Abstract
The process of implementation of new developments, in particular, new generation rolling stock holds a prominent place among the range of measures for organization of high-speed passenger rail transportation in Ukraine. The example of permission for use and the initial phase of work with interregional NRCS2 dual-mode electric trains produced by Hyundai-Rotem Corporation is the illustrative one in this context. Due to the detection of macro-cracks in bolster beams of the car body frames of these electric trains, namely in the areas of mounting of anti-yaw dampers, these trains were taken out of service until the completion of the modernization of problematic nodes. The comprehensive study on the determination of the safety parameters of electric trains was conducted to determine the causes of destruction of bolster beams. At the same time, bolster beams loading was estimated depending on the characteristics of anti-yaw dampers by means of computer simulation of the dynamics of motion of trailing and motor cars. The feasibility of selection of parameters for anti-yaw dampers mounted on electric train cars was assessed. The results of work will improve the safe operation of high-speed trains and increase the efficiency of estimates regarding the loading of bearing structures of underframes of the of rolling stock.
Highlights
The experience in operating НRCS2 electric trains in the conditions of Ukrainian railways showed their low reliability
Due to shortcomings in this system and omissions that occurred during testing and examination of technical documentation, within a short period of time starting from the beginning of operation of HRCS2 electric trains the number of failures of mechanical parts of cars was observed
Technical failures involve the destruction of bolster beams of car body frames in the areas of mounting of anti-yaw dampers attachments
Summary
The experience in operating НRCS2 electric trains in the conditions of Ukrainian railways showed their low reliability. According to the results of analysis of features of running gears construction, significant differences in design and characteristics of central spring suspension and other devices for cars coupling with bolster structure were found in Rostyslav Domin, Iurii Domin, Ganna Cherniak Estimation of dynamic performances of the safe operation of high-speed electric train comparison with standard technical solutions used in modern high-speed trains. The technical solution for mounting brackets for anti-yaw dampers is atypical Such brackets are usually mounted on longitudinal beams of body frames, whereas in NRCS2 electric train cars such brackets are mounted on bolster beams (Fig. 1). Specified significant differences in design and characteristics of central spring suspension and other devices for cars coupling with bolster structure that were found in comparison with the standard technical solutions used in modern high-speed trains did not get adequate justification at the stage of design works. The rationality of adopted technical solution in terms of the structure of attachment points for anti-yaw dampers remained unsubstantiated due to the lack of appropriate strength calculations
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