FEATURES OF INFLUENCE OF THE WIDTH OF THE RUT ON THE DYNAMICS OF MOTION IN CURVED SITES OF THE WAY OF SMALL RADIUS

The article considers the dependences of the influence of the track width on the resistance to movement of rolling stock in the rail track. When considering the dynamics of movement of the car, especially in curved sections of the path, it is necessary to represent the path as a complex geometric curve of the third order. The curve section of the path consists of: the end of a straight section (CP); a transition curve (PC); a circular curve (CC). The transition curve has the form of a clotoid, i.e. in the mathematical concept of a cubic parabola. On this site, at any speed value, there is a smooth increase in the centrifugal force. The smoothness of the force build-up ensures that the wheel enters the circular curve without impact. The basic law of ensuring the safe passage of the wheel on the rail is estimated by the maximum permissible amount of outstanding acceleration, which for freight cars is within the range of no more than 0.3 m / s 2. The main difficulty for the wheel is its passage at low values of the coefficient of friction of the ridge on the side surface of the rail. The given graphs of the curve radius dependence on the work of friction forces in the wheel-rail system clearly show the change in the qualitative and quantitative characteristics of the wheel–rail system. The arrangement of a rail track in a curved section of track assumes each radius of curvature its specific elevation of the outer rail. On this section of the curve for the safe passage of the car, it is assumed to provide the calculated track width to the value of 1535-1548mm. Thus, the device in the curved sections of the path is interconnected with the concept: speed; radius of the curve; elevation of the outer rail, widening of the track.