基于名义应力法的动车组车体净水箱吊装部件疲劳强度分析  

Fatigue Strength Analysis of Water Tank Suspension Components of Electric Multiple Units based on Nominal Stress Method

作　　者：马纪军[1] 杨帅[1] 于金朋[1] 宿崇[2] 

机构地区：[1]中国北车集团唐山轨道客车有限责任公司,河北唐山063000 [2]大连交通大学机械工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2015年第4期18-21,共4页Journal of Dalian Jiaotong University

基　　金：辽宁省教育厅高等学校科学研究计划资助项目(L2013181);中国博士后科学基金资助项目(2013moyu.com30901)

摘　　要：针对高速运行动车组车体悬挂设备振动疲劳损伤问题,以某型动车组车顶净水箱吊装结构为研究对象,采用名义应力法对吊装结构的焊缝部位进行疲劳强度评估.根据EN 12663标准确定净水箱的工作载荷工况,采用有限元法计算了各工况下结构的振动响应,并基于BS标准计算了焊缝疲劳评估点的寿命.假定各载荷工况出现频率相同的情况下,构造了工作载荷历程,采用Fe-safe软件对焊缝的疲劳寿命进行了仿真分析.两种方法分析结果均表明:焊缝1与焊缝2寿命最低,是结构最易发生疲劳破坏的位置;焊缝位于筋板表面的焊趾寿命低于位于主支撑板表面的焊趾寿命.For researching the vibration fatigue characteristics of train body suspension equipments of electric multiple units,the fatigue strength of the suspension components weld seams of train body water tank of EMU was analyzed by nominal stress method. The work loads of water tank were defined according to EN 12663 standard. The vibration response of the water tank suspension components was commutated by finite element method. The fatigue lifes of the assessment points of weld seams were calculated based on BS standard. The load time histories were constructed under considering the same appearing frequency of the work loads. The fatigue lifes of the weld seams were simulated by Fe-safe software. The analysis results show that the fatigue lifes of weld seam one and weld seam two are lower than the other weld seams. They are the weak regions of the whole structure. The fatigue lifes of weld toes located on bracing sheet are lower than the ones of weld toes located on the host bearing sheet.

关 键 词：动车组 吊装结构 疲劳评估 名义应力法 BS标准 

分 类 号：U260.32[机械工程—车辆工程]