摘要
高速列车车轮多边形磨耗会引起轮轨作用力明显增大,对车辆和轨道部件产生恶劣影响。为研究车轮多边形对轨道所承受载荷的影响,探索更高速度等级高速铁路轨道设计载荷的确定方法,本文建立了详细的车辆-轨道耦合模型,仿真分析了不同车速20阶车轮多边形下的轮轨动力响应,计算了轮轨垂向力及扣件垂向力的特征。结果表明:(1)车轮多边形对轨道结构作用为谐波激励,激励空间波长与车轮多边形波长相同,随着运行速度的增加,多边形激励频率随之增加,对轨道结构形成扫频作用,在某一共振速度下出现峰值;(2)轮轨力最大值受不圆幅值影响显著,其最大值随车轮多边形幅值增加而增大。不圆幅值为0.02 mm时,轮轨力最大值为149 kN;幅值为0.1 mm时,轮轨力最大值为291 kN;400 km/h速度条件下,车轮多边形幅值在0.01~0.1 mm范围内时,对应的轮轨力与静轮重比值为1.69~4.16;(3)400 km/h速度条件下,车轮多边形幅值在0.01~0.1 mm范围内变化时,扣件力最大值的变化范围为21.89~31.49 kN,对应的动静力比值为1.11~1.59。
The polygonal wear of high-speed train wheels will cause significant increase of the wheel-rail force,which will have an adverse impact on vehicles and track components.In order to study the impact of polygonal wheels on the load on tracks and explore the method of determining the design load of high-speed railway track with higher design speed,a detailed vehicle-track coupling model is established in this paper,and the dynamic response of wheel-track under 20-order polygonal wheels at different speeds is simulated and analyzed,and the characteristics of wheel-track vertical force and fastener vertical force are calculated.The results show that:(1)The effect of the polygonal wheel on the track structure is harmonic excitation,and the excitation space wavelength is the same as that of the polygonal wheel.With the increase of running speed,the polygon excitation frequency increases,which forms a sweep frequency effect on the track structure,and reaches the peak at a certain resonance speed.(2)The maximum value of wheel-rail force is significantly affected by the out-of-round amplitude,and its maximum value increases with the increase of the amplitude of the polygonal wheel;specifically,the maximum wheel-rail force is 149 kN when the out-of-round amplitude is 0.02 mm,and 291 kN when the amplitude is 0.1 mm;and the ratio of wheel-rail force to dead wheel weight is 1.69~4.16 when the amplitude of the polygonal wheel is in the range of 0.01~0.1 mm at the speed of 400 km/h.(3)The maximum value of fastener force changes within the range of 21.89~31.49 kN when the amplitude of the polygonal wheel changes within the range of 0.01~0.1 mm at the speed of 400 km/h,and the corresponding ratio of dynamic and static forces is 1.11~1.59.
作者
李忠继
陈志贤
姚力
杨吉忠
林红松
LI Zhongji;CHEN Zhixian;YAO Li;YANG Jizhong;LIN Hongsong(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《高速铁路技术》
2021年第5期73-78,共6页
High Speed Railway Technology
基金
中铁二院工程集团有限责任公司科技开发计划(KNSQ202059)。
关键词
高速列车
车轮多边形磨耗
轮轨力
扣件力
动载系数
high-speed train
polygonal wheel wear
wheel-rail force
fastener force
dynamic load coefficient
