• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (10): 152-159.doi: 10.3901/JME.2022.10.152

• 运载工程 • 上一篇    下一篇

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高速列车齿轮箱动应力分布特性研究

杨广雪1, 安钱钱1, 李爽1, 张子璠2, 李广全2, 李国顺3, 陈璨3   

  1. 1. 北京交通大学机械与电子控制工程学院 北京 100044;
    2. 中车青岛四方机车车辆股份有限公司 青岛 266111;
    3. 中国铁道科学研究院集团有限公司机车车辆研究所 北京 100081
  • 收稿日期:2021-06-03 修回日期:2021-09-08 出版日期:2022-05-20 发布日期:2022-07-07
  • 通讯作者: 杨广雪(通信作者),男,1982年出生,副教授。主要研究方向为结构强度可靠性。E-mail:gxyang@bjtu.edu.cn
  • 基金资助:
    国家自然科学基金(12072020)和国家重点研发计划(2018YFB1201704)资助项目。

Research on Dynamic Stress Distribution Characteristics of High Speed Train Gearbox

YANG Guangxue1, AN Qianqian1, LI Shuang1, ZHANG Zifan2, LI Guangquan2, LI Guoshun3, CHEN Can3   

  1. 1. School of Mechanical, Electronic and Control Engieering, Beijing Jiaotong University, Beijing 100044;
    2. CRRC Qingdao, Sifang Co., Ltd., Qingdao 266111;
    3. Locomotive&Car Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081
  • Received:2021-06-03 Revised:2021-09-08 Online:2022-05-20 Published:2022-07-07

摘要: 通过在标准动车组齿轮箱关键部位布置应变传感器获得齿轮箱动应力时间历程曲线,结合GPS信号分析高、低速直线运行,牵引状态变化和转矩波动工况下齿轮箱动应力的变化规律。利用雨流计数法统计齿轮箱动应力幅值,并采用核密度估计函数和威布尔分布函数对其进行拟合分析。在此基础上提出组合分布函数来推断动应力最大值并编制动应力扩展谱,最后根据Miner线性累积损伤理论得到不同应力等级对齿轮箱疲劳损伤的贡献量。结果表明,列车运行速度、电机输出转矩对齿轮箱动应力幅值均有不同程度的影响;依据基于核密度函数和威布尔分布函数提出的组合分布函数,求解得到齿轮箱端部动应力最大值为25.43 MPa;根据采用组合分布概率密度函数编制的齿轮箱动应力扩展谱,得到齿轮箱端部在9~17 MPa的应力所产生的疲劳损伤比重约占全部损伤的71.3%,因此在齿轮箱疲劳损伤评估时应关注结构中作用频次高的应力幅值,避免齿轮箱结构的早期疲劳失效。

关键词: 动车组, 齿轮箱, 动应力, 累积损伤, 组合分布

Abstract: Dynamic stress-time curves of gearbox is obtained by arranging strain sensors at key parts of gearbox of standard EMU. Combined with GPS signal, variation law of dynamic stress of gearbox under high and low speed running on straight line, traction state change and torque fluctuation conditions are analyzed. Dynamic stress amplitude of gearbox is calculated by rain flow counting method, and fitting analysis is carried out by kernel density estimation function and Weibull distribution function. On this basis, a combined distribution function is proposed to infer the maximum dynamic stress, and dynamic stress expansion spectrum is compiled. Finally, according to Miner linear cumulative damage theory, contribution of different stress levels to fatigue damage of gearbox is obtained. The results show that train speed and motor output torque have different effects on dynamic stress amplitude of gearbox. According to the proposed combined distribution function based on kernel density function and Weibull distribution function, maximum dynamic stress at the end of gearbox is 25.43 MPa. Based on dynamic stress expansion spectrum of gearbox prepared by the combined distribution probability density function, fatigue damage caused by stress at the end of gearbox at 9-17 MPa accounts for about 71.3% of total damage. Therefore, in fatigue damage assessment of gearbox, attention should be paid to stress amplitude with high frequency of action in structure to avoid early fatigue failure of gearbox structure.

Key words: EMU, gearbox, dynamic stress, cumulative damage, combination distribution

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