Education of the republic of uzbekistan tashkent state technical university named after islam karimov

 
 
 
 
 

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№3/2021 year. 
Technical science and innovation
230 
UDK 629.463.23 
ANALYSIS OF METHODS FOR DETERMINING THE COEFFICIENT OF ADHESION 
BETWEEN THE WHEEL AND THE RAIL, WHICH AFFECTS THE TORSIONAL 
VIBRATIONS IN THE TRACTION OF MAINLINE LOCOMOTIVES 
 
Sh. I. Mamaev
1*
, A.T. Djanikulov
1
, O. T. Kasimov
1
, A. V. Grishenko
2 
1
Tashkent State Transport University, 
100167
, Tashkent, Uzbekistan 
2
 St. Petersburg State University of Railway Transport of the Emperor Alexander I, 190031, 
Saint-Petersburg, Russia 
 
Abstract:
 This article emphasizes the importance of efficient movement of rolling stock and the 
coefficient of friction between wheels and rails when using them. The factors influencing the 
friction of the wheel against the rails are considered. The spots formed under the action of 
vertical forces on the contact surfaces of wheels and rails were revealed. Contact spots and fiber 
shear were detected under the action of torque. The intermolecular forces of the fibers resist 
shear, resulting in shear stresses. These stresses, in turn, create a traction force applied to the 
wheel contact point and forces transmitted in the opposite direction. 
The analysis of dry friction, sliding friction and static friction in the contact zone is considered. 
Studies have shown that in order to increase the value of the adhesion coefficient, it is necessary 
to increase the contact surface area, increase the wheel diameter, the radius of the rail head 
surface, create a special tire profile, increase the tensile strength of wheel tires and rails, based 
on the fact that it can be achieved by preparing from existing materials. Was carried out 
according to the coefficient of adhesion. V.Ya. Naumov, N. N Menshutin, A. A Rengevich and the 
experiments carried out by the O. M Yansons were studied. As a result of these studies, the 
dependence of the coefficient of adhesion of the wheel to the rails on the speed of movement was 
considered. Accordingly, it has been found that the traction coefficient decreases with increasing 
speed.