基于雨流计数法的弹性链型柔性悬挂接触网疲劳寿命分析

采用APDL语言编制命令流,对弹性链型悬挂接触网的接触线进行疲劳寿命估算。文中给出了求解接触线寿命的步骤,采用改进的雨流计数法处理接触线的疲劳应力谱,得到各单元的各级应力幅值、应力均值与相应的应力循环数,用Miner线性疲劳累积损伤理论得到接触线各单元的疲劳寿命值。在相同参数的条件下,分析了影响接触线寿命的因素,包括跨距、接触线和承力索预张力、截面面积、列车行驶速度、抬升力、干摩擦等,比较简单链型和弹性链型悬挂接触网对接触线寿命的影响,对比各种参数找出影响接触线疲劳寿命的几个关键因素,为弹性链型悬挂接触网系统的设计和工程实际施工与维护提供重要依据。

The fatigue analysis on the elastic chain flexible suspension catenary system based on rain-flow counting

The paper used the APDL programming language to estimate fatigue life of the elastic chain flexible suspension catenary system.The basic steps for solving the life of the contact wire was also given.Improved rain-flow counting method was adopted to gain different stress amplitudes,stress averages and their corresponding stress cycles from the fatigue stress spectrum of each element on contact wire.Based on Miner linear cumulative damage theory,the fatigue life of contact wire elements was estimated.With the same parameters,the paper analyzed the factors affecting the fatigue life,including span,the pretension of contact wire and messenger wire,section areas,the train speed,the lifting force,dry friction and so on;compared the contact wire life based on the simple chain and elastic chain hanging;found out several key factors that affect current collection of catenary by comparing each group parameters.The conclusions provide an important basis for the design,construction and maintenance of the elastic chain flexible catenary system.