Abstract
To increase the efficiency of using railway transport, the possibility of using new designs of bogies, for example, Y25 under "wide gauge" wagons was considered. In order to substantiate the proposed solution, mathematical modeling of the dynamic loading of the hopper wagon Y25 bogies was carried out. A hopper wagon for the transportation of pellets and hot sinter model 20-9749 built by the State Enterprise "Ukrspetsvagon" (Ukraine) was chosen as a prototype. The simulation results showed that the use of Y25 bogies for hopper wagons allows to reduce the acceleration of its load-bearing structure, in comparison with the use of conventional 18100 bogies, by 36 %. Other performance indicators are also significantly improved.
 The use of Y25 bogies for hopper wagons with actual parameters allows to reduce the acceleration of its load-bearing structure, in comparison with the use of conventional 18100 bogies, by 28 %.
 The determination of the main indicators of the strength of the bearing structure of the hopper wagon Y25 bogie was carried out. The calculation was carried out in the SolidWorks Simulation software package (CosmosWorks), (France), which implements the finite element method. The calculations showed that the maximum equivalent stresses in the load-bearing structure of a hopper wagon with nominal parameters are 17 % lower than the stress acting in the load-bearing structure of a wagon on bogies 18–100 V of the load-bearing structure of a hopper wagon with actual parameters, the maximum equivalent stresses are 12 % lower per voltage in the load-bearing structure on bogies 18100.
 The conducted research will help to reduce the load on the load-bearing structures of hopper wagons in operation, improve the dynamics and strength indicators, as well as their service life
Highlights
The prospects for the technical and economic development of European countries, as well as the strengthening of their external relations, determine an increase in the efficiency of the ope ration of railway rolling stock, as a leading branch of the transport system
The resulting value of stresses is 17 % lower than the stress acting in the load-bearing structure of the wagon on 18–100 bogies
It was found that the use of Y25 bogies for hopper wagons with nominal parameters makes it possible to reduce the acceleration of its load-bearing structure, in comparison with conventional bogies 18–100, by 36.1 % (Fig. 6)
Summary
The prospects for the technical and economic development of European countries, as well as the strengthening of their external relations, determine an increase in the efficiency of the ope ration of railway rolling stock, as a leading branch of the transport system. The determination of the influence of the Y25 bogie on the dynamic loading of the load-bearing structure of a freight wagon is not carried out in these works. The authors did not conduct research on the use of bogies with optimal characteristics of spring suspension to reduce the dynamic loading of the load-bearing structures of the wagons. The conducted literature review allows to conclude that the issue of determining the dynamic loading of the load-bearing structures of wide-gauge wagons on Y25 bogies has not yet been covered. This requires appropriate research in this direction. – to determine the strength indicators of the load-bearing structure of the hopper wagon
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