摘要
为抑制兰新高铁大风区正馈线舞动,保证列车安全运行,首先,设计新型低风压正馈线,仿真获取常规正馈线和低风压正馈线在不同风载荷下的气动力参数和舞动幅值,并进行对比分析;其次,对防舞效果较佳的3种低风压正馈线建立三维有限元模型,并施加拉伸载荷,模拟正馈线舞动时的受力情况;最后,分析低风压正馈线形变及应力变化.结果表明:低风压正馈线自由端形变量远大于固定端,铝股线形变量大于钢股线,且越往外层,股线形变量越大;在绞线制造时可以考虑将钢层和铝层交替绞合,以平衡绞线的导电性和刚性.在股线相互接触的位置出现了应力集中,应力集中位置与股线绞合方向相同;在绞线制造时,可以考虑在股线表面覆缓冲层,以减缓正馈线舞动时股线之间的振荡冲击,并延长正馈线的使用寿命;低风压正馈线模型的凹槽小圆弧半径与常规正馈线半径的比值越大,最外层铝股线的形变越大,正馈线舞动时越容易断股;在低风压正馈线选型时应该综合考虑,平衡防舞有效性与使用寿命.
In order to restrain the galloping amplitude of the positive feeder in the gale area of the Lanzhou‒Urumuqi high-speed railway and ensure the safe operation of the train,firstly,a novel type of lowwind-pressure catenary positive feeder was designed,and the aerodynamic parameters and galloping amplitude of the conventional catenary positive feeder and the low-wind-pressure catenary positive feeder under different wind loads were simulated and compared.Then,a three-dimensional finite element model of the low-wind-pressure catenary positive feeders with the three better anti-galloping effects was established and tensile loads were applied to simulate the stress condition of the positive feeder when the positive feeders were galloping.Finally,the deformation and variation stress of the low-wind-pressure catenary positive feeder were analyzed.The results show that,the deformation of the free end of the catenary positive feeder is much larger than that of the fixed end,the deformation of the aluminum strand layer is larger than that of the steel strand layer,and the further to the outer layer,the larger the strand deformation,twining alternately steel and aluminum layers can be considered in the feeder manufacturing to balance the electroconductibility and rigidity.The stress concentration occurs at the location where the strands squeezing with each other,and the stress concentration position is the same as the direction of the strand twining with each other.A buffer layer should be considered on the surface of the strands during the positive feeder manufacturing,to mitigate oscillatory shock between the strands when the positive feeder galloping,and to prolong the service life of the positive feeder.The larger the ratio of the groove radius of the low-wind-pressure catenary positive feeder to the radius of the conventional feeder,the greater the deformation of the outermost aluminum strands,the strands are more likely to break when the positive feeder is galloping.Therefore,the type selection of low wind pressure positive feeder should be comprehensively considered to balance the anti-galloping effectiveness and the service life.
作者
赵珊鹏
张永丰
张友鹏
王思华
ZHAO Shanpeng;ZHANG Yongfeng;ZHANG Youpeng;WANG Sihua(School of Automatic and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Rail Transit Electrical Automation Engineering Laboratory of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2023年第5期1154-1161,共8页
Journal of Southwest Jiaotong University
基金
国家自然科学基金(51867013)
甘肃省自然科学基金(22JR5RA359)。
关键词
兰新高铁
大风区
正馈线舞动
低风压正馈线
受力特性分析
Lanzhou‒Urumuqi high-speed railway
gale area
galloping of positive feeder
low-wind-pressure positive feeder
analysis of mechanical characteristic
