摘要
通过建立轮轨三维几何接触模型、整车动力学分析模型和轮轨碰撞模型,分析高速铁道车辆蛇行失稳后的蛇行脱轨过程及其影响因素。高速铁道车辆的蛇行脱轨过程是一个爬轨和跳轨并存的复杂过程,轮对的名义冲角和有效冲角分别对准静态的爬轨和动态的跳轨起着重要影响作用;随着轮对横移速度的增大、轮轨摩擦系数以及车轮垂向载荷的减小,车轮的跳轨高度越大;横向蠕滑力在整个蠕滑力中所占比例以及轮对横向运动能量越大,车辆越容易脱轨。因此高速铁道车辆的蛇行脱轨安全性应根据轮对横移速度限值并考虑车辆的横向运行稳定性进行评判。当高速铁道车辆分别表现为"超临界"和"亚临界"的蛇行失稳极限环分岔形式时,可分别采用转向架横向加速度移动均方根值方法和转向架横向加速度限值对其横向运行稳定性进行评判。
A three-dimensional wheel-rail geometry contact model, a vehicle dynamic analysis model and a wheel-rail impact model are established and combined to investigate the dynamic derailment process of high speed railway vehicle and its influencing factors after the vehicle loses the running stability. In the process of hunting derailment, flange climb derailment and jumping derailment coexist, the nominal angle of attack plays an important role in the process of quasi-static flange climb derailment, whereas the effective angle of attack greatly affects the dynamic jumping derailment. With the increase of wheelset lateral velocity, the decrease of wheel rail friction coefficient and wheel vertical load, the wheel jump height will increase. The greater the proportion of lateral creep force in the whole creep force and wheelset lateral movement energy, the more likely vehicle derailment. Thus for the evaluation of the hunting derailment safety of high speed railway vehicle, both the wheelset lateral velocity limit values and vehicle lateral running stability should be taken into account. When high speed railway vehicle system shows a supercritical Hopf bifurcation, the moveable RMS value of bogie lateral acceleration is proposed to evaluate the lateral running stability. However, when it shows a subcritical Hopf bifurcation, the bogie lateral acceleration limit value is recom- mended for the evaluation of the lateral running stability.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2013年第5期82-92,共11页
China Railway Science
基金
铁道部科技研究开发计划项目(1219YF1305,1334YF2705)
关键词
高速车辆
蛇行脱轨
评判指标
轮轨接触
High speed railway vehicle
Hunting derailment
Evaluation index
Wheel-rail contact
