Assessment of the residual life of the contact wire of electrified railways.

Abstract

Abstract. Since the current state of the contact network of electrified railways of 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 article is devoted to solving the problem of determining the residual life of the contact wire (CW) of electrified railways. The purpose of the article is to develop methods for estimating the residual life of the CW of electrified railways using a probabilistic-physical model of reliability – DM-distribution of time to failure. The article analyzes the types of gearbox 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 wear. The permissible degree of gearbox wear has also been established. On the basis of experimental data, the residual life of the CW was determined. Developed and proposed criteria for assessing the residual life of the gearbox, allowing to reduce operating costs by increasing the overhaul interval. It is proposed to use a probabilistic-physical approach to assess the real technical condition and predict the residual life of products when there is no failure statistics. Within the framework 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 interpretation - the average rate of change of the determining parameter (validity criterion) and the coefficient of variation of the generalized degradation process. The article provides several examples of residual life calculations that demonstrate the use of two probabilistic-physical methods for estimating the residual life of the CW, namely, based on the results of controlled operation and on the statistics of failures and recovery of the CW. The calculated data obtained correspond to the current recommendations for the average frequency of the current repair of the CW sections.