摘要
由于铁路系统的开放性,轮轨界面难以避免遭受第三介质(如水、油、雪等)的侵袭,轮轨蠕滑特性将因此改变。为研究轮轨蠕滑曲线对车辆-轨道动态相互作用的影响,首先,基于最小二乘法原理获得适用于Polach接触模型的参数,以模拟水介质条件下40~400 km/h行车速度范围内的实测轮轨蠕滑曲线;随后,采用SIMPACK多体动力学仿真软件建立车辆-轨道动力学模型,利用FASTSIM算法和Polach模型分别模拟理想条件与实测轮轨蠕滑曲线,以300 km/h运行速度为例,详细对比这两种蠕滑曲线条件下车辆-轨道动态相互作用的差异,并进一步分析运行速度的影响。研究表明:车辆运行速度为300 km/h时,实测轮轨蠕滑曲线对应的轮对横移量和轮对摇头角分别为干态工况结果的1.375倍和3.2倍,进而导致纵/横向蠕滑率明显大于干态工况结果;速度所致轮轨蠕滑曲线的差异对轮轨蠕滑力、脱轨系数以及磨耗指数影响较大,速度为160 km/h时尤为显著。因此,在进行车辆-轨道耦合动力学仿真分析时,有必要考虑实测的轮轨蠕滑曲线。
Due to the openness of railway system,it is difficult to avoid the invasion of the third medium(such as water,oil,snow,etc.)into the wheel-rail interface,which will change the wheel-rail creep characteristics.In order to study the influence of wheel-rail creep curve on vehicle-track dynamic interaction,this paper firstly obtains the parameters suitable for the Polach model based on the principle of least squares to simulate the actual measurement in the range of 40~400 km/h driving speed in water medium.Then,SIMPACK multi-body dynamics simulation software is used to establish the vehicle-track dynamics model.FASTSIM algorithm and Polach model are employed to simulate the ideal condition and the measured wheel-rail creep curve respectively.In the case of 300 km/h running speed,the differences of vehicle-track dynamic interaction under these two creep curves are compared in detail and the influence of running speed is further investigated.The results show that at the running speed of 300 km/h,the lateral movement and yaw angle corresponding to the measured wheel-rail creep curve are 1.375 and 3.2 times of those under dry conditions,which leads to greater longitudinal/lateral creepage.The difference of wheel-rail creep curve caused by speed has great influence on wheel-rail creep force,derailment coefficient and wear index,more significantly at the running speed of 160 km/h.Therefore,it is necessary to consider the measured wheel-rail creep curve in the simulation analysis of vehicle-track coupling dynamics.
作者
宋娟
王平
陈雨
安博洋
杨春凯
SONG Juan;WANG Ping;CHEN Yu;AN Boyang;YANG Chunkai(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2023年第6期45-52,共8页
Railway Standard Design
基金
国家自然科学基金项目(52108418,U1934214)
中央高校基本科研业务费理工科科技创新项目(2682021CX016)。
