摘要
为研究轮对摇头角对轮轨接触行为的影响以及评估简化非赫兹轮轨接触算法的精度,选取EKP、MKP与MSHM共3种考虑摇头角的轮轨非赫兹简化算法分析轮轨法向与切向接触行为。以S1002CN车轮踏面和CHN60钢轨为研究对象,以精确理论CONTACT算法的结果为参考,对比各简化接触算法得到的接触斑形状、接触应力、切应力等微观接触结果的准确性。利用UM软件建立车辆-轨道耦合动力学模型进行仿真分析得到轮轨运动参数,然后输入到接触算法计算轮轨接触解,基于统计学累积误差方法评估不同接触算法在实际车辆运行工况下的计算精度与稳定性。计算结果表明:摇头角使轮轨接触斑与接触应力呈三维非对称分布;对于法向接触,在大部分工况下,MKP算法相比EKP、MSHM算法精度较高,但接触斑内轮轨曲率变化较大时,如横移量为6 mm,MKP算法所得到的最大接触应力误差为47.2%,此时更适合采用MSHM算法,其误差为27%;对于切向问题,采用EKP+FaStrip、MKP+FaStrip算法比MSHM+FASTSIM算法得到的结果更准确;对于动力学结果,MKP+FaStrip算法比EKP+FaStrip、MSHM+FASTSIM算法得到的接触结果更加精确和稳定。
To investigate the influence of a yaw angle of wheelset on wheel-rail contact behaviors and assess the accuracy of fast non-Hertzian wheel-rail contact methods,three fast non-Hertzian methods considering the yaw angle were chosen:extended Kik-Piotrowski method(EKP),modified Kik-Piotrowski method(MKP)and modified semi-Hertzian method(MSHM)to analyze the normal and tangential contact behaviors between the wheel and rail.Based on the research objects of S1002CN wheel tread and CHN60 rail,and the reference results calculated by exact theory CONTACT,the accuracy of microscopic contact results including the shape of the contact patch,contact stress and shear stress calculated by fast non-Hertzian methods was compared.The vehicle-track coupled dynamic model was established by UM software to obtain the wheel-rail motion parameters in the simulation,as the input parameters of the wheel-rail contact models to calculate the wheel rail contact solution.Based on cumulative error method in statistics,the calculation accuracy and stability of different contact models were assessed under actual vehicle operating conditions.The results show that a yaw angle can result in the asymmetry of the contact patch and contact stress.For normal contact problems,the calculation accuracy of MKP is higher than that of EKP and MSHM in most contact conditions.However,when the curvatures between the wheel and rail contact patch vary significantly,in the case of a lateral displacement of 6 mm,the relative error of the maximum pressure calculated by MKP reaches 47%.Under this contact condition,MSHM has better estimation about the pressure,with relative error of 27%.For tangential contact problem,EKP+FaStrip and MKP+FaStrip methods have better accuracy than MSHM+FASTSIM.For dynamic simulation,MKP+FaStrip model has higher calculation accuracy and stability,because both EKP+FaStrip and MSHM+FASTSIM consider the wheel-rail curvatures which are usually discontinuous.
作者
陈雨
周佳仪
宋娟
安博洋
吕涛
王平
何庆
朱颖
CHEN Yu;ZHOU Jiayi;SONG Juan;AN Boyang;LYU Tao;WANG Ping;HE Qing;ZHU Ying(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Shandong Provincial Communications Planning and Design Institute Group Co.,Ltd.,Jinan 250101,China;SWJTU-Leeds Joint School,Southwest Jiaotong University,Chengdu 611756,China;China Railway Group Limited,Beijing 100039,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2024年第6期108-118,共11页
Journal of the China Railway Society
基金
国家自然科学基金(52108418,52108420)
四川省科技计划(2019YFG0460)。
关键词
轮轨接触
简化非赫兹接触算法
摇头角
计算精度
计算稳定性
wheel-rail contact
fast non-Hertzian contact model
yaw angle
calculation accuracy
calculation stability
