BAIDAK S. Rational curves parameters for the introduction of high-speed train traffic

The dissertation concentrated on develops theoretical foundation of science curve parameters definition and practical implementation of researching results at directions for the introduction of high-speed train traffic. There is analyzed technical condition of railway infrastructure availability of scientific support for the implementation of high-speed train traffic. Ensuring high values of train speed should be based on the availability of appropriate methodological and calculation and regulatory documents. The dissertation has received future development scientific approaches to estimating the parameters and condition of curves in the plan. An augmented system of criteria for assessing the state of curves that affect the accumulation of path violations in the plan. Recommendations on the differentiated use of various methods for capturing the line plan to obtain reliable information about the parameters and state of the curves for determining the maximum allowable speed are developed. Before reconstruction of railway lines for the introduction of high-speed traffic, it is necessary to conduct a field survey of the line plan with a full calculation cycle to confirm the curves. The solution of the accompanying problems at realization of mathematical model, such as definition of admissible speed in curves allows to carry out calculations in the automated mode and to define variants of increase of speed is received. The technique of determination of admissible speed in curves is offered and tested on real sites of railways allows to use results of calculations at a stage of planning of reconstruction of the railway or carrying out capital repairs of a track. Based on the calculation results recommendations are given on how to pay special attention to adjacent curves belonging to the category of dependent curves that means when the parameters of one curve affect the conditions of train movement along another. This conclusion is confirmed by the fact that the problem of speed in two thirds of cases is not related to the radius but to the length of the transition curves and direct insertions between adjacent curves. Theoretical and experimental studies of the force effect of rolling stock on the track, comfort and smoothness of train movement for various parameters of the curves are carried out. The experiment confirmed the theoretically established requirements for the content of the curves in the areas of high-speed movement. The method for determining the rational parameters of the curves differs from the previous ones in that it takes into account the current state of the track infrastructure, type and characteristics of the existing and future rolling stock, limited investment in projects and the railway life cycle. Applying the developed method allows to increase the speed on stages and stations at 18-25% and reduce the unit cost of electric power for traction 10-15 kW h/km, which contributes to the state assignments for energy savings.