DYNAMIC PROCESSES IN THE DRIVE SYSTEMS OF RAILWAY TRACTION VEHICLES IN THE PRESENCE OF EXCITATION CAUSED BY UNEVENNESSES IN THE TRACK

Abstract

SUMMARY Traction vehicles moving along a track go through excited vertical and pitching vibrations due to the vertical unevennesses in the permanent way. These vibrations give rise to variations in the axle load, and dynamic loads in each element of the drive system are created by the variations in the creep- and axle load dependent tractive effort transmitted through wheel-rail contacts. Service life and reliability of the expensive traction vehicles are considerably influenced by the variation in the dynamic load conditions of the drive system. The dynamic excess loads can be correctly described by the analysis of an integrated “track - vehicle - drive system” model. This paper deals with the dynamic processes of the drive system which is a part of a relatively extended “track - vehicle” system. In the course of the analysis, linear and non-linear system models are used. Our numerical examinations, carried out so far, show that linear system models can yield acceptable results only in the case of relati...