自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第51卷    第9期    总第313期    2020年9月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2020)09-2653-10
城际动车组车轮I类滚动接触疲劳机理研究
蔡宇天,赵鑫,陈佳明,刘永锋,温泽峰

(西南交通大学 牵引动力国家重点实验室,四川 成都,610031)

摘 要: 针对我国200 km/h城际动车组车轮发生的I类滚动接触疲劳,对16列动车组及4个不同半径曲线轨道进行轮轨状态现场观测。基于多体动力学软件SIMPACK和损伤函数模型,建立车轮滚动接触疲劳预测模型,系统分析城际动车组的车轮I类疲劳损伤。研究结果表明:早期时动车组不调头运行,I类疲劳在运行(6~9)万km即出现,集中在左侧车轮,其疲劳区最初位于名义滚动圆外侧5~15 mm处,之后略有扩大并向踏面外侧移动;曲线通过时的低轨侧轮轨相互作用是导致I类疲劳的根本原因,当半径R大于400 m时,预测的疲劳寿命随半径的增加而增加;所运行线路上小半径曲线(R≤450 m)全为左曲线,导致早期不调头I类疲劳集中在左轮,定期调头后,两侧车轮交替承受疲劳载荷;现场中轮轨廓形演化和轨底坡误差等是I类疲劳区扩大和向外侧移动的直接原因。

 

关键字: 城际动车组;滚动接触疲劳;车辆动力学;损伤函数;小半径曲线

Study on initiation mechanism of rolling contactfatigue Class I on intercity EMU wheels
CAI Yutian, ZHAO Xin, CHEN Jiaming, LIU Yongfeng, WEN Zefeng

State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China

Abstract:To reveal the initiation mechanism of class I rolling contact fatigue(RCF) occurring on wheels of a type of Chinese intercity electric multiple units(EMU) with a designed speed of 200 km/h, field observations and measurements covering 16 EMUs and 4 curves were conducted. With a dynamic model developed in SIMPACK and embedded with the damage function model, the class I RCF of intercity EMU was systematically predicted. The results show that the RCF occurred at a distance of 60 000-90 000 km and mainly on the left wheels at early stages when the EMUs run back and forth without turning around. The fatigued zone was initially 5-15 mm outside the nominal rolling circle, and laterally expanded in coverage and moved outward with the mileage. The root cause of the RCF is the wheel-rail interaction on the low rails of curves, and the simulated fatigue life increases with the radius of curvature when the radius(R) is greater than 400 m. The fact that sharp curves (R ≤ 450 m) on the line are all left ones resulted in the occurrence of the RCF on the left wheels before periodic turning around. After that, wheels of both sides bear the fatigue load alternately. The observed expansion and outward movement of the fatigued zone are due to the evolution of wheel-rail profiles and the error of the rail cant.

 

Key words: Intercity electric multiple units; rolling contact fatigue; vehicle dynamics; damage function; sharp curves

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号