Purpose. The article describes the process of developing the information-measuring test system of diesel locomotives hydraulic transmission, which gives the possibility to obtain baseline data to conduct further studies for the determination of the technical condition of diesel locomotives hydraulic transmission. The improvement of factory technology of post-repair tests of hydraulic transmissions by automating the existing hydraulic transmission test stands according to the specifications of the diesel locomotive repair enterprises was analyzed. It is achieved based on a detailed review of existing foreign information-measuring test systems for hydraulic transmission of diesel locomotives, BelAZ earthmover, aircraft tug, slag car, truck, BelAZ wheel dozer, some brands of tractors, etc. The problem for creation the information-measuring test systems for diesel locomotive hydraulic transmission is being solved, starting in the first place from the possibility of automation of the existing test stand of diesel locomotives hydraulic transmission at Dnipropetrovsk Diesel Locomotive Repair Plant «Promteplovoz». Methodology. In the work the researchers proposed the method to create a microprocessor automated system of diesel locomotives hydraulic transmission stand testing in the locomotive plant conditions. It acts by justifying the selection of the necessary sensors, as well as the application of the necessary hardware and software for information-measuring systems. Findings. Based on the conducted analysis there was grounded the necessity of improvement the plant hydraulic transmission stand testing by creating a microprocessor testing system, supported by the experience of developing such systems abroad. Further research should be aimed to improve the accuracy and frequency of data collection by adopting the more modern and reliable sensors in tandem with the use of filtering software for electromagnetic and other interference. Originality. The authors developed the information-measuring system that improves the hydraulic transmission test process by automating and increasing the accuracy of measurements of control parameters. The measurement results are initial data for carrying out further studies to determine the technical condition of the hydraulic transmission UGP750-1200 during the plant post-repair tests. Practical value. The paper proposed the alternate design of microprocessor hydraulic transmission test system for diesel locomotives, which has no analogues in Ukraine. Automated data collection during the tests will allow capturing the fast processes to determine the technical condition of hydraulic transmission.

Modern diagnostic systems are characterized by that the flow of diagnostic information requires significant computational resources to process. In order to improve the reliability of the object to be diagnosed and reduce operating costs, it is necessary to improve procedures for analyzing diagnostic results. This paper suggests a procedure to form the diagnostic features of locomotive nodes based on the use of a principal components analysis. The proposed approach is distinguished by a decrease in the dimensionality of the input set of diagnostic features in order to select the sets of interconnected diagnostic parameters. Based on the selection of the sets of interconnected diagnostic features, constructing new latent diagnostic parameters has been proposed. A latent diagnostic parameter contains information that combines data from several initial diagnostic features. The result of the method is a set of latent diagnostic parameters that do not correlate with each other and reflect the behavior of the object to be diagnosed from different technical points. The application of a sufficient number of latent diagnostic parameters involved the scree test method. This paper reports the results from using the proposed approach for treating the results from diagnosing the hydraulic transmissions in locomotives. The result from applying the procedure has made it possible to propose using three latent diagnostic parameters to assess the technical condition of a locomotive’s hydraulic transmission during bench tests. The suggested parameters contain 90 % of the original information and reflect losses in the transmission, as well as the load at the input and output of the transmission.

Purpose. The article is aimed to evaluate the influence of locomotives` operation and reliability indicators on the system of locomotives repair organization in depot, using the methods of queue theory. Methodology. The article describes the locomotive repair workshop using the terms and concepts of the queue systems theory (QST). The tasks solved during simulation of the repair workshop operation are formulated, the list of initial data and simulation results is given. A graphical simulation environment Simulink was used as a software simulation tool. Findings. It was established that the main indicators of locomotive depot operation are affected by the volume of traffic, the reliability of locomotives, the rule used to select locomotives from the queue, the number of operating repair bays. The developed model of the depot repair workshop will make possible rational planning of the repair workshop`s equipment use, the human capital, the time of putting the locomotives into repair taking into account the workshop loading uniformity, as well as to improve the repair parts supply logistics. This model in a simplified form describes the repair process of the main diesel locomotive fleet, and can be supplemented depending on the repair type performed in the depot. Originality. The paper presents the locomotive repair depot as an object of the queue systems theory. The simulation model of the locomotive repair depot was developed. It allows analyzing the influence of various factors on the system of locomotives` repair organization in the depot. Practical value. The obtained results make it possible to determine the influence of locomotives` operation and reliability indicators on the organization of the locomotive repair depot operation. In further studies, the developed model can be used to improve the system of repair organization on the railway network when introducing new series of locomotives and changing the strategy of their maintenance.Keywords: locomotive repair workshop; simulation; queue system theory; organization of the repair workshop operation ISSN 2307-3489 (Print), ІSSN 2307-6666 (Online) Наука та прогрес транспорту. Вісник Дніпропетровського національного університету залізничного транспорту, 2018, № 5 (77) ЕКСПЛУАТАЦІЯ ТА РЕМОНТ ЗАСОБІВ ТРАНСПОРТУ Fig. 2. Repair workshop model of diesel locomotives in the form of QS: 1former of the receipt time of locomotives for repair; 2block of the former of the application distribution in time; 3former of diesel locomotive service time at repair position; 4diesel locomotive repair positions; 5queue of locomotives waiting for repair ISSN 2307-3489 (Print), ІSSN 2307-6666 (Online) Наука та прогрес транспорту. Вісник Дніпропетровського національного університету залізничного транспорту, 2018, № 5 (77) ЕКСПЛУАТАЦІЯ ТА РЕМОНТ ЗАСОБІВ ТРАНСПОРТУ

Purpose. The main purpose of the work is to reduce the time for analysis and increase the efficiency of processing statistical information on assessing the locomotive fleet operation through the use of methods to reduce the data dimensionality. Methodology. To conduct the study, the methodology for constructing an arbitrary process index was chosen. Using the methodology allows selecting from the total set of parameters those components that are the most informative. Using the method of hierarchies analysis based on the obtained main components, it is possible to construct a single generalizing indicator. Findings. The approaches to improving the existing system of indicators for accounting the operation of locomotives were analyzed. The expediency of using dimensionality reduction methods to analyze the locomotive operation was substantiated. Using the method of main components, the most informative indicators of locomotive operation and the degree of their influence on the general level of traffic safety in locomotive economy, the implementation of the maintenance system are determined. The examples of the analysis of locomotive economy indicators using the proposed methodology, index of performance of maintenance system, traffic safety indices and operational safety in locomotive economy are given. The locomotive economy was analyzed through a joint review of the proposed integrated indices, as well as quantitative and qualitative indicators of the locomotive use. The difference between these indicators shows a deterioration or improvement in the traffic safety state, taking into account the volume of work performed. Increase in the operational traffic safety coefficient over the safety index shows a deterioration in the traffic safety state, despite a decrease in the absolute values of indicators characterizing the level of traffic safety in locomotive economy. Originality. For the first time, it was proposed to evaluate the traffic safety state in locomotive economy through the difference between the traffic safety and operational safety indices. Practical value. To analyze the operation of locomotive fleet, it is advisable to use the methods to reduce the data dimensionality. To assess the traffic safety state, it is more advisable to use the operational safety index, since it takes into account the volumetric performance indicators of locomotive economy.

Наука та прогрес транспорту. Вісник Дніпропетровського національного університету залізничного транспорту, 2013, вип. 3 (45)