The paper investigates the influence of different braking systems on the braking process of railway passenger vehicles, considered individual, as well as in train composition. The study focuses on the braking capacity - evaluated by stopping distance - and on the longitudinal dynamic of train, involving vehicles fitted with either disc brakes in fast-action, or cast iron block brakes in high power action mode. The specific dependence of the correspondent friction engenders particular braking characteristics. If associated to the limited braking forces by wheel-rail adhesion, different stopping distances result, while time evolution of braking process generates specific response of in-train forces, depending on vehicles' combination in the train body. The study is based on MATLAB numerical simulations. For higher accuracy, experimental data of air pressure evolution in brake cylinders were adequately implemented. Simulations were performed for trains consisting of five coaches on four axles hauled by a six axle locomotive. All possible combinations of braking characteristics in the train composition were considered. Compression and tension forces in couplers and stopping distances are presented as results. The current study continues our previous research in this area. To our knowledge, such aspects of braking process in passenger trains were not investigated by other authors.
展开▼
