不同轮对结构城市轻轨低地板列车通过道岔区动力学行为分析

Dynamic Behavior Analysis of Urban Light Rail Low Floor Train withDifferent Wheelset Passing Turnout Area

为研究城市轻轨低地板列车通过道岔区的动力学行为,选取典型的5模块M+F+T+F+M编组列车为研究对象。低地板列车轮对结构逐步从传统轮对发展为独立轮对,两者导向能力有较大差异,分别选取全传统轮对与全独立轮对列车进行研究,采用多体系统动力学方法,建立列车的动力学模型;采用轮轨多点接触理论,建立道岔的变截面轮轨接触模型。以7号单开道岔为例,分析全传统轮对列车与全独立轮对列车的头车、中间车和尾车通过道岔区的动力学行为。结果表明:通过道岔区比通过普通曲线更容易出现横向位移波动和接触点跳跃,轮轨力迅速增大;独立轮对通过道岔区比传统轮对横移量更大,更容易发生轮缘接触和偏磨;列车通过道岔区时,头车的轮轨横向力比中间车和尾车大,而尾车比头车和中间车更容易出现瞬间车轮跳起现象,中间车的安全性优于头车和尾车。

In order to study the dynamic behavior of the light rail vehicle passing through the turnout with small radius,select thetypical M+F+T+F+M 5 module train as the research object.The low-floor train gradually develops from the traditional wheelset tothe independent wheelset,but there is a big difference between the two steering abilities.The cases of all traditional wheel and all theindependently rotating wheels(IRWs)are selected.Establish the low-floor vehicle train model and the turnout model with variablecross-section based on the multi-points contact method and system dynamics method.Taking the China 7 th turnout as an example,analyse the dynamic behavior of the different vehicles,and compare the difference between the two cases.The results show that thereis more lateral displacement fluctuation and contact point jump compared with the ordinary curve when the train passing through theturnout,and the wheel-rail forces increase rapidly.The all IRWs vehicle has more flange contact and wheel partial wear comparedwith the all traditional wheels vehicle.Compared with the other vehicles’wheelset,the wheelset lateral force of the leading vehicle islarger,the wheelset of the tail vehicle has more wheel jump,and the wheelset of the middle vehicle is safer.