A fixed coordinate system formulation for the rigid multibody rail wagon dynamics presented earlier by the authors is reviewed. The formulation employs a three-dimensional contact model with full parametrisation of the surfaces of the two contacting bodies. The benefit of the formulation is its ability to determine roll of the wagon components, which other standard commercial packages cannot determine. Further the model does not require setting up of speed profile as a priori since the speed is determined as a result of the applied brake/traction torque. Several numerical examples were studied to examine the effects of brake/traction torque on tracks with various types and levels of irregularities. The following conclusions were made: (1) The wagon yaw, pitch and roll exhibit a positive propositional relationship with the track defect amplitude. (2)LB torque results in large wheel unloading ratio to the track lateral irregularity; wagons under normal level of braking or no-torque (steady-state case) do not suffer wheel unloading due to track irregularities considered in this paper. (3) With the increase in the longitudinal phase difference of the sinusoid irregularity between the left/right rails (cross level), the wagon roll increases. Cross-level defects also determine when the largest wagon body/bogie roll is likely to occur. (4) The sinusoidal track irregularity effect on wagon roll is more severe than the cross-level irregularity-induced wagon roll in the model consider in this paper. (5)The normal torques generally do not induce bogie roll; however, large external torques can affect the wagon body roll. (6) LB torque generally increases the absolute value of the wagon body roll while the traction effects induce far more complex dynamics of bogies and wagon body. (7) If no brake torque is applied on the worn wheel/rail, steady wheel lateral forces can still be achieved.


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    Title :

    Dynamics of railway wagons subjected to braking torques on defective tracks


    Additional title:

    Dynamik von Eisenbahnwagen während des Bremsvorgangs auf schadhaftem Gleis


    Contributors:

    Published in:

    Vehicle System Dynamics ; 50 , 1-3 ; 109-131


    Publication date :

    2012


    Size :

    23 Seiten, 22 Bilder, 11 Tabellen, 22 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Dynamics of railway wagons subjected to braking torques on defective tracks

    Zhang, Zuoyan / Dhanasekar, Manicka | Taylor & Francis Verlag | 2012


    Dynamics of railway wagons subjected to braking torques on defective tracks

    Zhang,Z. / Dhanasekar,M. / Parsons Brinckerhoff,AU et al. | Automotive engineering | 2012




    Dynamics of railway wagons subjected to braking/traction torque

    Zhang, Zuoyan / Dhanasekar, Manicka | Tema Archive | 2009