Influence of Application Time Regulated Limits on Longitudinal Dynamic Forces in Passenger Short Trains during Braking Process

This paper investigates an original aspect in the study of longitudinal dynamics of trains submitted to braking actions: the influence of application time admitted ranges on in-train forces. Basic theoretical aspects are outlined and experiments were carried out in order to accurately determine the filling characteristics of brake cylinders. These were implemented in an original simulation program used for the study of three vehicles train. Results, discussions and conclusions reflect significant increases in the level of both compression and tensile in-train forces. The evolution and the disposition of these forces in the long of the train are also affected. Key-Words: railway vehicles, longitudinal dynamic forces, air brake distributor, application time, filling characteristics, air pressure increase rate