Russian Federation
Purpose: To establish the criteria for evaluating the track gradient in a marshalling yard when implementing the interval-targeted braking mode. The prevailing regulatory framework stipulates uniform values for the sorting track gradients across all gravity hump stations. It is important to note that each sorting hump is designed and equipped differently, and each has its own specific wagon flow. Furthermore, the meteorological conditions of different areas are unique. Consequently, the sorting track gradients should be calculated with reference to the aforementioned features for each specific gravity hump. Methods: The following research methods were employed: an analysis of the regulatory documents for the design of elements of the sorting track longitudinal profile; the existing numerical characteristics of the main specific resistance to the movement of wagons; and the methods for calculating the specific resistance forces acting on the wagons rolling down the gravity hump. The study of the accumulation of wagons was carried out using the method of imitation modelling of the wagon cuts rolling down the marshalling yard sorting tracks from the braking position to the stopping point. The experimental results were analyzed using the probability theory and mathematical statistics. Results: It has been determined that the assessment of the sorting track gradient can be conducted by determining the following indicators: the probability of uncoupled wagons being under-rolled to the designated wagon groups in the yard; the probability of wagon cuts being attached to a designated wagon group at a higher speed in the yard; and the compliance of the moving wagon cuts with the required operating conditions. The given method of estimating the sorting yard track gradient can be used for gravity humps on which the interval-targeted braking mode is implemented. The method’s distinctive feature is that it does not involve the use of additional technical mechanisms along the sorting track that influence the rolling wagon cuts. The random nature of train accumulation is determined by this absence. To assess its quality, it is recommended that probabilistic indicators be used. Practical significance: The proposed method can be used to assess the performance of gravity humps, as well as to compare design options for the construction of new sorting yards or the reconstruction of existing ones.
Marshalling yard track gradient, the main specific resistance to the movement of wagons, simulation modelling of sorting track filling process, the run distance of the wagon cuts, speed of wagon collision, speed regulating modes for wagon cuts rolling
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