Method of calculation of dynamic strength of frame structures of locomotives of complex configuration for transport engineering

This article proposes a new generalized analytical and numerical method for calculating the dynamic strength of the load-bearing frame of a locomotive frame of complex configuration, assuming its vibrations according to a beam-type scheme with elastic pinching of the ends under the action of a harmonic load, when an electric locomotive is moving along a track with periodic butt irregularities, at increased speeds. The following is a calculation algorithm and a flowchart for modeling the stress-strain state of the load-bearing frame of a locomotive frame of complex configuration in the form of an elastic rod of variable cross-section with variable mass, bending and longitudinal stiffness. The results of a numerical study on the stress-strain state of the load-bearing frame of the locomotive body frame are presented, taking into account the installation of reinforcing linings during modernization, and the results of a mathematical model of the locomotive body frame of complex configuration are compared with a model constructed using the finite element method in the Solid Works software product. Taking into account the results of experimental studies during full-scale dynamic tests of truck frames and main body frames of VL-80s electric locomotives when moving along a rail track under various loading conditions, a scientific justification is being carried out for the modernization of truck frames and main body frames of this type of locomotive during major repairs. An engineering method of analytical and numerical calculation is proposed, which allows for quasi-static and dynamic modeling of the stress-strain state of the main body frame and locomotive bogie frames with an upgraded reinforced load-bearing frame, based on numerical calculation programs for which 2 certificates of official registration of the computer program of the Republic of Uzbekistan have been obtained (No. DGU 07664, 04/31/2020 and No. DGU 10286 dated 02/24/2021).