Abstract
The problems of railroad design technical reconstruction aimed at ensuring train protection in introduction of high-speed traffic on the rail lines have been addressed. The description of railroad technical system with certain specific features has been proposed. The pair of mutually dual problems regarding the optimal reconstruction of railway curves for raising train speeds at minimal capital investments has been addressed. The problem of determining the optimal speeds of trains of each category under optimum outer rail cant, increase of the unbalanced acceleration value, compliance with the condition of uniform load on rail tracks, comfortable carriage of passengers, in which reduced costs on increased speeds in curved tracks will be minimal has been formulated. To achieve the goals of the study, mathematical optimization techniques and algorithms of analysis of the rail lines of different nature are used. This, by finding and value engineering optimization, allows to minimize high-value and lengthy procedures of physical simulation. As a problem-solving technique, Lagrange multiplier method and its applicability have been proposed. Numeral solution to the problem of selection of certain stretches for increasing rolling stock speeds on operating lines without reconstruction or with minimum expenses on reconstruction of contour of track has been reviewed.
Highlights
One of the priorities of contemporary railway is raising train speeds on existing rail lines that is inseparably linked to assuring safety and comfortable carriage of passengers
The objective of this study is to find a common approach to solving two problems: – the definition of optimal values of design radii increasing the speeds of trains on existing lines at minimal cost of reconstruction and maximum travel time reduction, – the determination of optimal speeds of trains of each category with the introduction of high-speed traffic on existing railway lines with a change of the unbalanced acceleration value from 0,7 m/s2 to 0,9 m/s2 and minimal reduced expenditures
Increase in unbalanced acceleration to 0,9 m/s2 will not have significant impact on organism of a passenger, but it can substantially reduce travel time owing to faster running through a curve [10]
Summary
One of the priorities of contemporary railway is raising train speeds on existing rail lines that is inseparably linked to assuring safety and comfortable carriage of passengers. The economic growth has been accompanied by an increase in the demand for high-speed transport, especially railway one, as it provides citizens of the country with freedom of movement at minimal time expenses. Despite the relevance of the problem of the highspeed operation introduction, it is quite difficult to implement it. This can be explained by the lack of the rolling stock, range territory for researches, and regulatory framework, which has just being established. Theoretical foundations of designing express and high-speed railway lines without reconstruction or with minimal reorganization of existing lines are formulated by A. The method of determining the technical parameters of the reconstruction of the line for the transition to highspeed passenger trains in mixed freight and passenger traffic, taking into account the uncertainty of the initial information is given in the work [11]
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