Abstract
Determination of frictional condition of the running surface and side surface of the top of rail (lubrication) that ensures the best interaction of the rolling stock wheels and the rail, reduces the force action and thus ensures the track stability and reduced side wear of rails in the curved tracks is relevant for all the rail net.The objective of research is to determine the influence of frictional condition of the track rail surfaces on the interaction forces in the “wheel/rail” contact with various motion parameters (speed, radius).The theoretical and experimental methods were used in the research. The theoretical methods include multioptional computer modelling of axial and lateral forces that appear in the curved tracks during the freight train movement in the software package “Universal Mechanism”. The modelling results were processed with the use of correlation and regression analysis. The experimental methods include full-scale measurements in the existing track and results processing.According to the research results, the theoretical algorithms for assessment of influence of the running surface lubrication on the forces. The option of frictional condition of the wheel and rail interaction surfaces has been established to ensure reduction in the operating expenses for surfacing and rail replacement, energy costs for haulage of freight train.
Highlights
The length of the railways of the Russian Federation makes 85,000 km, 33% of them are the curved tracks, the third part of which has the radii from 400 to 700 m
The objective of the research is to determine frictional condition of the running surface and side surface of the top of rail to ensure the best interaction of the rolling stock wheels and the rail, reduces the force action and ensures the track stability and reduced side wear of rails in the curved tracks is relevant for all the rail net
The portable rail tribometer developed by the Research and Design and Technological Institute of Rolling Stock (VNIKTI) [9] with MIC-212 module by SPC “Mera” as shown in Figure 1 was used as a tool for the friction force measurement and for the friction coefficient calculation
Summary
The length of the railways of the Russian Federation makes 85,000 km, 33% of them are the curved tracks, the third part of which has the radii from 400 to 700 m. When a train passes the curved tracks, especially those of small radius, frictional resistance appears that influences the energy consumption and impairs the track geometry stability, intense wear of wheels and rails. These problems are caused by dynamic forces (axial and lateral) appearing in the “wheel/rail” contact zone [1]. The foreign scientists (USA) point out the necessity of quantitative assessment of the “wheel/rail” operation, especially in the curved tracks Focusing on such values as an angle of attack, the lateral and axial forces appear in the contact zone [6]. The analysis of the conducted researches showed that the numerical values of the friction coefficients on the lateral surface and track running surfaces (frictional condition) and their influence on the wheel/rail force interaction in the curved tracks have been insufficiently considered [7,8]
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