大风区高速铁路接触网AF线抗风研究

Research on Wind Resistance of High-speed Railway Catenary AF Line in Strong Wind Area

兰新高铁开通后在百里、三十里大风区内时常发生附加导线正馈线(AF)大幅振动,并且造成线索疲劳断股、零部件磨损失效等故障,严重威胁铁路运营安全。采用理论与现场实际相结合的方法,利用ANSYS—Fluent进行模拟风场仿真计算,对挡风墙增速效应及线索同阶次共振频率进行分析。基于接触网专项抗风技术科学性研究的基础上,结合风场分析结果,提出AF恒张力补偿设计方案,以改变风场与AF线频率。建立试验段进行方案试验,并利用试验段现场在线监测设备进行数据采集。本次的AF线恒张力补偿设计,解决了悬挂点、电连接、补偿装置、限制架等四大关键性技术难题,是一种长期、有效的抗风措施。

After the opening of Lanzhou to Urumqi High-speed Railway,the additional feeder（ AF） line often encounters significant vibration in the hundred-mile and thirty-mile of wind areas,suffering such failures as wire breakage and component wear-out,which seriously threaten the railway operation. In this paper,with combined theoretical and practical method,wind field simulating calculation is conducted by ANSYS-Fluent,and the growth effect on the wind wall and the same order resonance frequency of the wire are analyzed. Based on scientific researches on special anti-wind technology of the catenary,and in combination with the results of wind field analysis, the design scheme of AF constant tension compensation is proposed to change the frequency of wind field and AF line. An experimental section is set up to perform scheme tests and on-line monitoring equipment of the experimental section is used for data acquisition. The design of AF line constant tension compensation solves the four key technical problems as suspension point,electric connection,compensation device and limit frame,and proves to be a long-term and effective anti-wind measure.