This study focused on the continued development of the multibody dynamics friction wedge model within the multibody dynamics framework. The development of the multibody dynamics model gives an opportunity to improve wedge modelling by creating more realistic models. Improved wedge modelling can potentially increase the accuracy of simulating and predicting detrimental freight train crash/derailment phenomenon that is caused by wedge lock-up and bogie hunting. The variably and constantly damped quarter-bogie models were expanded from quarterbogie to half-bogie models. The friction wedges retain the same translational and rotational degrees of freedom as when modelled as a quarter-bogie. These degrees of freedom include longitudinal and vertical translations and yaw and pitch rotations. For the half-bogie models, the input body was modified to receive inputs from the sideframe as with an actual three-piece bogie, rather than the bolster in the quarter-bogie models. These models were compared for all toe cases and benchmarked with equivalent models created in NUCARS. The variably damped half-bogie and constantly damped half-bogie models correlated reasonably well with the established train software NUCARS, despite the differences in modelling paradigm. For each model the NUCARS models displayed more friction-like behaviour than the multibody dynamics models. This discrepancy in friction could be due to the friction formulations within each model, as well as the introduction of masses and unilateral contact conditions. While the accuracy of the friction formulation can benefit by comparing the multibody dynamics model with real-world test data, there will be other factors involved in the interaction that will have to be approximated to enable the model to run within a reasonable amount of time. In the future, it is recommended by the authors that further development of a fullbogie variably damped model and warp model within the multibody dynamics framework is needed. MAMBO is a more realistic representation of the wedge, but is still in the early stages of development. The development of these models will open up the opportunity to validate the multibody dynamics model with real-world frame warp test data in progress, and have the high potential to contribute to the depth and breadth of knowledge on freight train dynamics.
Multibody dynamics modelIing of the freight train bogie system
Dynamische Mehrkörpermodellierung des Güterwagen-Drehgestellsystems
Vehicle System Dynamics ; 49 , 4-6 ; 501-526
2011
26 Seiten, 31 Bilder, 2 Tabellen, 21 Quellen
Article (Journal)
English
Multibody dynamics modelling of the freight train bogie system
Taylor & Francis Verlag | 2011
|Multibody dynamics modelling of the freight train bogie system
Online Contents | 2011
|Multibody dynamic modelling of the freight train bogie system
Automotive engineering | 2011
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