动车组动力车减振器座及焊缝疲劳寿命评估  

Fatigue Life Assessment of Vibration Damper Base and Weld in EMU Power Trains

作　　者：杨帆 柴学彬 高翔 张昭[2] YANG Fan;CHAI Xuebin;GAO Xiang;ZHANG Zhao(Department of Locomotive Development,CRRC Dalian Co.,Ltd.,Dalian Liaoning 116022,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian Liaoning 116024,China)

机构地区：[1]中车大连机车车辆有限公司机车开发部,辽宁大连116022 [2]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024

出　　处：《中国铁道科学》2022年第4期113-120,共8页China Railway Science

基　　金：辽宁省自然科学基金资助项目(2019KF0507)。

摘　　要：针对某型号动力集中式动车组动力车横向减振器座及焊缝,进行静强度分析和全寿命里程计算;提出基于应变片测量位置处位移变化的方法,计算有限元模型中试验测量点的应力,以避免有限元计算中固有的应力网格敏感性问题,并通过试验与数值计算结果的对比,验证静强度分析计算模型中基于位移变化的方法计算测量点应力的合理性;基于Palmgram-Miner累积损伤准则,计算实测载荷谱下该型号动力车横向减振器座及焊缝的疲劳累积损伤和全寿命里程。结果表明:减振器载荷采用16级分级载荷谱编制时,4—11级载荷所造成的结构损伤百分比达到93.35%,是造成结构损伤累积的主要原因;相同载荷谱作用下,减振器座焊缝的结构损伤百分比远高于母材区域,是它的2.39倍;通过全寿命周期疲劳寿命预测方法验证了减振器座及其焊缝满足900万km的安全运行要求。Based on the lateral vibration damper base and weld of a power-concentrated EMU power train,the static strength analysis and the total life mileage calculation are carried out.Displacement variation at the measured position of strain gauge is used to calculate stresses at the experimental measurement points to avoid mesh sensitivity of stresses previously occurred in finite element models.The results of the experiment and numerical calculations are compared to validate the rationality of the above proposed method.Based on the Palmgram-Miner accumulative damage rule,the accumulative fatigue damage and the total life mileage for the lateral vibration damper base and the weld of the power train are calculated under the measured load spectrum.The results indicate that the 4-11 stage load leads up to 93.35%of the structural damage in the case of applying the 16-stage load spectrum in the compilation of the vibration damper load.It is the key reason for the structural damage accumulation.Under the same load spectrum,the structural damage of the weld of vibration damper base is 2.39 times higher than that of the base material area.Through the total-life cycle fatigue life prediction method,the vibration damper base and its weld meet the requirements for the safety operation of 9 million kilometer.

关 键 词：动力集中式 动车组动力车 减振器座 焊缝 累积损伤 疲劳寿命 

分 类 号：U266.2[机械工程—车辆工程]