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International Journal of Railway Technology
ISSN 2049-5358
IJRT, Volume 2, Issue 3, 2013
Railway Vehicle Dynamics under Degraded Adhesion Conditions: An Innovative HIL Architecture for Braking Tests on Full-Scale Roller-Rigs
B. Allota, R. Conti, E. Meli, L. Pugi and A. Ridolfi

Department of Industrial Engineering, University of Florence, Italy

Full Bibliographic Reference for this paper
B. Allota, R. Conti, E. Meli, L. Pugi, A. Ridolfi, "Railway Vehicle Dynamics under Degraded Adhesion Conditions: An Innovative HIL Architecture for Braking Tests on Full-Scale Roller-Rigs", International Journal of Railway Technology, 2(3), 21-53, 2013. doi:10.4203/ijrt.2.3.2
Keywords: hardware in the loop, railway braking, degraded adhesion conditions, roller-rigs.

Summary
In this paper an innovative hardware in the loop (HIL) architecture to test braking on board subsystems on full-scale roller-rigs is described. The new approach permits the reproduction of a generic wheel-rail adhesion pattern on the roller-rig and, in particular, degraded adhesion conditions. The strategy presented is also followed by the innovative full-scale roller-rig of the Railway Research and Approval Center of Firenze-Osmannoro (Italy); the new roller-rig has been built by Trenitalia and is owned by SIMPRO. At this initial phase of the research activity a complete model of the HIL system has been developed to effectively validate the proposed approach. The complete numerical model is based on the real characteristics of the components provided by Trenitalia. The results coming from the simulation model have been compared to the experimental data provided by Trenitalia and consistent with ontrack tests performed in Velim, Czech Republic, with a UIC-Z1 coach equipped with a fully-working WSP system. The preliminary validation performed with the HIL model highlights the good performance of the HIL strategy in reproducing the complex interaction between degraded adhesion conditions and railway vehicle dynamical behaviour during the braking manoeuvre on the roller-rig.

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