Abstract
The problem of the interaction of rolling stock with the rail track has been analyzed in the present paper. It has been established that in the process of transport science development a number of methods for determining the causes of wheel pairs derailment are developed, which, in a varying degree, take into account the peculiarities of their interaction. The problem of choosing the most accurate method for estimating the causes of rolling stock derailment becomes more complicated because of the lack of sufficient experimental data that would allow us to verify the adequacy of the models. The indicators of stability of the wheel against derailment, which are used on the railways of Ukraine and Europe, have been examined. Their dependences on the speed of movement were derived. It has been established that the increase of the speed of motion leads to the increase of the interaction power of the rolling stock with the rail track, which may, under certain operational parameters, provoke its derailment. As a result of the calculations, it has been shown that the use of norms for car design and calculation used on Ukrainian railways can lead to an inadequate estimation of traffic safety parameters, since it does not take into account the unevenness of the railway track. It has been established that the requirements of BS EN 14363: 2005 European norms are stricter in comparison with the norms for calculation and evaluation of the bearing elements strength and dynamic qualities of motor-vehicle rolling stock used on Ukrainian railways. A comparison of the experimentally and theoretically calculated values of the stability margin coefficient against wheel derailment of the first wheel pair of the diesel train car was carried out.
Highlights
The most important problem on rail transport is to ensure the safety of train movement during operation
To approximate the results of mathematical modeling to the real conditions of operation, it is proposed to calculate wheel pair derailment because of the wheel rolling onto the head of the rail, using the dynamic equations of spatial oscillations of the car arising from the geometrical unevenness of the track in the horizontal and vertical directions
To obtain a spatial mathematical model that will be used to determine the dynamic characteristics of the criteria for the probability of wheel pair derailment, an analysis of the design of the diesel train car was made and its spatial mechanical model was adopted [22]
Summary
The most important problem on rail transport is to ensure the safety of train movement during operation. Rolling stock derailment is due to the loss of the interaction of at least one wheel of the rolling stock of the railway transport with a rail as a result of the displacement of the wheel from its normal position relatively to the rail head [1]. During movement of the wheel along the rail, vertical and horizontal forces occur, which cause the wheel flange to press on the head of the rail. Theoretical studies of the power interaction of this diesel train with the rail track, as well as theoretical determination of the level of safe operation with the help of the coefficient of stability margin of the wheel against derailment have not been carried out
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