Study of the dynamics of freight cars with radial-type trucks

Abstract

At present, a topical problem for the Ukrainian railways is a reduction of freight car and track structure maintenance and repair cost. An increase in train mass and speed significantly increases vehicle and track wear due to increased wheel-rail interaction forces. A way to reduce wheel-rail wear and interaction forces in curves is to use devices that align the wheelsets in a radial orientation. The aim of this work was to analyze the effect of the design features of freight-car trucks associated with the use of devices that align the wheelsets in a radial orientation on the indices of wheel-rail dynamic interaction and to choose their advisable parameters that would allow one to improve the running gear of different vehicles. To accomplish these objectives, mathematical simulation, oscillation theory, and elasticity theory methods were used. The motion of cars with variously designed trucks in curves was simulated. The analysis of the results showed that devices that align the wheelsets in a radial orientation have a favorable effect on wheel-rail interaction processes: they improve the car riding qualities and the wheel-rail interaction indices by (15-25) % and (20-45) %, respectively. Advisable parameters of these devices were chosen in such a way as to provide both a far lower level of wheel-rail dynamic interaction for vehicles of different types in curves and their high riding qualities in tangents at speeds up to 120 km/h.

Analysis of lateral forces at the wheel-rail contact in cases of derailment Incidents

“…The work [6] involved the simulating the movement of freight wagons with various bogie design configurations along curved sections of the track. The analysis of the results obtained showed that the use of devices that ensure the radial installation of wheelsets has a positive effect on the processes of interaction between wheels and rails.…”

“…Research in works [1][2][3][4][5][6] and works [7][8][9][10] are different. In works [1][2][3][4][5][6], the dynamics of rolling stock and the stability of its movement have been extensively studied, accompanied by proposed approaches for preventing railway accidents.…”

“…Research in works [1][2][3][4][5][6] and works [7][8][9][10] are different. In works [1][2][3][4][5][6], the dynamics of rolling stock and the stability of its movement have been extensively studied, accompanied by proposed approaches for preventing railway accidents. On the other hand, works [7][8][9][10] primarily address the inverse problem, where a railway transport accident has already transpired, necessitating the determination of the circumstances and factors contributing to its occurrence.…”

Justifying the prolongation of the service life of the bearing structure of a tank car when using Y25 bogies

“…A study into the dynamics of freight cars equipped with devices for providing the radial installation of wheelsets is reported in work [10]. The authors modeled the movement of freight cars with various variants of bogie designs, including 18-100, along the curved sections of the track.…”

“…Our review of the scientific literature [1][2][3][4][5][6][7][8][9][10][11] allows us to conclude that the issue of prolonging the service life of cars, including a tank car, implying the use of Y25 bogies has not yet been covered. This necessitates appropriate research in the specified area.…”