首页  |  期刊简介  |  期刊荣誉  |  编委会  |  现任主编  |  投稿指南  |  下载中心  |  期刊征订
中文核心期刊
Ei Compendex收录期刊
中国科学引文数据库来源期刊
中文科技期刊数据库收录期刊
国际刊号:1004-6801
国内刊号:32-1361/V
用户登录
  E-mail:  
  密  码:  
  作者 审稿  
  编辑 读者  
期刊向导
联系方式
  • 主管:中华人民共和国工业
              和信息化部
  • 主办:南京航空航天大学
              全国高校机械工程
              测试技术研究会
  • 国际刊号:1004-6801
  • 国内刊号:32-1361/V
  • 地址:南京市御道街29号
  • 电话:025-8489 3332
  • 传真:025-8489 3332
  • E-mail:qchen@nuaa.edu.cn
  • 邮编:210016
基于动应力时域外推的构架疲劳寿命评估方法
Fatigue Life Assessment Method of Frame Based on Time⁃Domain Extrapolation for Dynamic Stress
  
DOI:10.16450/j.cnki.issn.1004?6801.2021.04.019
中文关键词:  转向架构架  时域外推  疲劳  动应力  极值理论
英文关键词:bogie frame  time-domain extrapolation  fatigue  dynamic stress  extreme value theory
基金项目:国家自然科学基金资助项目(51805373)
作者单位
王秋实, 周劲松, 宫岛, 王腾飞, 孙煜, 尤泰文, 陈江雪, 张展飞 (同济大学铁道与城市轨道交通研究院 上海201804) 
摘要点击次数: 101
全文下载次数: 97
中文摘要:
      获取具有代表性的动应力时域信号是对车辆进行结构疲劳分析的重要前提,仅依靠短时间测试所得的动应力时域信号进行疲劳寿命评估,其结果并不能反应结构在较长时间历程,甚至是全寿命周期下的抗疲劳服役性能。以某动车组转向架转臂定位安装座焊缝附近的某测点为算例,提出了基于极值理论的动应力时域外推的疲劳寿命评估方法。首先,选取该测点在镟轮初、中、末期的3组动应力时域信号,对其进行前处理与等权重组合;其次,应用极值理论对组合样本信号进行尾部概率分布拟合,并对模型的拟合优度进行检验;然后,根据拟合的概率分布函数对动应力样本进行相应倍数的时域外推,获得长时载荷作用下的动应力时域信号;最后,采用外推后的动应力时域信号进行疲劳寿命评估。结果表明:相比于常用的线性外推方法,基于时域外推方法的疲劳损伤增加了0.168%,安全运营里程减少了2 670 km,评估更偏于安全。
英文摘要:
      Obtaining a representative dynamic stress time-domain signals is a prerequisite for structural fatigue analysis of vehicles. However, the fatigue life assessment results only depend on the dynamic stress time-domain signal obtained by a short-time test; it can not represent the anti-fatigue service performance of the structure in a long-time, even in the whole service life. Therefore, a fatigue life assessment method based on time-domain extrapolation of dynamic stress based on extreme theory is proposed for the first time. Taking a test point near the weld of the bogie arm positioning mounting seat of an electric multiple units (EMU) as an example, first, three groups of dynamic stress time-domain signals of the test point at the initial stage, middle stage, and the final stage of a whole wheel reprofile period are selected. The pre-processing and equal weight overlapping addition are carried out to them. Second, the tail probability distribution of the superimposed signal samples is fitted using the extreme value theory. The fitting goodness of the model is tested. Third, according to the fitting probability distribution function, the dynamic stress samples are extrapolated in the time domain to obtain the dynamic stress time-domain signal under long-term load; finally, the fatigue life of the test point is evaluated according to the extrapolated dynamic stress time-domain signal. The results show that: compared with the commonly used linear extrapolation method, the cumulative fatigue damage based on the time-domain extrapolation method increases by 0.168%, the safe operation mileage is reduced by 2 670 km, and the assessment is more safety.
查看全文  查看/发表评论  下载PDF阅读器
关闭

Copyright @2010-2015《振动、测试与诊断》

地址:南京市御道街29号        邮编:210016

电话:025-8489 3332      传真:025-8489 3332       E-mail:qchen@nuaa.edu.cn

您是本站第2628355位访问者 本站今日一共被访问189

技术支持:北京勤云科技发展有限公司