SPECIAL FEATURES OF OPTIMIZATION DESIGN AND EVALUATION OF TECHNICAL RESOURCE FOR TRACTION GEAR TRANSMISSIONS OF RAILWAY ROLLING STOCK

Abstract

The article highlights the peculiarities of optimization design for traction gear transmissions of railway rolling stock, aimed at determining the main structural parameters of corresponding paired gears and toothed wheels to increase their technical resource. The recommendations provide a formalized description of such investigations in the form of multidimensional optimization problems with constraints. Significant attention is given to the selection peculiarities of main variable parameters, primary criteria (related to reducing wear on tooth contact surfaces), and secondary numerical criteria (corresponding to functional constraints). The displacement coefficients of the gear and toothed wheel are considered as the main variable parameters, with a decisive impact on engagement parameters and characteristics. The main criterion, taking into account the focus on increasing the technical resource, is the minimization of the difference between the maximum coefficients of specific sliding on the feet of the lateral profiles of contacting teeth. Numerical functional constraints correspond to general design conditions for manufacturing and meshing of gear elements. The article elucidates the peculiarities of searching for optimal solutions using available generalized mathematical models that describe changes in the main criterion and existing functional constraints based on selected main variable parameters. It is also recommended to use constructed blocking contours based on these models to define the region of admissible solutions and find the corresponding optimization solution. For each variant of structural parameters of the paired gear and toothed wheel found during optimization design, the article suggests evaluating the respective changes in the technical resource according to the provided recommendations. The article presents the results of a comprehensive study of traction gear transmissions in various series of locomotives and electric trains, including assessments of increased technical resource achieved by using paired gears and toothed wheels with specified design parameters obtained through optimization design.