【摘要】：輸電線路是重要的生命線工程，由冰災(zāi)造成的輸電塔倒塔多次出現(xiàn)，給社會帶來了巨大危害。據(jù)2008年雨雪冰凍災(zāi)害的災(zāi)后調(diào)查，冰災(zāi)中90%左右的倒塔都是由于不均勻覆冰-脫冰產(chǎn)生的縱向不平衡張力造成。在中國輸電線路的設(shè)計規(guī)范中，僅考慮靜態(tài)不均勻覆冰荷載，而導(dǎo)線脫冰產(chǎn)生的不平衡張力遠(yuǎn)大于覆冰靜止?fàn)顟B(tài)，為保證輸電線路覆冰安全，必須考慮其脫冰不平衡張力。本文采用有限元數(shù)值仿真方法對脫冰不平衡張力進(jìn)行了系統(tǒng)的研究，，主要內(nèi)容如下： 首先，本文建立了輸電塔-線體系精細(xì)有限元模型，并基于非線性理論對輸電線初始構(gòu)形進(jìn)行了研究。以輸電塔影響、脫冰方式和脫冰檔位置為研究對象，提出了輸電塔-線體系脫冰簡化模型，并對其有效性進(jìn)行了分析。 其次，基于本文提出的脫冰簡化模型，系統(tǒng)的研究了檔數(shù)、檔距、懸掛點高差、覆冰厚度、脫冰率等參數(shù)對脫冰不平衡張力的影響，得出了考慮多參數(shù)的脫冰不平衡張力簡化經(jīng)驗公式，進(jìn)一步通過Unzipping形式脫冰模擬研究，給出了考慮脫冰速度影響的脫冰不平衡張力修正公式。 然后，基于FLUENT的大渦模擬方法對覆冰導(dǎo)線阻力系數(shù)進(jìn)行了三維仿真，得到了在不同轉(zhuǎn)角下圓形覆冰和新月形覆冰四分裂導(dǎo)線的阻力系數(shù)，并對其正確性進(jìn)行了驗證。同時根據(jù)諧波合成法，采用雙索引頻率和FFT算法模擬了輸電線路20m/s脈動風(fēng)風(fēng)速時程，研究了平均風(fēng)和脈動風(fēng)對脫冰不平衡張力的影響，并得出了脈動風(fēng)動力放大系數(shù)值。 最后，提出了抗壓柔性相間間隔棒的力學(xué)模型，比較了三種典型相間間隔棒模型的減振效果。基于相同的脫冰工況，對粘彈鉛芯阻尼器的減振性能進(jìn)行了分析，研究了阻尼器參數(shù)類型和布置工況的減振影響，給出了粘彈鉛芯阻尼器優(yōu)化布置方案。
[Abstract]:Transmission line is an important lifeline project. The tower collapse caused by ice disaster appears many times, which brings great harm to the society. According to the survey of rain and snow ice disaster in 2008, 90% of the toppling tower in the ice disaster is caused by the longitudinal unbalanced tension caused by uneven icing and deicing. In the design code of transmission lines in China, only static non-uniform icing load is considered, and the unbalanced tension caused by wire deicing is much larger than that of icing static state. In order to ensure the icing safety of transmission lines, the deicing unbalanced tension must be considered. In this paper, the unbalance tension of deicing is studied systematically by using finite element method. The main contents are as follows: firstly, the fine finite element model of transmission tower and line system is established in this paper. The initial configuration of transmission line is studied based on nonlinear theory. Taking the influence of transmission tower, deicing mode and deicing position as the research object, a simplified model of deicing for transmission tower-line system is proposed, and its effectiveness is analyzed. Secondly, based on the simplified deicing model proposed in this paper, the effects of the parameters such as number of files, spacing, height difference of suspension point, ice thickness and deicing rate on the unbalance tension of deicing are systematically studied. The simplified empirical formula of deicing unbalance tension considering multiple parameters is obtained. Furthermore, through the simulation study of deicing in Unzipping form, the deicing unbalanced tension correction formula considering the effect of deicing speed is given. Then, based on the large eddy simulation method of FLUENT, the drag coefficient of ice-coated lead is simulated, and the resistance coefficient of circular ice-coated and crescent ice-coated four-split lead is obtained at different rotation angles, and its correctness is verified. According to the harmonic synthesis method, double index frequency and FFT algorithm are used to simulate the time history of the pulsating wind speed of the transmission line. The influence of the average wind and the pulsating wind on the deicing unbalance tension is studied, and the dynamic magnification factor of the pulsating wind is obtained. Finally, the mechanical model of flexible interphase spacer bar under compression is proposed, and the damping effect of three typical interphase spacer rod models is compared. Based on the same deicing condition, the vibration absorption performance of viscoelastic lead damper is analyzed, the effects of damper parameter types and layout conditions on vibration reduction are studied, and the optimal layout scheme of viscoelastic lead damper is presented.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TM752;TU31

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本文編號：2380550