Оцінка залишкового ресурсу контактного проводу електрофікованих залізничних доріг

Abstract

Since the current state of the contact network of electrified railways in Ukraine does not meet the requirements for ensuring the reliable operation of high-speed trains, the article proposes to improve the quality of service (control and repair) of the contact network in order to timely identify problem areas, thus contributing to the prevention of accidents on the railway. The arti-cle is devoted to solving the problem of determining the residual life of the contact wire (CW) of electrified railways. The article analyzes the types of CW wear and defines the main defining parameters. It is proposed to use the residual height of the section and the area of the worn part of the CW section as the determining main parameters of the wear. The permissible degree of CW wear has also been established. On the basis of the experimental data, the residual life of the CW was determined. In the paper, there are proposed and developed criteria for assessing the residual life of the CW that allow reducing operating costs by increasing the overhaul inter-val. It is offered to use a probabilistic-physical approach to assess the real technical condition and predict the residual life of products when there are no failure statistics. Within the frame-work of the probabilistic-physical approach, a probabilistic model (DM-distribution of failures) is involved in the assessment of durability, the parameters of which have a physical interpreta-tion – the average rate of change of the determining parameter (validity criterion) and the coef-ficient of variation of the generalized degradation process. In addition, the article provides sev-eral examples of residual life calculations that demonstrate the use of two probabilistic-physical methods for estimating the residual life of the CW, namely, the ones based on the results of controlled operation and the statistics of failures and recovery of the CW. The obtained calcu-lated data correspond to the current recommendations for the average frequency of the current repair of the CW sections.