DOI: https://doi.org/10.15802/stp2020/199485

STABILITY OF FREIGHT CARS UNDER THE ACTION OF COMPRESSIVE LONGITUDINAL FORCES

A. O. Shvets

Abstract


Purpose. The aim of the work is: a theoretical study of the car movement stability when exposed to longitudinal forces of a quasistatic nature; determination of analytical for estimating the longitudinal loading of cars in trains; the influence analysis of simultaneous action of certain factors on the value of longitudinal forces, at which the car movement stability is still preserved. Methodology. Assessment of the freight car stability when moving at different speeds along curved track sections was investigated using the analytical method. The most unfavorable schemes for applying compressive longitudinal forces in a vertical and horizontal plane are considered. Findings. Expressions are obtained for calculating the value of the car lift resistance coefficient by the longitudinal compressive force acting on the car as part of a freight train. The calculations were carried out in an empty and loaded state with a transverse run-up of the car body frame relative to the track axis in a guiding section of 50 mm in a curve of small radius taking into account the inertia forces from the unbalanced acceleration. Originality. In a theoretical study, the effect on the movement stability of quasistatic longitudinal compressive forces depending on the change in speed and the force value, as well as the effect of friction forces at the contact point of the wheel flange and rail and the eccentricity of fastening the tail of the automatic coupler, are considered. The influence of longitudinal compressive forces on the stability of freight rolling stock when moving in a curve of small radius with speeds up to a design value of 120 km/h is investigated. Practical value. The application of the results obtained by the above method will help to increase the stability of the freight rolling stock, which in turn will allow increasing the technical speed of train movement by removing some existing limits of permissible speeds. Using the described methodology for determining the car lift resistance coefficient will allow justifying the cause of wheel derailment, as well as to develop and put into practice the technical measures to prevent the lift of carriages, thrusts and shears of the track.


Keywords


safety; gondola car; lift resistance coefficient; curved track sections; longitudinal forces; movement speed

References


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Hazrati Ashtiani, I., Rakheja, S., & Ahmed, A.K.W. (2017). Influence of friction wedge characteristics on lateral response and hunting of freight wagons with three-piece bogies. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 231(8), 877-891. DOI: https://doi.org/10.1177/0954409716647095 (in English)

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Shvets, A. A., Zhelieznov, K. I., Akulov, A. S., Zabolotnyi, A. N., & Chabaniuk, Ye. V. (2015). Determination of the issue concerning the lift resistance factor of lightweight car. Science and Transport Progress, 6(60), 134-148. DOI: https://doi.org/10.15802/stp2015/57098 (in English)

Wu, Q., Spiryagin, M. & Cole, C. (2016). Longitudinal train dynamics: an overview. Vehicle System Dynamics, 54(12), 1688-1714, DOI: https://doi.org/10.1080/00423114.2016.1228988 (in English)


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