Improvement of the design modes of loading the frame of a freight car bogie

Abstract

In order to increase the cargo train movement speed, cargo wagons with single welded bogies designed for design speed of 140 km/h. In the process of design, the task was set to create a wagon and a bogie technically compatible with cargo wagons being operated and adapted to the existing technology of driving and formation of cargo trains. One of the important parts of the vehicle is the bogie, on which the wagon’s dynamic properties depend. During designing it is important to ensure strength of the structure, including against rare extreme loads that occur during operation. Proceeding from this task, calculation of frame strength by permissible stresses was conducted by regimes adopted in regulatory documents for cargo wagons. Requirements set out in state standard GOST 332112014 were used for ensuring and evaluating strength of a bogie’s structural elements. The paper presents an analysis of provisions of the current regulatory documents related to the Customs Union technical regulation TR TS 001/2011 which contain the methods for carrying out strength calculations by permitted frame loading of rolling stock bogies. Design modes are compared to requirements of European standards. Results of the study justify an additional calculation regime that is relevant in operation of cargo wagons with welded-construction from of wagon bogie. Design, calculation and evaluation of the construction accounting for the additional regime would permit increasing frame construction reliability in case of a wagon derailing. As part of the work, loading values produced by calculation model were compared to strain measurement results.