During the movement of heavy-haulers trains, longitudinal oscillations occur, accompanied by significant longitudinal forces. In some cases, for example, in case of violation of the traction control technology of locomotives, the values of these forces reach values that can cause damage and destruction of autocoupler devices of wagons and train rupture, which is a serious violation of traffic safety. In some cases, the problem is complicated by the factor of fatigue wear, which has a significant impact on the resistance of components to mechanical stress. Also, in addition to dynamic forces, slowly changing quasi-static forces are also dangerous, which can cause cars to be squeezed out of the track and derail them. In the work, longitudinal oscillations arising in a train are investigated using mathematical modeling methods. To solve the problems considered, a multi-mass model of the train was used, taking into account the nonlinear and nonlinearizable characteristics of the absorbing devices of the automatic couplers, the nonlinear nature of the change in the resistance forces acting on the train, and the location of the train on several elements of the track profile. An assessment of the stability reserves against squeezing was performed, when calculating which the vertical and lateral forces of interaction between the wagon wheel and the rail are taken into account. Based on the research carried out, the concept of constructing a system for automatic control of the speed of a freight train is proposed; for this purpose, a system of criteria is proposed to assess the quality of control of the speed of a freight train from the point of view of traffic safety, recommendations are given on the structure of the speed control loop, and the method of selecting the parameters of the speed control law using multi-criteria optimization methods is considered.
Automatic Speed Control of Heavy-Haulers Trains
Energy, Environment, and Sustainability
14.06.2023
19 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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