期刊文献+

高速接触线动态疲劳可靠性研究 被引量:1

Investigation on Dynamic Fatigue Reliability of High-speed Contact Wires
下载PDF
导出
摘要 接触线在实际运营中长期受到受电弓的冲击,易发生疲劳破坏,对其疲劳可靠性分析具有重要意义,为解决实际统计数据匮乏的问题,提出了一种基于弓网动态仿真的接触线疲劳可靠性评估方法。采用威布尔分布来描述接触线的疲劳寿命,结合其S-N曲线,通过推导建立了接触线疲劳可靠性与使用寿命和应力循环的关系;基于模态分解法建立高速弓网动力学模型,计算接触线最薄弱单元的应力时程;利用雨流计数法统计出每个应力循环的均值和幅值,带入可靠性模型中,绘制接触线疲劳可靠性曲线,并研究了接触线预张力的变化对接触线可靠性的影响。算例中,当使用时间超过9年时,接触线疲劳可靠性将会低于0.98,预张力的增大会导致接触线可靠性的下降。 Contact wire is subjected to fatigue failure under the impact of the pantograph in real operation conditions. It is of great significant to analyze its fatigue reliability. In order to solve the problem of lacking actual data,this article proposes a method of evaluating the contact wire fatigue reliability based on pantograph-catenary dynamic simulation. Weibull distribution is adopted to describe the fatigue life of contact wire. The fatigue reliability expressed by working life and stress cycle is deduced with its S-N curve. The stress cycle of the weakest element is calculated by solving the high- speed pantograph-catenary equation at the basis of modal analysis method. The fatigue reliability curve is drawn by substituting the mean value and amplitude value of each stress cycle obtained by rain flow count method into the reliability model. And the influence of the pre- tension change on the fatigue reliability is studied. And the influence of the pre- tension change on the fatigue reliability is studied. For the numerical example,the fatigue reliability of the contact wire decreases to 0.98 after 9 years. The increase of the pre-tension will result in the loss of reliability.
出处 《机械科学与技术》 CSCD 北大核心 2016年第10期1618-1623,共6页 Mechanical Science and Technology for Aerospace Engineering
基金 国家自然科学基金项目(51007074)资助
关键词 接触线 疲劳寿命 疲劳可靠性 动态仿真 应力循环 模态分析 contact wire fatigue life fatigue reliability dynamic simulation stress cycle modal analysis
  • 相关文献

参考文献12

二级参考文献81

共引文献216

同被引文献21

引证文献1

二级引证文献1

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部