高速铁路列车制动曲线计算精确度与效率分析

Accuracy and efficiency analysis of braking curve calculation for high-speed railway train

在高速铁路列车控制系统中,车载设备依据行车许可、线路数据和列车制动参数计算目标距离连续速度控制模式曲线,对列车位置和速度进行实时监控,保证列车安全、高效运行。在不同速度下,高速铁路列车具有不同的制动能力。在现有的高速列车控制系统中,对速度进行有限数量分段,分段内采用固定减速度,以较少速度分段计算速度监控曲线。如何对列车速度进行分段并确定分段内制动减速度,将直接影响高速铁路列车车载设备计算制动曲线的精确度和计算效率,进而影响列车行车安全和铁路运输效率。建立高速铁路列车制动曲线计算模型,研究速度分段个数、速度分段点位置、速度分段内减速度的选择对制动曲线计算精确度和计算效率的影响,提出减速度曲率分段和等间隔分段相结合的速度分段方法。仿真结果表明:根据列车制动减速度与速度的变化规律对速度进行分段,提高速度分段个数,速度分段内采用平均减速度,对速度进行有限分段,可以提高制动曲线的计算精确度。采用减速度曲率分段和等间隔分段相结合的速度分段方法,得到7段速度分段,使用有限数量的速度分段计算列车制动曲线,可以降低计算量,提高高速铁路列车制动曲线的计算效率;由于速度分段合理,采用7段速度分段简化模型计算列车制动曲线,可以保证列车制动曲线的计算精确度。

In the high-speed railway train control system,the on-board equipment calculates the target distance continuous speed control mode curve according to the move authority,line data and train braking parameters,and monitors the train position and speed in real time to ensure the safe and efficient operation of the train.For different speeds,high-speed railway trains have different braking capabilities.In the existing high-speed train control system,the speed is divided into a limited number of segments.The fixed deceleration is adopted in each segment.The speed monitoring curve is calculated with less speed segments.How to segment the train speed and determine the braking deceleration within the segment will directly affect the accuracy and efficiency of calculating the braking curve of the on-board equipment of high-speed railway trains,and will affect the train safety and railway transport efficiency.In the paper,the braking curve calculation model of high-speed railway train was established.The influences of the number of speed segments,the position of speed segments and the deceleration in speed segments on the calculation accuracy and efficiency of braking curve were studied based on this model.A speed segmentation method combining deceleration curvature segmentation and equal interval segmentation was proposed.The simulation results are as follows.The finite speed segmentation can improve the calculation accuracy of the train braking curve by segmenting the speed according to the change law of train braking deceleration and speed,increasing the number of speed segments and adopting the average deceleration in the speed segments.Using the speed segmentation method combining deceleration curvature segmentation and equal interval segmentation,seven speed segments are obtained.Using a limited number of speed segments to calculate the train braking curve can reduce the calculation amount and improve the calculation efficiency of the high-speed railway train braking curve.Because the speed segmentation is reasonable,the calculation accuracy of the train braking curve can be ensured by using the simplified model of 7-segment speed segmentation.