时速250km以上高速列车制动模式曲线算法

Braking mode curve arithmetic of high-speed train above 250 km·h-1

研究了时速250 km以上高速列车制动系统,分析了高速列车的运行阻力、制动力与制动距离。根据目标距离模式曲线理论,建立了高速列车的制动模式曲线分段迭代模型。应用MAT-LAB/Simulink软件,分析了CRH2-300型高速列车在平直道上、15‰与25‰直坡道上的运行阻力的变化,对比了CRH2-300型和CRH3型高速列车在制动初速为300 km.h-1时的常用和紧急制动曲线。计算结果表明:在平直道上,CRH2-300型高速列车紧急制动距离为2 786.68 m,CRH3型高速列车紧急制动距离为3 319.37 m,均满足紧急制动距离小于3 700 m的制动要求;仿真制动曲线和实际制动曲线基本一致,验证了分段迭代算法的有效性。

The braking system of high-speed train above 250 km·h-1 was studied,and the running resistance,braking force and braking distance of high-speed train were analyzed.Based on curve theory of target distance mode,the piecewise iteration model of braking mode curve for high-speed train was proposed.With MATLAB/Simulink software,the changes of running resistances on flat-straight line,direct ramp with grade 15‰ and direct ramp with grade 25‰ for CRH2-300 type high-speed train were analyzed,and the normal braking curves and emergency braking curves of CRH2-300 type and CRH3 type high-speed trains at initial braking speed 300 km·h-1 were compared.Calculation result indicates that the emergency braking distance of CRH2-300 type high-speed train is 2 786.68 m on direct ramp,the emergency braking distance of CRH3 type high-speed train is 3 319.37 m on direct ramp,and both of them are less than 3 700 m,which is the maximum braking distance of braking requirement.Simulation braking curves almost consistent with actual braking curves,which verifies the validity of piecewise iteration algorithm.1 tab,12 figs,10 refs.