STUDY OF OPERATIONAL PARAMETERS OF TRACK PROFILE ESTIMATION ON THE BANDWIDTH OF THE RAILWAYS
DOI:
https://doi.org/10.15802/stp2015/42165Keywords:
profile track, average rise, light elements profile, working part profile, detrimental fallsAbstract
Purpose. Obtaining suitable indicators for profile track classification (combining a diversity of its individual elements) to enhance the bandwidth of plots. Methodology. Analysis was done with polygon profiles. Rectified profile of each plot was grouped by the steepness of the elements within the increment of 1-2 %. For each plot was determined magnitude of the estimated rise and medium-sized rise on the working part of the profile. Longitudinal profiles were classified into four types by the magnitude of the proportion of light elements profile and estimated rises. Classification criteria are given for these four types of profiles with additional breakdown of each type into subgroups depending on the magnitude of the estimated rise. Findings.Researches proved that the maximum speed increasing on falls reduces the magnitude of the average fall and increases the proportion of the working profile. To test the proposed classification of profiles juxtaposition of freight trains time motion, calculated for real plots and by the corresponding typical profiles was carried out. Originality. Simplifying the calculations significantly, prevailing methods for assess profile track do not provide the full and accurate representation of the actual character impact of profile track at important tractional-operational and operational indicators. Conventional schemes do not accurately reflect the actual structure of track profiles, and therefore the use of them for concrete calculations can lead to wrong conclusions. Therefore, this classification of longitudinal profiles of the railway network becomes more important, which allow refer railway lines to a particular class upon longitudinal profile on the base of simple classifications marks and therefore use the tractional-operational calculations made for typical profiles in respect of certain lines. Practical value. Grouping of all explored plots by magnitude of average rise in the working part of the profile and analysis of the profile structure that is relevant to average rise, revealed that the proposed value of k is a simple, stable and specific indicator for the classification of the profile plot.
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