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A numerical method for the simulation of freight train emergency braking operations based on the UIC braked weight percentage

引用

railway Engineering Science 2023年第2期31卷 162-171页

作者： N.Bosso Matteo Magelli N.Zampieri Department of Mechanical and Aerospace Engineering Politecnico di TorinoC.so Duca degli Abruzzi 2410129 TurinItaly

The present paper shows the development of a strategy for the calculation of the air brake forces of European freight trains. The model is built to upgrade the existing Politecnico di Torino longitudinal train dynamics(LTD) code LTDPoliTo, which was originally unable to account for air brake forces. The proposed model uses an empirical exponential function to calculate the air brake forces during the simulation, while the maximum normal force on the brake friction elements is calculated according to the indication of the vehicle braked weight percentage.Hence, the model does not require to simulate in detail the fluid dynamics in the brake pipe nor to precisely know the main parameters of the braking system mounted on each vehicle. The model parameters are tuned to minimize the difference between the braking distance computed by the LTDPoliTo code and the value prescribed by the UIC544-1 leaflet in emergency braking operations. Simulations are run for different configurations of freight train compositions including a variable number of Shimmns wagons trailed by an E402B locomotive at the head of the train, as suggested in a reference literature paper. The results of the proposed method are in good agreement with the target braking distances calculated according to the international rules.

关键词： railway brake modelling Emergency braking UIC braking system braked weight Longitudinal train dynamics

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