Probability distributions of specific resistance to the movement of cuts on gravity humps

   The current standards for calculating the forces of resistance to the movement of cars when rolling down a gravity hump are considered; the reasons for the need to update the numerical characteristics of the resistance forces to the movement of cars for use in carrying out structural and technological calculations of sorting devices are established. The results of processing statistical data on the rolling of 5000 cuts from the marshalling yard of station I in 2022 using the automated system Computer Vision are presented. The probability distribution densities of the specific resistance to the movement of cuts are given based on the results of processing statistical data on the rolling of cuts from a gravity hump. Comparison of the numerical characteristics of the distribution densities to the resistance to the movement of the car, used in the existing calculation method and obtained from the results of processing statistical data on the rolling of cuts on an operating gravity hump, was made.
   It has been established that the parameters of the probability distribution of the total specific resistance to the movement of cuts (mathematical expectation and standard deviation) have significantly lower values than those currently used in the calculation of hump yards. In addition, it was found that the running properties of cuts began to depend less on their weight.
   The reason for this is that over the past period since the last measurements of the resistance forces to the movement of cars when rolling down the hill, the rolling stock has changed significantly. In the manufacture of cars, better materials are used, the design of the rolling stock has changed, innovative cars have appeared, the share of which in the railway network is constantly increasing.
   Changes in the running properties of cuts must be taken into account when calculating sorting devices. Recommendations are given for the further use of the results obtained and the improvement of the rules and norms for the design of sorting devices.

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