Abstract
The purpose of the work is to identifying causes of intensive lateral wear of rails and other track failures in short radius curves using numerical methods. The study has been conducted for the most common type of rolling stock: four-axle freight cars on TsNII-Ch3 bogies, transportation of which makes 75-90% of freight load of the track sections. Thus, it is the effect of these cars which is the main cause of the above disorders. To solve the problem, effect of the following parameters of the track plan on dynamic processes of interaction of the track and rolling stock was investigated in the work: effect of the curves radius, the unbalanced accelerations and the width of the track; effect of local joint and smooth irregularities of the track in plan view. The results of numerical studies. A mathematical model of the spatial dynamic system “vehicle-track” has been used to perform the study, which is based on the design diagrams of the track in the form of long rail beams resting on multiple dissipative elastic supporting sleepers with nonlinear characteristics. This model is implemented in the MathCAD software system.
Highlights
The sections of the track in short radius curves differ significantly from other sections by multiple technical failures, including lateral wear of the rails, derangements in plan view and widening of the railway track, the total length of curves with radii less than 400 m is about 2.5% of the total length of main tracks of the Ukrainian main railways.The main applicable regulatory document [2] is based on the quasi-static calculation method for the effect of vertical forces
The factor that mainly determines the dynamic processes during movement of a vehicle in the short radius curves, which have track irregularities in the plan, is the radius of the total curve
According to the results of the studies, if a total length of irregularity is 20 m and an amplitude is 23.3 mm, its minimum radius will be 217 m, and if these irregularities are in a circular curve of 300 m, the total curve radius will be 126 m
Summary
The sections of the track in short radius curves (less than 400 m) differ significantly from other sections by multiple technical failures, including lateral wear of the rails, derangements in plan view and widening of the railway track, the total length of curves with radii less than 400 m is about 2.5% of the total length of main tracks of the Ukrainian main railways. The effect of horizontal lateral forces, including in curves, on the value of normal stresses in the edges of the top and base of the rail is taken into account using correction factors depending on the type of rolling stock and the radii of the curves. The study has been conducted for the most common type of rolling stock: four-axle freight cars on TsNII-Сh3 bogies, transportation of which makes 75-90% of freight load of the track sections It is the effect of these cars which is the main cause of the above disorders. In the short radius curves, due to insufficient flexural stiffness of the joint pads, angleshaped indentations are present practically everywhere in plan view These “angles” vary from 0.20 to 20, depending on the type of joint pads (with four or six-bolt joint) and the bolt tension.
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