本文關(guān)鍵詞：通電條件下架空導(dǎo)線線股應(yīng)力及微風(fēng)振動(dòng)疲勞壽命研究　出處：《鄭州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 輸電導(dǎo)線 溫度 微風(fēng)振動(dòng) 分層應(yīng)力 疲勞壽命

【摘要】：運(yùn)行狀態(tài)下的架空輸電導(dǎo)線是帶電工作的,長(zhǎng)期承受張力、微風(fēng)振動(dòng)和溫度場(chǎng)的聯(lián)合作用。由于張力的存在,導(dǎo)線的微風(fēng)振動(dòng)疲勞屬于非對(duì)稱循環(huán)交變應(yīng)力下的疲勞問(wèn)題,還需要考慮平均應(yīng)力對(duì)疲勞壽命的影響。因?yàn)閷?dǎo)線鋼芯和鋁股線脹系數(shù)的不同,各股層的應(yīng)力和溫度之間的關(guān)系不盡相同,所以準(zhǔn)確分析導(dǎo)線在運(yùn)行溫度場(chǎng)中的應(yīng)力分布對(duì)精確計(jì)算輸電導(dǎo)線微風(fēng)振動(dòng)疲勞壽命很有必要。然而現(xiàn)有文獻(xiàn)很少涉及導(dǎo)線溫度對(duì)線股分層應(yīng)力及微風(fēng)振動(dòng)特性影響的研究,針對(duì)這一問(wèn)題,本文主要做了以下幾方面的工作:首先基于鋼芯鋁絞線的結(jié)構(gòu)分層特性,利用導(dǎo)線各股層的變形協(xié)調(diào)條件建立導(dǎo)線的力學(xué)平衡方程求解導(dǎo)線在張力和溫度作用下各股層的應(yīng)力,利用ANSYS建立導(dǎo)線的精細(xì)模型,加載后與理論計(jì)算值對(duì)比,驗(yàn)證理論的正確性,然后分析整體溫度和徑向溫度對(duì)外層鋁股張力的影響;然后分析了導(dǎo)線懸掛點(diǎn)處最外層鋁股因?qū)Ь�溫度的變化而引起的應(yīng)力變化。其次,介紹了導(dǎo)線微風(fēng)振動(dòng)的機(jī)理,通過(guò)研究導(dǎo)線振動(dòng)時(shí)微風(fēng)輸入功率、導(dǎo)線自阻尼功率,運(yùn)用能量平衡法對(duì)輸電導(dǎo)線振動(dòng)強(qiáng)度進(jìn)行了評(píng)估,然后分析了導(dǎo)線張力、地形和檔距對(duì)微風(fēng)振動(dòng)振幅的影響,著重分析了溫度、風(fēng)速共同作用對(duì)導(dǎo)線振動(dòng)的影響。最后,系統(tǒng)地介紹了導(dǎo)線壽命預(yù)測(cè)的詳細(xì)過(guò)程,著重分析了導(dǎo)線風(fēng)向、風(fēng)速概率分布,通過(guò)微風(fēng)振動(dòng)的動(dòng)彎應(yīng)力和導(dǎo)線線股的平均應(yīng)力,求解輸電線的等效交變應(yīng)力幅值;基于風(fēng)速、風(fēng)向的聯(lián)合概率,得到年平均微風(fēng)振動(dòng)時(shí)間;通過(guò)Miner線性累計(jì)損傷原理和輸電線的S-N曲線,評(píng)估輸電導(dǎo)線的疲勞壽命。研究了輸電線張力、地形、懸掛點(diǎn)高度,尤其是溫度對(duì)輸電導(dǎo)線疲勞壽命的影響程度。
[Abstract]:The overhead transmission lines in operation are live working and bear the combined action of tension wind vibration and temperature field for a long time due to the existence of tension. The wind vibration fatigue of conductors belongs to the fatigue problem under asymmetric cyclic alternating stress, and the influence of average stress on fatigue life should be considered, because of the difference of linear expansion coefficient between conductor steel core and aluminum strand. The relationship between stress and temperature of each layer is different. Therefore, it is necessary to accurately analyze the stress distribution of conductors in the operating temperature field in order to accurately calculate the fatigue life of transmission conductors in wind vibration. However, the existing literature rarely deals with the delamination stress of wire strands and the characteristics of wind vibration. Impact studies. To solve this problem, this paper mainly does the following work: firstly, based on the structural delamination characteristics of steel core aluminum strands. The stress of each layer under tension and temperature is solved by establishing the equilibrium equation of wire mechanics by using the deformation coordination condition of each layer of wire, and the fine model of conductor is established by using ANSYS. After loading, the validity of the theory is verified by comparing the calculated values with the theoretical values, and then the influence of the whole temperature and radial temperature on the tension of the outer aluminum strand is analyzed. Then the stress change of the outermost aluminum wire at the wire suspension point is analyzed. Secondly, the mechanism of the conductor breeze vibration is introduced, and the wind input power is studied when the conductor vibrates. The vibration intensity of transmission wire is evaluated by the energy balance method, and the influence of wire tension, topography and distance on the vibration amplitude of wind is analyzed, with emphasis on the temperature. Finally, the detailed process of traverse life prediction is systematically introduced, with emphasis on the analysis of wind direction and wind speed probability distribution. The equivalent alternating stress amplitude of the transmission line is solved by the dynamic bending stress of the breeze vibration and the average stress of the wire strands. Based on the combined probability of wind speed and wind direction, the average annual wind vibration time is obtained. The fatigue life of transmission line is evaluated by Miner linear cumulative damage principle and S-N curve of transmission line. The transmission line tension, topography and height of suspension point are studied. Especially the influence of temperature on the fatigue life of transmission lines.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75

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