服役条件下的地铁天线梁疲劳损伤研究
陈东,邬平波
(西南交通大学 牵引动力国家重点实验室,四川 成都 610031)
摘要:以国内某型地铁天线梁结构为研究对象,建立了包含柔性体天线梁的刚柔耦合动力学模型,对实际线路以不同曲率半径曲线以及直线进行组合,并划分为四个阶段,以此模拟实际线路工况;基于车轮一个镟修周期内的四个阶段车轮径跳量跟踪测量数据,对镟修周期内的车轮多边形状态参数(阶数、幅值)进行区分,以此模拟车辆 服役条件下实际的车轮不圆状态。通过有限元软件ANSYS及动力学软件SIMPACK联合仿真得到天线梁动态应力历程,并依据AAR标准进行平均应力的修正,结合天线梁材料的S-N曲线,采用Miner疲劳损伤累积法将一个镟修周期内的损伤进行200万km全寿命里程下线性外推,获得全寿命里程下的天线梁疲劳损伤,仿真结果表明疲劳损伤不满足全寿命疲劳要求。同时,对天线梁在不同阶段动应力显著不同进行了分析,结果表明由车轮多边形产生的43~53 Hz激励传递到了天线梁,引起天线梁共振效应,故而第三、四阶段产生较大动应力。
关键词:天线梁;刚柔耦合;车轮不圆;应力历程;疲劳损伤;共振
中图分类号:O241.82 文献标志码:A doi:10.3969/j.issn.1006-0316.2019.02.001
文章编号:1006-0316 (2019) 02-0001-08
Research on Fatigue Damage of Metro Antenna Beam during Service
CHEN Dong,WU Pingbo
( State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China )
Abstract:The purpose of this paper is to examine the antenna beam structure of a domestic metro. The rigid-flexible dynamic model that contains the flexible structure of the antenna beam is established to simulate the actual working condition of the metro line. The actual metro line is divided into four stages, which is based on the different situations of the curves and straights. According to the data of the four stages continuously collected during the cycle of wheel re-profiling, the polygon-wheel situation is simulated with the polygonal shape parameters (order, amplitude) in wheelset turning. The dynamic stress time history of the antenna beam is measured with SIMPACK and ANSYS joint simulation, and the stress is modified referring to the standard of AAR. The fatigue damage is calculated by means of the S-N curves, and then the life-cycle fatigue damage of 2 million kilometer is available, which is evaluated by the linear extrapolation wheel turning period. The stress at different stages is obviously distinct, and the frequency of 43-53 Hz inspired by the polygon-wheel transmits to the antenna beam and inspires harmonious vibration of the antenna beam, which explains the more violent dynamic stress in the third and fourth stage.
Key words:antenna beam;rigid-flexible model;polygon wheel;stress time history;fatigue damage;harmonious vibration
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收稿日期:2018-08-21
基金项目:国家重点研发计划资助(2016YFB1200505);牵引动力国家重点实验室课题项目(2015TPL_Z03)
作者简介:陈东(1992-),男,湖北黄冈人,硕士研究生,主要研究方向为车辆系统疲劳强度。
 

 

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