本文選題：覆冰舞動(dòng) + 氣動(dòng)特性�。� 參考：《華中科技大學(xué)》2013年博士論文

【摘要】：輸電線路的舞動(dòng)是低頻高幅的自激振動(dòng)，產(chǎn)生的巨大的能量對(duì)輸電線路的安全運(yùn)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(diǎn)更突出，舞動(dòng)引起的斷線及倒塔等嚴(yán)重電力事故頻發(fā)，對(duì)舞動(dòng)及其控制的研究對(duì)輸電線路的安全運(yùn)行具有重要的意義。本文從氣動(dòng)力風(fēng)洞試驗(yàn)、數(shù)值模擬兩個(gè)方面對(duì)覆冰導(dǎo)線的舞動(dòng)進(jìn)行了研究，主要內(nèi)容如下： 覆冰引起的氣動(dòng)不穩(wěn)是輸電線路舞動(dòng)的直接誘因，對(duì)覆冰導(dǎo)線氣動(dòng)特性的研究是解決舞動(dòng)問(wèn)題的基本，本文首先針對(duì)輸電線路的經(jīng)典覆冰類型和風(fēng)場(chǎng)特性設(shè)計(jì)了覆冰導(dǎo)線氣動(dòng)特性測(cè)力風(fēng)洞試驗(yàn)，分別進(jìn)行了均勻流和紊流風(fēng)場(chǎng)下的測(cè)力試驗(yàn)，得到了新月形、扇形、冠形在不同覆冰厚度下的氣動(dòng)特性，并研究了平均風(fēng)速大小，，紊流效應(yīng)及二維流場(chǎng)效應(yīng)等因素對(duì)覆冰導(dǎo)線氣動(dòng)特性的影響。 其次針對(duì)目前覆冰導(dǎo)線氣動(dòng)力特性數(shù)據(jù)匱乏的特點(diǎn)，采用FLUENT軟件進(jìn)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(dòng)特性仿真，基于風(fēng)洞試驗(yàn)結(jié)果驗(yàn)證了數(shù)據(jù)的可靠性。然后對(duì)氣動(dòng)力結(jié)果進(jìn)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(shù)公式，豐富了風(fēng)洞試驗(yàn)的結(jié)果，建立了詳細(xì)的覆冰導(dǎo)線氣動(dòng)力特性數(shù)據(jù)庫(kù)。 然后本文建立了輸電線的單自由度振子數(shù)學(xué)模型，基于準(zhǔn)定常理論采用多尺度方法推導(dǎo)了舞動(dòng)振幅的解析解，并采用Runge-Kutta方法編制了求解舞動(dòng)時(shí)程的數(shù)值仿真程序，與解析結(jié)果進(jìn)行了對(duì)比。本文系統(tǒng)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(shù)等參數(shù)對(duì)舞動(dòng)振幅的影響。針對(duì)舞動(dòng)過(guò)程中振幅大等特點(diǎn)，提出了一種利用舞動(dòng)現(xiàn)象進(jìn)行能量獲取的思路，并對(duì)不同覆冰形狀的截面的能量獲取率進(jìn)行了分析�；趩巫杂啥群蛢勺杂啥日褡酉到y(tǒng)，給出了舞動(dòng)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(lái)模擬覆冰導(dǎo)線的氣動(dòng)特性，同時(shí)在輸電塔上施加脈動(dòng)風(fēng)時(shí)程，進(jìn)行了輸電線舞動(dòng)以及輸電塔隨機(jī)振動(dòng)的顯式有限元計(jì)算。采用本文方法對(duì)500kV海門到汕頭榕江大跨越工程進(jìn)行了風(fēng)振計(jì)算，提出了施加防屈曲耗能支撐的控制方案，并對(duì)控制方案進(jìn)行了優(yōu)化。對(duì)壓重防舞技術(shù)和相間間隔棒防舞技術(shù)進(jìn)行了探討，給出了防舞方案的優(yōu)化設(shè)計(jì)思路，并對(duì)Port Credit線路進(jìn)行了防舞設(shè)計(jì)。
[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(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類號(hào)】：TM752;TU311.3

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本文編號(hào)：1875446