Under the disadvantage working conditions of wind load and cant deficiency,the running safety of high-speed trains displays complicated variation laws.Therefore,it is necessary to conduct in-depth research on the safety of curve negotiation of high-speed trains under wind load.Based on the combined analysis method of aerodynamics and vehicle dynamics,the transient wind load model,the aerodynamic model and the vehicle dynamics model of high-speed train under cross wind are established taking into account the changes in running speed,wind speed,the measured wheel rail profile,as well as the track irregularity.The variation laws of aerodynamic load of high-speed trains under different wind speed and running speed are analyzed.And the variation laws of key dynamics parameters of high-speed trains are studied when train negotiates large radius curves with different cant deficiency at different speeds,including derailment coefficient,wheel unloading ratio and wheelset lateral force.The influence of wind load and cant deficiency on the derailment and overturning of high-speed trains is studied.The results show that the change in lateral force coefficient caused by wind speed is greater than that of running speed;under the disadvantage working conditions of wind load and cant deficiency,the safety margin of vehicle dynamics performance will significantly decrease such as the wheel unloading ratio and wheelset lateral force.And the working condition of key suspension components of the high-speed train deteriorates,the displacement of secondary lateral stop increases rapidly and it is tightly compressed,the pressure difference between the left and right air springs also increases rapidly,and the safety margin of the vehicle's dynamic performance significantly decreases.
关键词
高速列车/风载/曲线通过性能/曲线欠超高/侧向力系数/脱轨系数/轮重减载率/轮轴横向力
Key words
High-speed trains/Wind load/Curve negotiation performance/Cant deficiency/Lateral force coefficient/Derailment coefficient/Wheel unloading ratio/Wheelset lateral force
维普
万方数据