摘要
为分析大风区段接触网多跨距正馈线的舞动特性,以兰新高铁正馈线为研究对象构建其3维有限元模型,并验证模型的准确性。考虑悬垂线夹自由度对导线舞动的影响,利用空气动力学理论研究气动特性,由Davenport函数模拟随机风场。对比分析单跨与多跨正馈线舞动的幅频特性,并对多跨正馈线中仅有一跨满足舞动条件的工况进行了研究。研究结果表明:在相同的风速下,风速大于10 m/s时多跨正馈线的舞动幅值、平均应力均大于单跨;单跨以及风速小于或等于15 m/s时的多跨正馈线水平方向舞动幅值大于垂直方向舞动幅值;当风速大于20 m/s时,正馈线舞动幅值呈减小趋势,且在多跨正馈线舞动模式中存在2个半波。同时,受悬垂线夹自由度的影响,相邻跨正馈线之间存在舞动波的传递现象,导线易受相邻跨舞动波的影响而发生舞动。通过该研究可以更加全面、深刻地认识正馈线舞动机理,也可为现场正馈线的舞动防治提供理论支撑。
To analyze the galloping characteristics of catenary multi-span positive feeder in gale areas,the positive feeder of Lanzhou-Urumqi high-speed railway is taken as the research object,a 3D finite element model is built and the accuracy of the model is verified.Considering the influence of the degree of freedom of suspension clamp on conductor galloping,the aerodynamic characteristic is studied by using the aerodynamic theory,and the stochastic wind field is simulated by the Davenport function.The amplitude frequency characteristics of single span and multi-span positive feeder galloping are compared and analyzed,and the condition that only one of the multi-span positive feeders meets galloping condition is studied.The results show that,under the same wind speed,when the wind speed is greater than 10 m/s,the galloping amplitude and average stress of multi-span positive feeder are greater than those of single span.The horizontal galloping amplitude of single span and multi-span positive feeders with wind speed less than or equal to 15 m/s is greater than that in the vertical direction.When the wind speed is greater than 20 m/s,the galloping amplitude of positive feeder decreases.There are two half waves in the galloping mode of multi-span positive feeder.At the same time,due to the influence of the degree of freedom of suspension clamp,there is a galloping wave transmission phenomenon between adjacent span positive feeders and the conductor is prone to galloping due to the influence of adjacent span galloping wave.This study can more comprehensively and deeply reveal the galloping mechanism of the positive feeders and provide theoretical support for the prevention of positive feeder galloping on site.
作者
张友鹏
王鹏
赵珊鹏
王思华
张宸瑞
ZHANG Youpeng;WANG Peng;ZHAO Shanpeng;WANG Sihua;ZHANG Chenrui(School of Automatic&Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Rail Transit Electrical Automation Engineering Laboratory of Gansu Province,Lanzhou 730070,China;Urumqi Power Supply Company,State Grid Xinjiang Electric Power Company,Urumqi 830000,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第9期3612-3623,共12页
High Voltage Engineering
基金
国家自然科学基金(51867013)
兰州交通大学天佑创新团队计划(TY202010)。
关键词
大风区
挡风墙
正馈线
多跨距
舞动响应
gale area
wind-break wall
positive feeder
multi-span
galloping response
