In the present research, a low-cost maintenance operation for avoiding hunting instability occurring on a section of a metro line has been proposed and experimentally verified. On the considered track, metro trains were suffering from hunting instability already at the relatively low speed of 60 km/h, thus preventing them to reach their maximum operating speed of 85 km/h and requiring wheel re-profiling after approximately 25000 km. The cause of such unstable motion was identified in the highly worn rail profiles that determined a highly conformal contact with wheel profiles. The level of conformity of wheel-rail profiles led to equivalent high conicity values. The main cause was found to be the very low damping of the bogie suspensions. Since the installation of anti yaw dampers on all vehicles was judged economically unfeasible, the problem was solved by changing rail inclination and thus modifying contact conditions between wheel and rail. Numerical simulations showed that a zero inclination angle would have allowed to gain the highest increase in the vehicles stability and that there is a clear dependence between the high equivalent conicity and the vehicles critical speed. Nevertheless the stakeholder decided to reduce the original rail inclination instead of removing it. Although not optimal, this maintenance operation still allowed the avoidance of hunting motion up to the vehicles maximum speed. Experimental results, before and after the maintenance operation, are presented and compared to numerical simulations obtained with a non-linear vehicle-track interaction model.


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    Titel :

    Low-cost maintenance operation for avoiding hunting instability in a metro vehicle


    Beteiligte:
    Braghin, F. (Autor:in) / Alfi, Stefano (Autor:in) / Bruni, S. (Autor:in) / Collina, A. (Autor:in)


    Erscheinungsdatum :

    2010


    Format / Umfang :

    13 Seiten, 14 Bilder, 2 Tabellen, 5 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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