Science and Transport Progress

22-32

Authors: A. M. Beznarytnyy, V. I. Gavrilyuk, O. O. Gololobova

Purpose. Development of formalized description of automatic block system of numerical code based on the analysis of characteristic failures of automatic block system and procedure of its maintenance. Methodology. For this research a theoretical and analytical methods have been used. Findings. Typical failures of the automatic block systems were analyzed, as well as basic reasons of failure occur were found out. It was determined that majority of failures occurs due to defects of the maintenance system. Advantages and disadvantages of the current service technology of automatic block system were analyzed. Works that can be automatized by means of technical diagnostics were found out. Formal description of the numerical code of automatic block system as a graph in the state space of the system was carried out. Originality. The state graph of the numerical code of automatic block system that takes into account gradual transition from the serviceable condition to the loss of efficiency was offered. That allows selecting diagnostic information according to attributes and increasing the effectiveness of recovery operations in the case of a malfunction. Practical value. The obtained results of analysis and proposed the state graph can be used as the basis for the development of new means of diagnosing devices for automatic block system, which in turn will improve the efficiency and service of automatic block system devices in general.

51-58

Authors: Anna Golovkova

Purpose. The current rapid social and economic developments show mobility as the most important factor of economic growth, social and cultural progress. Mobile technology has undergone a sea change over the past ten years. The evolution of mobility is about creating better ways to change the world. It will increasingly shape our lives and thinking in ways we cannot fully anticipate. Mobile revolution is a global reality which creates new opportunities and challenges for all companies in the world. Methodology. Proposed methodological approach is based on a comprehensive assessment of the strategic impact of mobility on the organization as a major tool to improve competitiveness and efficiency of the company. During the research have been used both qualitative and quantitative methods. As a result, the article provides bridges between the field of mobility, organization science, information systems, and certain aspects of philosophy. Findings. This research provides a glimpse into the fast-evolving world of mobile technology and maybe even faster evolving world of organizations. The research is designed to understand the strategic impact of mobility on organizations, and evaluate the benefits of integration of these new technologies into the company. The research comprised of an extensive literature review, observation of existing practices, and semi-structured interviews geared toward understanding the strategic impact of mobility on organization and its employees. Originality. The research findings suggest three main strategic implications of mobility: (1) improve working process; (2) increase internal communication and knowledge sharing; and (3) enhance sales and marketing effectiveness. Practical value. The use of mobile technology and it impact on organizational change and strategy, stability and development of competitive advantage allow the company to ensure the effectiveness of its business. Mobility can dramatically transform the company by finding their feet in almost every sector and it has a profound impact on both customers as well as employees. Mobility solutions are growing across business portfolios of company and driving by the need to increase productivity. They improve decision making, with increased near real-time access through mobile channels that help to improve internal employee interaction, customer collaboration, network building and information sharing.

68-74

Authors: YE. B. Bodnar

Purpose. Justification of the basic principles of construction on-board diagnostic systems locomotive and choose from high-performance and reliable interface for the exchange of information on-board diagnostic systems. Methodology. Problem of getting correct and adequate information about the technical state of the technical object is solved with the use and compliance of the fundamental principles of modern computers. Findings. High-performance and reliable interface to exchange messages between different units of management systems and on-board diagnostic systems was selected. Properties which are required high data rate, high reliability and low error rate of information transfer. Originality. The main principles of building on-board diagnostic systems which ensure compliance locomotives accumulation of accurate and adequate information about the technical condition which is necessary to organize its maintenance and repair were formulated. Practical value. Diagnostic equipment designed with use of requirements set forth above and principles will affect the technical condition of the engine, increasing the likelihood of uptime, productivity and locomotive repair teams. The introduction of on-board diagnostic systems and stationary locomotives will significantly improve the system and optimize their maintenance costs of maintenance and repairs. Besides, information about diagnostic parameters changing accumulated with the aim of airborne systems will be used in order to create mathematical models that, in turn, will organize a system of maintenance and predict the technical condition of locomotives.

