高速动车组车轴动应力计算及可靠性分析  

Dynamic Stress Calculation and Analysis Reliability of the Axle of High-speed EMU

作　　者：吴丹[1] 丁旺才[1] 郭富强[2] WU Dan;DING Wang-cai;GUO Fu-qiang(School of Mechatronic Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Technology Center of Chengdu EMU Depot,Chengdu Railway Bureau,Chengdu 610051,China)

机构地区：[1]兰州交通大学机电工程学院,甘肃兰州730070 [2]成都铁路局成都动车段技术中心,四川成都610051

出　　处：《兰州交通大学学报》2018年第6期76-80,共5页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(11462011);兰州交通大学青年基金(2017014)

摘　　要：为研究高速动车组车轴的疲劳可靠性,基于TB/T 3352-2014不平顺轨道谱,利用UM建立整车刚柔耦合动力学模型,分析得到轮轨动力学响应,通过雨流计数法统计作用于轮轴上的8级载荷谱,结合ANSYS通过准静态法求得车轴动应力,利用Miner理论和修正的Paris公式计算出车轴疲劳寿命,最后基于三参数威布尔分布分析了不同可靠度下的车轴疲劳寿命.结果表明:轮座内侧圆弧过渡处最薄弱,可靠度为0. 9时,其寿命约为28. 84年.该方法将传统有限元强度分析方法和动力学仿真方法相结合,使分析结果更准确.In order to study the fatigue reliability of high speed EMU axle,this paper obtains the wheel rail dynamic response based on the TB/T 3352-2014 irregular track spectrum,and the rigid-flexible coupling dynamic model of the whole vehicle is established by using UM.The load spectrum of eight grades acting on the axle has been calculated by using the rain flow counting method.The dynamic stress of the axle is obtained by the implementation of the quasi-static method of ANSYS.The fatigue life of the axle is explored by using the Miner theory and the modified Paris formula.Finally,the fatigue life of axle under different reliability is analyzed based on three-parameter Weibull distribution.The results show that the inner arc transition is the weakest and the reliability is 0.9 and its life span is about 28.84 years.This method combines the traditional finite element strength analysis method with the dynamic simulation method to make the analysis results more accurate.

关 键 词：车轴 载荷谱 动应力 威布尔分布 疲劳寿命 

分 类 号：U260.111[机械工程—车辆工程]