接触线风振疲劳可靠性分析

摘要

对新疆兰新线百里风区平均风速概率分布进行了统计分析，并应用谐波叠加法计算了该地区的脉动风速时程，建立了接触网支持结构和悬挂结构耦合的接触网有限元模型，通过有限元分析、雨流法技术获得了接触网结构特征点处的疲劳应力谱。提出了基于最大平均风速分布函数、疲劳应力谱和Palmgren—Miner线性疲劳累积损伤准则的风振疲劳可靠度计算方法。并基于此方法分析了跨距对接触网疲劳可靠性的影响。结果表明：新疆兰新线百里风区平均风速近似服从形状参数为2．5、尺度参数为16．2的威布尔分布；随着跨距的增加，接触线的疲劳可靠度与时间的关系曲线下降的比较缓慢，减少接触线的跨距有利于提高接触线的疲劳使用寿命。%To get the fatigue stress spectrum through the contact wire stress time history, a statistical analysis of the average wind speed probability distribution of Hundred-Miles Wind Area at Lanchow-Sinkiang railway is made, and a multivariable simulation model of stochastic wind field based on the spectral representation method is proposed, and a finite element model of a segment eatenary of the strong wind area in Xinjiang is built up by the finite element program ANSYS, which consists of hanging structures and support structures. To research the fatigue reliability of contact wire under wind load, a fatigue reliability calculation method is proposed, which base on the maximum average wind speed distribution function, fatigue stress spectrum and Palmgren-Miner linear cumulative fatigue damage criterion. The results show that the average wind speed probability distribution of Hundred-Miles Area at Lanchow-Sinkiang railway obey Weibull distribution which shape parameter is 2.5 and scale parameter is 16.2 ; the fatigue reliability of contact wire under wind load can be improved in evidence by decreasing catenary span.