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高速列车在上下坡时,如果速度变化过于剧烈,则会影响平均行车速度,同时会因频繁的加速和减速而造成运营费用的增加。列车的速度变化又与列车运行工况以及坡度和坡长有关。因此,分别在不同坡度上,对高速列车在不同运行工况下,速度变化与坡度和坡长的关系进行研究,对于高速铁路坡度和坡长的选取有着重要的意义。以CRH2-300和CRH3型电动车组为例,通过分析两种电动车组的牵引和制动性能,分别对两种电动车组在不同的坡度上,牵引、惰行、制动等不同的运行工况下,速度随坡长的变化情况进行了计算,从而为在综合考虑工程量和运营费用时,不同的地形条件下,高速铁路坡度和坡长的选取提供依据。
When a high-speed train goes uphill or downhill, if the speed changes too drastically, it will affect the average driving speed and cause an increase in operating expenses due to frequent acceleration and deceleration. The speed of the train changes with the train operating conditions and the slope and slope length. Therefore, on different slopes, the relationship between speed changes and slope and slope length under different operating conditions is studied, which is of great significance for the selection of slope and slope length of high-speed railway. Taking the CRH2-300 and CRH3 EMUs as examples, the author analyzes the traction and braking performance of the two EMUs respectively on different grades such as traction, idling and braking of the two EMUs And the change of speed with the slope length was calculated, which provided the basis for the selection of the slope and slope length of high-speed railway under different topographical conditions considering engineering quantity and operation cost.