基于实测载荷谱的CED420型高速受电弓疲劳强度评估  

Fatigue Strength Evaluation of CED420 High-speed Pantograph Based on Measured Load Spectrum

作　　者：黄思俊 袁骞 吴楠 赵志远 贾荣 HUANG Sijun;YUAN Qian;WU Nan;ZHAO Zhiyuan;JIA Rong(Beijing CRRC CED Railway Electric Tech.Co.,Ltd.,Beijing 100176,China)

机构地区：[1]北京中车赛德铁道电气科技有限公司,北京100176

出　　处：《铁道机车车辆》2024年第3期119-124,共6页Railway Locomotive & Car

基　　金：大连市科技创新基金计划(2019J11CY017)。

摘　　要：针对CED420型高速受电弓疲劳破坏问题,提出了基于实测载荷谱的受电弓疲劳强度评估方法。根据CED420型高速受电弓三维实体模型,建立有限元数值模拟模型。基于雨流计数法分析线路实测的垂向弓网接触力载荷谱,同时通过流体力学软件计算受电弓各部位所承受的空气动力。在此基础上,对有限元模型进行疲劳工况加载,通过ANSYS软件计算CED420型高速受电弓的应力变化范围。最后基于IIW疲劳评估标准,对受电弓钢材结构和铝材结构进行疲劳强度评估并分析原因。结果表明受电弓各部位疲劳累积损伤均小于1,满足设计要求,其中钢材结构薄弱部位发生在上臂,最大累积损伤为0.64,铝材结构薄弱部位发生在受电弓弓头铝托部位,最大累积损伤为0.72。Aiming at the fatigue failure of the CED420 high-speed pantograph,a method for evaluating the fatigue strength of the pantograph is proposed based on the measured load spectrum.According to the three-dimensional solid model of the new pantograph,a finite element numerical simulation model is established.Based on the rain flow counting method,the measured vertical pantographcaten contact force load spectrum was analyzed,and the aerodynamic force on each part of the pantograph was calculated by the fluid mechanics software.On this basis,the finite element model is loaded under fatigue conditions,and the stress variation range of the new pantograph is calculated by ANSYS software.Based on the IIW fatigue evaluation standard,the fatigue strength of the new pantograph steel structure and aluminum structure were evaluated and the reasons were analyzed.The results show that the cumulative damage is less than 1,which meets the design requirements.The weak part of the steel structure occurs in the upper arm,and the maximum cumulative damage is 0.64;the weak part of the aluminum structure occurs in the aluminum bracket of pantograph head,and the maximum cumulative damage is 0.72.

关 键 词：CED420型受电弓 疲劳强度评估 弓网接触力 疲劳累积损伤 

分 类 号：U264.34[机械工程—车辆工程]