1 Department of Engineering for Enterprise “Mario Lucertini" - University of Rome “Tor Vergata”, via del Politecnico, 1, 00133 Rome, Italy
2 Tecnologie Meccaniche e Sistemi Frenanti - Ingegneria Rotabili e Tecnologie di Base, Direzione Tecnica TRENITALIA, Viale Spartaco Lavagnini, 58, 50129, Firenze, Italy
The paper describes the automatic procedure, implemented in UIC software TrainDy, for the simulation of friction coefficient of new LL shoes, used to avoid noise from freight traffic.
This procedure uses certified experimental data obtained at dynamometer bench as input data and computes a series of polynomials laws that describe the evolution of friction coefficient with speed, for different values of normal force between brake blocks and wheel and for different initial braking speeds.
Numerical results are compared against two series of experimental slip tests, carried on Trenitalia freight wagons, in terms of both stopping distances (for different starting speeds and loading conditions) and pressure in brake cylinder, speed and acceleration. Errors in terms of stopping distance are always below 5% whereas errors in terms of maximum acceleration are up to 20%.
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* Address correspondence to this author at the Department of Engineering for Enterprise “Mario Lucertini" - University of Rome “Tor Vergata”, via del Politecnico, 1, 00133 Rome-Italy, Tel: +390672597133; E-mail: Luciano.Cantone@uniroma2.it