Observations on the Vancouver mass transit system suggest that noise, vibration and corrugation of the rail appear to be associated with close conformity between the transverse profiles of the wheel and rail. To investigate this, a dynamic model of wheel and rail under conditions of close conformity has been developed. Previous work has suggested that motion of the wheel could be neglected, so the model comprises two subsystems: (a) the rail and it's supports, and (b) the contact between wheel and rail. A dynamic model of a continuously supported rail is presented, which is consistent with similar models in the literature. Conformal contact has been represented in two ways: (a) as a single highly eccentric elliptical contact, and (b) as a two-point contact. Novel 'rolling contact mechanics' have been incorporated in both these models. The complete system is closed: oscillations of the rail give rise to fluctuating contact forces, which in turn excite the rail. A linear stability analysis of the system shows it to be stable under all conditions examined, thus precluding the possibility of self-excited oscillations occurring on a perfectly smooth railhead, which is the subject of the following paper (to be continued).


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    Title :

    Wheel-rail dynamics with closely conformal contact. Part 1: dynamic modelling and stability analysis


    Additional title:

    Modellentwicklung zur Rad-Schiene-Dynamik mit streng konformem Kontaktverhalten. Teil 1: Stabilitätsanalyse und dynamische Modellierung für Einpunkt-Auflage und Zweipunkt-Auflage zwischen Rad und Schiene


    Contributors:
    Bhaskar, A. (author) / Johnson, K.L. (author) / Wood, G.D. (author) / Woodhouse, J. (author)


    Publication date :

    1997


    Size :

    16 Seiten, 14 Bilder, 17 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English