Abstract
To ensure the structural strength of open-top wagons, it has been proposed to introduce the concept of a traction device that could be implemented in open-top wagons with bearing elements made of round pipes. Feature of the concept is that the console parts of the girder beam are filled with a viscous substance with damping and anticorrosive properties. To convert the shock kinetic energy into the dissipation energy, the concept design includes a piston with two throttle valves (inlet and outlet).In order to determine the dynamic load on the bearing structure of an open-top wagon equipped with a concept design of the traction device, mathematical modeling was performed. A mathematical model of the open-top wagon dynamic load during shunting collision has been constructed. It was considered that the frame of an open-top wagon is exposed to a longitudinal load of 3.5 MN. Differential equations were solved in line with a Runge-Kutta method in the programming environment Mathcad. It was established that the maximum magnitude of acceleration that acts on an open-top wagon, taking the improvement into consideration, is about 30 m/s2. The proposed technical solutions make it possible to reduce the magnitude of dynamic load on a open-top wagon’s bearing structure at shunting collision by 25 %.The software CosmosWorks was used to perform computer simulation of the dynamic load on an open-top wagon. The finite element method was applied as a calculation technique. In this case, maximum accelerations amounted to about 37 m/s2 and were concentrated at the console parts of a girder beam.Adequacy of the developed models of dynamic loading on an open-top wagon’s bearing structure was tested against the Fisher criterion (F-criterion). The optimal number of measurements was defined based on the Student-Gorset criterion. The results from calculation have demonstrated that the hypothesis of adequacy is not rejected.This study will contribute to a decrease in the dynamic load on the bearing structures of open-top wagons in operation, as well as bring down the cost of unscheduled repairs. The current research enables the compilation of guidelines on designing innovative rolling stock with improved technical and economic indicators.
Highlights
The development of economic activity between Eurasian states necessitates providing transport industry with innovative rolling stock that has improved technical and economic indicators
Paper [12] reported a research into the dynamic loading and strength of the bearing structure of an open-top wa gon’s body at shunting collision
To decrease the dynamic loading on the bearing structure of the open-top wagon under operational load, we propose using, instead of the automated coupling traction device, a new concept design (Fig. 3, 4)
Summary
The development of economic activity between Eurasian states necessitates providing transport industry with innovative rolling stock that has improved technical and economic indicators. The humps of marshalling stations service a large number of cars on a daily basis In this case, the operational speed of humping devices continuously increases. To ensure the preservation of open-top wagons at shun ting collision, which is the case of the largest loading on the structure during operation, it is essential to improve cars to reduce dynamic loading [2]. One of the most effective ways to resolve this issue is the practical implementation of the new concept design of a traction device that would absorb the longitudinal dynamic loads Such a technical solution would make it possible to simplify the structure of the current traction device, and, improve its reliability and energy capacity. The proposed measures could improve the efficiency of open-top wagons operation at the modern stage of development of the rail industry
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