摘要
本文采用多体动力学软件建立了考虑轨道及扣件系统车辆-轨道耦合模型,分析了不同扁疤模型、不同扁疤长度、不同车速下的车轨动力响应,结果表明:(1)对于二维扁疤模型,随着车速的增加,轮轨冲击速度先增大后减小,之后基本保持不变,产生最大冲击速度的临界车辆速度约为20 km/h;(2)对于二维和三维扁疤模型,随着车轮扁疤长度的增加,轮轨冲击速度、轮轨垂向力基本呈线性增大;(3)相同扁疤长度下,随着车速的增加,轮轨垂向力及扣件垂向力先增大后减小,并且在车速10~50 km/h范围内存在峰值,该峰值与扁疤二维模型仿真结果相对应,但是在速度较高情况下(150~200 km/h)还会出现一个峰值,且此峰值为轮轨垂向力及扣件垂向力最大值出现位置;(4)在扁疤长度为70 mm时的轮轨垂向力最大值及轮轨垂向力与静轮重比值均明显较大,必须以标准、规范等文件对扁疤长度进行限制。
In this paper, a vehicle-track coupling model considering track and fastening system is established by using multi-body dynamics software, and the dynamic responses of wheel-rail under different tread flat models, different tread flat length and different train speeds are analyzed. The results show that:(1) For the two-dimensional tread flat model, with the increase of train speed, the wheel-rail impact speed increases first and then decreases, and then basically remains unchanged. The critical train speed generating the maximum impact speed is about 20 km/h.(2) For the two-dimensional and three-dimensional tread flat models, with the increase of the length of the tread flat, the wheel-rail impact speed and the wheel-rail vertical force basically increase linearly.(3) Under the same length of tread flat, with the increase of train speed, the wheel-rail vertical force and the fastening vertical force increase first and then decrease, and there is a peak in the train speed range of 10~50 km/h, and this peak corresponds to the simulation results of two-dimensional tread flat model. In addition, there will be another peak at high speed(150~200 km/h), and this peak appears when the wheel-rail vertical force and fastening vertical force reach the maximum values.(4) When the length of the tread flat is 70 mm, the maximum wheel-rail vertical force and the ratio of wheel-rail vertical force to static wheel load are obviously larger, so the length of the tread flat must be specified by standards, specifications and other documents.
作者
陈志贤
林红松
姚力
杨吉忠
李忠继
CHEN Zhixian;LIN Hongsong;YAO Li;YANG Jizhong;LI Zhongji(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《高速铁路技术》
2022年第4期47-54,共8页
High Speed Railway Technology
基金
中铁二院工程集团有限责任公司科技发展计划项目(KSNQ202059)。
关键词
高速列车
扁疤
轮轨动力响应
high-speed train
tread flat
wheel-rail dynamic response
