Positioning operations are performed in a railway goods yard, in which the freight train is pulled precisely at a specific point by a positioner. The positioner moves strictly according to the predesigned speed and provides all the traction and braking forces which are highly dependent on the longitudinal dynamic response. In order to improve the efficiency and protect the wagons from damage during positioning operations, the design speed of the positioner has to be optimised based on the simulation of longitudinal train dynamics. However, traditional models of longitudinal train dynamics are not accurate enough in some aspects. In this study, we make some changes in the traditional theory to make it suitable for the study of long freight trains in positioning operations. In the proposed method, instead of the traction force on the train, the motion of the positioner is assumed to be known; more importantly, the traditional draft gear model with nonlinear spring and linear damping is replaced by a more detailed model based on the achievement of contact and impact mechanics; the switching effects of the resistance and the coupler slack are also taken into consideration. Numerical examples that deal with positioning operations on the straight lines, slope lines and curving lines are given.
Simulation of longitudinal dynamics of long freight trains in positioning operations
Simulation der Längsdynamik von langen Güterzügen beim Positionierbetrieb
Vehicle System Dynamics ; 50 , 9 ; 1409-1433
2012
25 Seiten, 40 Bilder, 40 Quellen
Aufsatz (Zeitschrift)
Englisch
Simulation of longitudinal dynamics of long freight trains in positioning operations
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|Simulation of longitudinal dynamics of long freight trains in positioning operations
Taylor & Francis Verlag | 2012
|Simulation of longitudinal dynamics of long freight trains in positioning operations
Online Contents | 2012
|Longitudinal dynamics of freight trains
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|Longitudinal dynamics of freight trains
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