Calculated estimation of railway wheels equivalent conicity influence on critical speed of railway passenger car

Juraj Gerlici,Tomáš Lack,Ganna Cherniak,Rostyslav Domin,M Vasko,A Sapietová,M Sága,L Jakubovičová,O Štalmach,V Baniari,M Blatnická,P Kopas,M Handrik

doi:10.1051/matecconf/201815703006

Abstract

The article presents the results of determining the equivalent conicity characterizing the geometric interaction of wheels and rails on 1520 mm track. The cases of interactions of rails and wheelsets, wheels of which have different profiles, are considered. The computer model of the motion speed of the passenger car is developed. According to the results of computer simulation, critical speeds for the bogie moving through the tracks of indented gauge are received. Based on the results of the simulation analysis, the significant dependence of the value of the equivalent conicity on the critical speed is confirmed. The necessity of considering the limit values of equivalent conicity in tests of high-speed rolling stock is emphasized.

Highlights

The increase of speed of passenger trains up to 160-200 km/h brings new technological level on the Ukrainian railways
According to the results of numerous studies, configuration of working surfaces of wheels and rails can significantly affect the dynamic behavior of rail vehicles, in particular, critical speeds in respect of hunting oscillations depending on the design and parameters of the running gears
The value of the increase in critical speeds depends on the used wheel profile

Summary

Introduction

The increase of speed of passenger trains up to 160-200 km/h brings new technological level on the Ukrainian railways. According to regulatory documents operating on the railways of the European Union, field tests on the admission of the rolling stock to operation must be carried out under certain parameters of interaction between wheels and rails, including those which reflect the conditions of the worn out surfaces in contact [5, 13] Such an approach was implemented to test the impact of natural wear of wheels and rails on the dynamic characteristics of the. The results of the relevant research proved that for certain units of the rolling stock critical speeds in respect of hunting oscillation are considerably sensitive to contours of the threads of wheels [3] Up to this day regulatory documents on running dynamic tests of rolling stocks for 1520 mm tracks do not envisage tests on the impact of the depreciation of wheels on the dynamic behavior of the rolling stock, which does not allow qualitatively assess of its running characteristics in real operating conditions [2]

Characteristics of equivalent conicity

Determination of critical speeds

Conclusion