摘要
重载铁路长大下坡道小曲线地段病害多发,是危及行车安全的风险源。以双机牵引30 t轴重万吨列车为研究对象,在考虑列车纵向冲动和曲线车辆动力学行为基础上,建立了长大列车动力学模型,分析了大轴重重载列车在常用全制动工况下长大坡道曲线参数设置对行车性能的影响。研究表明:重载列车在13‰下坡道500 m半径曲线地段制动时,整列车产生最大压钩力的车辆与曲线上出现最大车钩力的车辆并不一致,当曲线距头车初始制动位置距离700 m时,曲线段上第48节车车钩力达到最大值;制动产生的纵向冲动作用可使轮重减载率增大72%、倾覆系数增大47%、轮轨横向力增大41%、脱轨系数增大27%,这一作用会对行车安全性和轨道服役性能造成不利影响;从提高运营期行车安全、减缓曲线病害角度考虑,建议长大坡度最小曲线半径选取800 m。该研究可为重载铁路设计提供参考。
Diseases of heavy haul railway happen easily on a long steep down grad,these are a risk source being dangerous to train operation safety. A 30 t axle-load 10 000 t heavy haul train towed by two locomotives was taken as a study object,its dynamic model was established based on the train longitudinal impulse and vehicle dynamic behavior on curved tracks. The influences of curve parameters of a long steep ramp on train operation performance were analyzed during the heavy haul train passing through curve section of the long steep ramp under the full brake conditions. The results showed that the maximum hook force of the whole train is not consistent with that of the vehicle on the curve section when the heavy train is braked on the curve section with a radius of 500 m of the 13‰ down grade; the hook force of the48 th vehicle on the curve section reaches the maximum value when the curve section is 700 m far from the brake position of the head vehicle; the longitudinal impulse action caused by braking makes the wheel load reduction rate increase by72%,the overturning coefficient increase by 47%,the wheel-rail lateral force increase by 41% and the derailment coefficient increase by 27%; this action affects the train operation safety and the rail service performance; the minimum curve radius of the long steep downgrade is suggested to be 800 m to improve the operation safety and slow down diseases of curve sections. The study results provided a reference for the design of heavy haul railway.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第15期77-83,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51578054)
研究生创新基金(2016YJS100)
关键词
重载列车
纵向动力学
长大下坡
曲线
行车性能
heavy haul train
longitudinal dynamics
long steep down grade
curve
train operation performance
