THE ANALYSIS OF EXISTING APPROACHES TO CALCULATING TRAFFIC SAFETY CRITERIA IN THE RAILWAY SECTOR
AbstractThe subject matter of the article is the methods for determining the safety parameters to prevent wheel derailment. The object of the study is the interaction of a rail track and rolling stock. The goal of the paper is to study of approaches that are used by domestic and foreign scientists to assess the protection against wheel derailment and to study the analytical conditions for the wheel flange rolling onto the rail top, which are the criteria of protection against derailment which are considered while expertizing the railway transport. The methods used in this work are the system, logical and historical approaches; analysis and synthesis, induction and deduction; modelling. The tasks of the article are as follows: to analyze the methods for determining the safety criteria from wheel derailment; to evaluate the importance of all methods and approaches, to identify their disadvantages and advantages, to make recommendations for improving the method of assessing the stability of rail vehicles on the railways of Ukraine. Results. The works of domestic and foreign scientists, which are devoted to the issue of assessing the protection against the wheel derailment were analyzed. It has been established that in order to approximate the results of mathematical modelling of rolling stock to the actual operating conditions, the task of the wheelset derailing from the track should be performed using dynamic equations of spatial oscillations. It was proposed to take into account the analytical conditions for wheel flange rolling onto the rail top, which were proposed by E. Sokol, the Doctor of Technical Sciences, when expertizing the railway transport. Conclusions. Most of the considered methods estimate the probability of a wheelset derailment without taking into account the influence of other wheelsets, which can lead to erroneous results. It has been established that in order to approximate the results of theoretical calculations to the experimental data, the problem of the wheel derailment should be solved using the equations of spatial oscillations of a rail car.
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