曉鴻;李黎;胡亮;;四渡河懸索橋抖振響應時域分析[J];工程力學;2010年S1期

5 王昕;樓文娟;;覆冰導線舞動數值解及影響因素分析[J];工程力學;2010年S1期

6 李黎;曹化錦;肖鵬;夏正春;;輸電線覆冰舞動的簡化分析方法[J];工程力學;2011年S2期

7 馬文勇;顧明;;考慮擺動效應的覆冰導線兩自由度馳振穩(wěn)定性分析[J];工程力學;2012年01期

8 劉春城;劉佼;;輸電線路導線覆冰機理及雨凇覆冰模型[J];高電壓技術;2011年01期

9 李黎;曹化錦;羅先國;姜維;;輸電塔-線體系的舞動及風振控制[J];高電壓技術;2011年05期

10 巢亞鋒;蔣興良;畢茂強;陳凌;張志勁;舒立春;;導線覆冰厚度的直徑訂正系數[J];高電壓技術;2011年06期

相關博士學位論文 前5條

1 王昕;覆冰導線舞動風洞試驗研究及輸電塔線體系舞動模擬[D];浙江大學;2011年

2 劉小會;覆冰導線舞動非線性數值模擬方法及風洞模型試驗[D];重慶大學;2011年

3 黃濤;大跨越高壓輸電線路非線性舞動理論研究[D];華中科技大學;2007年

4 夏正春;特高壓輸電線的覆冰舞動及脫冰跳躍研究[D];華中科技大學;2008年

5 王少華;輸電線路覆冰導線舞動及其對塔線體系力學特性影響的研究[D];重慶大學;2008年

本文編號：1875446