Research of Railway Track Parameters in the Plan Based on the Different Methods of Survey

Abstract

Purpose. The main purpose of this paper is to analyze the existing methods for surveying curves in a plan, to study the influence of the errors in measuring plan parameters on the permitted speeds of motion, to develop re-commendations for reducing road disturbances by bringing the parameters of curves to the standards that operate in Ukraine in the directions of accelerated and high-speed train traffic. The problem of restructuring the curves was not so acute until there was a need to increase the speed of motion and technical condition monitoring of the track plan. Unreliable determination of the curves parameters leads to unjustified restrictions in the speed of motion or to large volumes of straightening operations. Methodology. The methodology used in the paper provides for a comprehensive and detailed study of different ways of railway curves survey, aimed at developing and obtaining the optimal solutions for the railway track plan. To date, there are different methods of survey the actual geometry of the railway track. To carry out research in various sections of complexity and for a long time of the railway track operation, the most convenient, first of all, considering the regularity of arrivals, there is a tape of the track-measuring car. However, this method is used to assess the state of the railway track, and not to determine the exact geometric position. Thus, when trying to determine the actual outline of the track unevenness using a track-measuring tape, a number of difficulties arise. When forming a mathematical model of the existing plan, the assumption is used: it is considered that three adjacent points on the curve are located along the circumference. The work of track renewal trains is based on this principle. As a result of track renewal operations with the aim of reducing the volume of flattening, the curve does not correspond to the initial passport data. Findings. The results of the work come out of the analysis of different approaches and methods of surveying the plan of the line, the parameters influence of the curves on establishing the permissible speed of motion. The recommendations received in the work will help to increase the efficiency of design decisions and the quality of railway track reconstruction as a whole. Originality. Scientific approaches to assessing the state of curves, studying the influence of their parameters on the permissible speed of trains, have been further developed. The system of criteria for assessing the state of curves that affect the accumulation of track disturbances in the plan is supplemented. Practical value. The results obtained will be useful for carrying out measures to improve speed, improve the smoothness of train traffic and the level of travel comfort on curved track sections, especially in the areas of accelerated and high-speed train traffic.

Railway Track Representation in Mathematical Model of Vehicles Movement

“…Научная новизна. Расшире-національного університету залізничного транспорту, 2017, № 6 (72) ЗАЛІЗНИЧНА КОЛІЯ doi 10.15802/stp2017/118380 © M. B. Kurhan, D. M. Kurhan, 2017 ны подходы представления железнодорожного пути в моделях подвижного состава, описанных системами уравнений по принципу Лагранжа-д'Аламбера. Разработана методика определения характеристик железно-дорожного пути для таких моделей по результатам вариантных расчетов динамического прогиба рельса от прохождения колеса.…”

“…The use of such an approach for modeling the operation of a railway track construction may take place, but for the most tasks it should be considered inappropriate. One can divide a railway track into integral objects with a constant mass on-національного університету залізничного транспорту, 2017, № 6 (72) ЗАЛІЗНИЧНА КОЛІЯ doi 10.15802/stp2017/118380 © M. B. Kurhan, D. M. Kurhan, 2017 ly conditionally. Moreover, these masses will have small displacement values, which will occur in a short period of time.…”

Testing the Positioning Accuracy of GNSS Solutions during the Tramway Track Mobile Satellite Measurements in Diverse Urban Signal Reception Conditions

“…This means that this method can meet the accuracy requirement of the irregularity measurement of the high speed line [27,28]. In subsequent studies, multi sensors were used, including GNSS, inclinometer, the Inertial Measurement Unit (IMU), laser scanner and odometer, for determining railway irregularity [29][30][31][32][33]. Research has shown that GNSS measurements, which are supported by other sensors, allow one to determine track irregularity with an accuracy of less than 1 mm, and thus they meet all technical requirements in this regard.…”

Application of Least Squares with Conditional Equations Method for Railway Track Inventory Using GNSS Observations

“…At other research centres, analogous studies were also undertaken to integrate tacheometric and GNSS surveys [ 26 ], with measurement support through the application of inertial navigation systems (INS) [ 27 , 28 ] or the application of mobile laser scanners [ 29 , 30 ]. In addition, studies were conducted to apply multisensor methods [ 31 , 32 , 33 , 34 , 35 , 36 ].…”