DYNAMIC BEHAVIOUR OF A FREIGHT WAGON WITH WHEEL FLAT WHEN RUNNING ON THE TRACK

Vlăduț-Marian DINU, Traian MAZILU, Ana-Maria DINU

Abstract


The flat is a serious damage of the rolling surface of the railway wheel. This defect occurs more frequently at the freight wagons when the wheel is blocked due to a braking system malfunction. In this paper, the dynamic behavior of a freight wagon with wheel flat when running along the track is examined to outline the influence of the dry friction from the wagon suspension upon the wheel/rail contact force and the carbody acceleration. To this aim, the wagon model is reduced to a two-mass oscillator with dry friction and the track is modelled using an infinite Euler-Bernoulli beam resting on two-layer viscoelastic foundation. Equations of motion are solved via the Green function method. It is shown the stick-slip vibration of the carbody excited by the wheel flat. Influence of the speed upon the carbody acceleration and the wheel/rail contact force is pointed out.

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References


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