About designing the height of the first profile of the marshalling hump

Abstract

The Height of the high-speed section of the sorting slide. Design of high-speed section of the marshalling hump. To prove mathematically the absence of theoretical basis of the formula by which the height of the first profile section of the marshalling hump is calculated in the current calculation method of marshalling humps. The paper uses the theorem on the change of kinetic energy for a non-free material point in the final form, known from theoretical mechanics. The research results revealed that the formulas by which the height of the first profile section of the marshalling hump is calculated to contradict the theorem on the change of kinetic energy for a non-free material point in the final form. The research results can be used in the processing of the normative-technical document on the design of hump devices on railways and making adjustments to the dynamics of rolling the car in textbooks for universities of railway transport. The results of the calculations proved the incorrectness of the derivation of the formula for calculating the height of the first profile section of the marshalling hump in the normative-technical document “Rules and standards for the design of sorting devices on the railways with gauge 1 520 mm”.

The influence of random factors on the estimation of the speed and time of rolling cuts from sorting humps

“…Larger average squared time deviations are characteristic for lower speeds of the leaving cuts from retarders t(sр), and, accordingly, larger time reserves are needed to ensure reliable separation of cuts according to condition (5).…”

“…In the future, the rolling cuts models were developed and today they are the main tool for solving various problems of evaluating design options and technical facilities of sorting humps. Articles [1][2][3][4][5][6] are devoted to the problems solving of improving the design of sorting humps and yards. It should be noted that at the design stage, calculated cuts with known parameters and their various unfavorable combinations are mainly considered.…”

“…EOT-2023 https://doi.org/10.1051/matecconf/2023?? ?04001 6To assess the influence of various factors on the mean square deviation of the cut motion time σ[t], a full factorial experiment was performed according to plan 25 to identify the model…”