货运列车通过变坡点时纵向性能研究

Longitudinal Dynamics Performance Study of Haul Train on the Condition of Passing the Point of Gradient Change

根据列车纵向动力学原理,用计算机语言编制列车纵向动力学仿真程序。用该程序对列车在通过变坡点时紧急制动和常用制动缓解工况的纵向性能进行研究。以列车在平直道上的紧急制动和常用制动缓解工况的纵向冲动计算值作为基准值,将列车在凹形线路纵断面的紧急制动纵向冲动计算结果和凸形线路纵断面的常用制动缓解纵向冲动计算结果与基准值比较,用以确定列车通过变坡点时最不利的变换工况位置。从而对列车运行的优化操纵有一定的指导作用。

Simulation software of train dynamics was programmed according to the theory of train dynamics.When a train is passing the point of gradient change,with the help of the simulation software,the longitudinal dynamics performance on the conditions of emergency brake and release of service brake was studied.The paper compared the computing results on lines of concave longitudinal profile and convex longitudinal profile with the computing results of longitudinal dynamics performance on tangent track.Thereby the train＇s least favorable position relative to the point of gradient change can be obtained by the analysis of the paper.