轮轨界面低黏着对大功率电力机车车轮滚动接触疲劳的影响  

Effect of Low Adhesion Between Wheel and Rail on Wheel Rolling Contact Fatigue of High-power AC Locomotives

作　　者：刘永锋 赵旭峰 栗杨 温泽峰[1] 赵鑫[1] LIU Yongfeng;ZHAO Xufeng;LI Yang;WEN Zefeng;ZHAO Xin(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;Technology Center,Zhuzhou CRRC Times Electric Co.,Ltd.,Zhuzhou 412001,China)

机构地区：[1]西南交通大学牵引动力国家重点实验室,四川成都610031 [2]株洲中车时代电气股份有限公司轨道交通技术中心,湖南株洲412001

出　　处：《铁道学报》2022年第12期22-29,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(51875484)。

摘　　要：大功率电力机车在日常运营中不可避免遇到轨面局部低黏着(摩擦系数小于黏着需求)现象,为研究该现象对机车车轮名义滚动圆附近萌生的第3类滚动接触疲劳(简称“RCF3”)的影响,基于多体动力学仿真软件Simpack建立机车动力学模型,利用损伤函数预测轨面有局部低黏着时车轮的裂纹萌生速率。结果表明,直线下坡电制时,仅单侧轨面的低黏着能增大两侧车轮RCF3的萌生速率;曲线下坡电制时,仅单侧轨面的低黏着可增大另一侧车轮RCF3的萌生速率。双侧轨面均有低黏着时,RCF3萌生速率随低黏着区长度的增大而先增加后下降,直至磨耗主导。当轨面低黏着区长度小于车轮周长时,可导致RCF3仅在车轮局部萌生或萌生速率沿周向分布不均。In the day-to-day running of high-power AC locomotives,the phenomenon of local low adhesion(LAZ,friction coefficient is less than adhesion demand)on the rail surface is inevitable.In order to study the effect of this phenomenon on the third rolling contact fatigue(RCF3)initiated near the nominal rolling circle of wheels,a multi-body dynamics model of the locomotive was established using Simpack software,based on the damage function,to assess the influence of LAZ in the local rail surface where the friction coefficient is less than adhesion demand on initiation rate of RCF3.The results show that the RCF3 initiation of wheels of a wheel-set can be aggravated by LAZ on only one side of the rail surface when the locomotive under the braking runs on the tangential downhill tracks.When the locomotive runs on the curves with the downhill slopes,the RCF3 initiation of wheels contacted on the one rail will be aggravated by LAZ on the other rail surface.The RCF3 initiation rate first increases before decreasing with an increase of length of LAZ on both sides of the rail surfaces,finally till the wear dominates.The less length of LAZ than the wheel circumference may cause the RCF3 initiation in the local position of the wheel or uneven distribution of the RCF3 initiation along wheel circumference.

关 键 词：电力机车 滚动接触疲劳 低黏着 多体动力学 损伤函数 

分 类 号：U211.5[交通运输工程—道路与铁道工程]