Sapronova S. Teoretical justification of forming and optimization of locomotive wheels maintenance profiles during the operation life cycle

The thesis is devoted to the creation of scientific bases of formation and maintenance optimization of locomotive wheels profiles in order to increase the operational life cycle and reduce the cost of maintenance, repair and replacement of locomotive wheelset tires. There has been grounded the interaction and obtained a new motion of stability characteristics depending on the wear parameters of wheel flange locomotive elements turnout and speed. There has been worked out a mathematical model of the locomotive motion on the straight and curved sections of track and turnouts. There has been gotten the criterion for safe driving over the edge studs of the turnout. A graph-analytic modeling method of forming worn profiles of wheels and rails has been counted, which based on new profiles allows to predict possible worn profiles of bearing surfaces with given final parameters of wear. A new approach to the choice of locomotive wheels repair profiles based on the optimization of the minimum unit operating costs per unit life cycle of tires has been calculated. A new method for restoration of bandages rolling surface has been worked out. There has been presented the development of automated system for monitoring wear ridges of locomotive wheel-set tires using computer technology to produce of locomotive wheels repair profiles, calculating, sampling, editing, storing and transmitting information about the wear surfaces of rolling wheels. There has been gotten the techno-economic effect, which reduces the cost of maintenance, repair and replacement of locomotive wheel-set tires. Key words: operational life cycle, locomotive wheel sets tires, crest, fixed dynamic interaction, traffic safety, geometric profile parameters, turnout, wear intensity, shaping, methods of turning tires.