摘要
The fatigue load spectrum and operation life evaluation of key components in the catenary system under the high speed train running condition were investigated.Firstly,based on the catenary model and pantograph model,the couple dynamic equations of pantograph–catenary were built with the Lagrange’s method;then the dynamic contact force was obtained by the Newmark method at the train speeds of 250,280 and 300 km/h,respectively.Secondly,the finite element model(FEM)of one anchor section’s catenary was built to analyze its transient response under the contact force as train running;then the loading time history of messenger wire base,steady arm,registration tube,oblique cantilever,and straight cantilever were extracted.Finally,the key components’fatigue spectrum was carried out by the rain-flow counting method,and operation life was estimated in consideration of such coefficients,such as stress concentration,shape and dimension,surface treatment.The results show that the fatigue life of the catenary system reduces with the increasing of train speed;specifically,the evaluated fatigue life of the steady arm is shorter than other components.
本文研究了高速铁路接触网系统关键零部件在高速行车工况下的疲劳载荷谱和运行寿命。首先,基于受电弓模型与接触网模型,采用Lagrange法建立弓–网耦合动力学模型;采用Newmark法计算在250,280和300 km/h 3种行车速度下相应的动态接触力。其次,建立一个锚段内接触网的有限元模型,在行车工况的动态接触力作用下,计算接触网系统的瞬态响应;提取承力索、定位器、定位管、斜腕臂、直腕臂的载荷时间历程。最后,采用雨流计数法,统计得到关键零件的疲劳载荷谱,并考虑零件的应力集中系数、形状与尺寸系数、表面处理系数,进行寿命评估。结果表明:随着运行车速的提高,接触网的疲劳寿命会下降,其中定位器的疲劳寿命最短。
基金
Project(51175383)supported by the National Natural Science Foundation of China(NSF)
作者简介
Corresponding author:XIAO Xiao-hui,PhD,Professor;Tel:+86-27-68772247;E-mail:xhxiao@whu.edu.cn;ORCID:0000-0002-8212-2452.
