基于多质点模型的重载列车动能闯坡性能

采用列车多质点纵向动力学模型, 研究了列车初速度、列车编组、坡道长度与坡度对列车动能闯坡性能的影响, 并与列车单质点模型进行了对比分析, 然后结合具体算例对比了2种模型在动能闯坡最大牵引质量方面的差异。分析结果表明: 列车闯坡初速度越大, 闯坡性能越优; 列车闯坡性能随列车编组、坡道长度与坡度的增大而变差; 2种模型列车闯坡最低速度的差异随列车闯坡初速度的减小而增加, 初速度为60km·h^-1时单质点与多质点模型的列车闯坡最低速度相差5.29km·h^-1; 列车编组、坡长与坡度越大, 单质点模型的计算结果越保守; 基于单质点模型的列车最大牵引质量为8 250t, 基于多质点模型的列车最大牵引质量为8 750t, 后者比前者增加了6.1%;建议采用列车多质点纵向动力学模型计算列车动能闯坡最大牵引质量。

Kinetic energy uphill performance of heavy-haul train based on multi-particle model

Train multi-particle longitudinal dynamics model was used to analyze the influences of train initial speed, train marshalling, slope length and slope gradient on the kinetic energy uphill performance of train.A comparison between multi-particle model and single particle model was made.A specific example was given to illustrate the difference of the maximum tractive tonnages between the two models in the kinetic energy uphill.Analysis result indicates that the higher the uphill initial speed is, the better the uphill performance is.The uphill performance declines with the increases of train marshalling, slope length and slope gradient.The difference of train uphill lowest speed of two models increases with the decrease of train uphill initial speed.The difference of the uphill lowest speeds of two models is 5.29km·h-1 when the initial speed is 60km·h-1.The calculation result of single particle model is more and more conservative with the increases of train marshalling, slope length and slope gradient.Train maximum tractive tonnages are 8 250 t and 8 750 t based on single particle model and multi-particle model respectively, in which the latter is 6.1% higher than the former.It is suggested that the multi-particle longitudinal dynamics model can be adopted to calculate train maximum tractive tonnage in kinetic energy uphill.