ANALYTICAL DETERMINATION OF CRITERIA FOR SAFETY OF MOTION AT RAILWAY TRANSPORT
The research on rolling stock stability condition for derailment was carried out by many foreign and domestic scientists, each of them proposed its own methods and approaches to its calculation. Each of proposed methods and approaches has its advantages and disadvantages that are analyzed in detail. Besides the method of determining the stability margin coefficient for derailment of rolling stock is indicated in currently accepted norms for calculation and design of railcars track of 1520 mm, in European standards. However, calculations based on the norms that are used for railways track of 1520 mm do not give an opportunity to take into account the parameters of the rail track, namely the irregularities in both the vertical and horizontal planes that occur during operation. So, calculations of traffic safety criteria according to these standards do not allow to determine the effect of wear of wheel pairs and rail track. Moreover exceeding the permissible value of stability margin coefficient for derailment of rolling stock does not always lead to the rolling in of the wheel flange on the railhead. Because the ratio of vertical load to horizontal force can exceed the permissible value, but the gap between the wheel flange and the bar will not be exhausted. Check of stability conditions from a derailment of rolling stock on accepted by norms for model 11-286 car is executed. The basic lacks of the used method of calculation and ways of its improvement are resulted. Creation of mathematical models of railcars will allow to take into account main features of construction of running gears, wear of wheelsets, railtrack and determine the time when the gap between the wheel flange and the rail is exhausted (their dynamic interaction arises). We should also analyze the European experience in determining the criteria for traffic safety.
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