中国机械工程

• 机械基础工程 • 上一篇    下一篇

高速铁路接触网吊弦动应力数值模拟及其疲劳荷载特征分析

戚广枫1;赵慧1;肖晓晖1;徐鸿燕2;李红梅2   

  1. 1.武汉大学动力与机械学院,武汉,430072
    2.中铁第四勘察设计院集团有限公司,武汉,430072
  • 出版日期:2018-05-10 发布日期:2018-05-09
  • 基金资助:
    国家自然科学基金资助项目(51175383)
    National Natural Science Foundation of China(No. 51175383)

Numerical Simulation of Dynamic Stress and Analysis of Fatigue Load Characteristics for High-speed Railway Catenary Droppers

QI Guangfeng1;ZHAO Hui1;XIAO Xiaohui1;XU Hongyan2;LI Hongmei2   

  1. 1.School of Power and Mechanical Engineering, Wuhan University, Wuhan,430072
    2.China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan,430072
  • Online:2018-05-10 Published:2018-05-09
  • Supported by:
    National Natural Science Foundation of China(No. 51175383)

摘要: 建立高速铁路弓网系统的有限元模型并进行动态仿真计算,分析了受电弓以300 km/h速度通过时,选定跨段各吊弦的力时程曲线的特点;对双弓250 km/h、300 km/h工况下的静态力和最大吊弦力进行分析,得到了双弓300 km/h工况下吊弦振动时的最大吊弦力最大可达双弓250 km/h工况下的2倍的结论。用雨流计数法对吊弦的应力时程进行统计计数,得到了包含各吊弦的各级应力幅值、应力均值和应力循环次数的应力统计谱。用Goodman直线对雨流计数得到的应力统计谱进行零均值应力转换,从而获得用于试验加载和寿命预测的疲劳载荷谱。研究结果表明:在同一车速下,安装位置越靠近跨段中点,吊弦越容易发生疲劳断裂;对跨中吊弦而言,沿行车方向先经过的吊弦对车速更为敏感,且车速高于300 km/h时发生疲劳断裂的概率更高。

关键词: 弓网系统, 吊弦, 疲劳载荷谱, 雨流计数法, Goodman直线

Abstract: The finite model of a high-speed railway pantograph-catenary system was established to perform the dynamic simulation,then features of the droppers’ force history curves in a selected span were analyzed when the pantograph passed through at a speed of 300 km/h.Static dropper forces and maximum dropper forces under the conditions of 250 km/h and 300 km/h were analyzed respectively when the train was running with dual pantographs,then the results were gained that the maximum dropper forces of the dropper vibration of 300 km/h may be up to 2.0 times larger than that of 250 km/h at most.Stress histories of the dropper were counted by the rainflow counting method to obtain stress statistics spectrum,which consisted of stress amplitudes,stress mean and stress cycles.Using the Goodman line method,zero-mean stress conversion of the stress statistics spectrum obtained by the rainflow counting method was performed to acquire the fatigue load spectrum,which could be used for test loading and life prediction.The research results show that for the same running speed,droppers closer to the midspan are more easily to produce fatigue fractures;in terms of the midspan droppers,droppers which are passed firstly along the driving direction are more sensitive to speed, and their fatigue fractures probabilities are much higher when the running speed is higher than 300 km/h.

Key words: pantograph-catenary system, dropper, fatigue load spectrum, rainflow counting method, Goodman line

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