| Abstract [eng] |
In the first chapter has been overviewed movement of locomotives in curved track, occurred forces in rails and other factors which affects magnitude of stresses in rails. Also overviewed types of stresses and most dangerous defects which they cause. As well as has been analyzed equipment that is being used to measure stresses in rails at the moment with their advantages and disadvantages. In the second section, four curves and two types of the vehicles were chosen, and according to their technical characteristics digital analysis were done. Also, in this chapter were formed principal scheme, according to which forces were calculated for outside and inside rails of the curves. After calculating the forces, in Comsol Multiphysics environment 3D models were made according to chosen curves radiuses and rail types, rail materials were selected as well. Regarding to the results of digital analysis, parametrical analysis were done, where maximum speeds were calculated for explorative curves. In the final chapter, results from digital analysis were analyzed. Siemens locomotive’s results compared with rail car’s PESA, outside rail’s results compared with inside rail’s, conclusions were made about how size of stresses changes while changing radius of curved track, the speed of train or outside rail’s cant. Also results of parametrical analysis are being analyzed, which shows how axle load affects traveling speed of trains in curved track and how much this traveling speed could be raised in these curves for these types of trains. |