86-96

Authors: M. O. Kostin

Purpose. Theoretical justification of the "field" approach (based on electromagnetic field) to the transmission and losses of power in the devices of traction power supply systems and electric rolling stock. Methodology. The methods of electromagnetic field theory and, in particular, the theory and practice of electromagnetic energy transmission based on the concept of the Poynting vector and elements of the theory of propagation, reflection and refraction of plane electromagnetic waves were used. Findings. Theoretical studies of electromagnetic energy transmission from the traction substation to the electric rolling stock through dielectric (air) surrounding traction network: between the contact wire and the rail were carried out. It is proposed strategic designing "squat" (low) types of electric rolling stock. The components of electric energy flow through the roof of electric rolling stock and its frontal part of the body were estimated. This allows reliable etimating active power losses in electric traction system. To compensate the reactive power consumed by electric rolling stock, which is conditioned by standing waves, it is proposed (for extinction of the the last) to develop and put in front of electric rolling stock the layer of particular environment with the necessary parameters. Originality. The "field" principle of the power transmission analysis and its losses arising in electric traction system was first proposed. The laws of motion of electromagnetic energy flows through the roof and the frontal part of the body of electric rolling stock were established. Practical value. An expression of the absolute value of the Poynting vector in the points of dielectric (air) between the contact wire and the rail was obtained. This allows assessing the highest density of energy, which is transferred to the time unit and predicting the main dimensions of the unit of electric rolling stock. The energy indices of the roof of electric rolling stock, through which penetrate the electromagnetic waves during energy transferring were numerically evaluated.

105-111

Authors: T. M. Kadilnikova, L. F. Sushko

Purpose. During operation of cold-pilgering mills rotation of the shafts is carried out by means of pinion gears being in meshing with stationary gear racks, which is accompanied by various tribological defects, that can be avoided during the detailed investigation and justification of selection and evaluation of kinematic and tribological characteristics of the system "pinion - gear rack". Methodology. Runout occurs as a consequence of increased friction and depends on the material hardness of which pinions and toothed racks are manufactured, their thermal treatment, selection of correct lubrication, insufficient oil purity and its untimely change, gears overload and other factors. To assess the runout of tribological pair cogs "pinion - gear rack" of the cold-pilgering mills we will use a system of differential equations of the first order. Using the solution of this system under the given conditions, it is possible to obtain relations for kinematic and tribological parameters. Findings. Relations for the durability, runout, sliding speed, and length of the line of the tribological pair "pinion - gear rack" contact are obtained. They provide high indicators of runout and durability of the system with minimum weight and overall dimensions of the design, which is an important factor to increase efficiency of cold-pilgering mills. Originality. The analysis of the relations, which was obtained to identify durability, wear, sliding speed, and the length of the line of the tribological pair "pinion - gear rack" contact allows you to choose for cold-pilgering mills special pinions with the design parameters, which optimally satisfy the technological conditions of rolling. Practical value. Analytical determination of the slip velocity for tribological pair makes it possible to adjust the technical process of cold-pilgering mills and to make constructive changes in the system of "pinion - gear rack" in order to increase its wear resistance.

125-131

Authors: S. V. Raksha, A. S. Kuropyatnik, A. A. Kurka

Purpose. Formation of recommendations about rational profiling of ropeways taking into account energy saving. Methodology. As criterion of power consumption the specific power of the drive as the relation of power consumption to ropeway carrying capacity is accepted. The cycle of movement of cars was conditionally divided into three stages, characteristics of each one were kinematic parameters of the ropeway. Specific power for all cycle was determined as the sum of the corresponding values by movement stages. Findings. The conducted researches showed that the specific power of the drive doesn't depend on kinematic parameters of the ropeway. Limit value of specific power of the drive doesn't depend on road length. With increase in capacity of cars influence of length of flight on specific power are decreased. For big length ropeways it is recommended to carry out selection of heights of supports according to features of a relief for providing minimum possible gradient of spans. Use of high-capacity cars is expedient at a ropeway construction on the district which relief is characterized by essential height differences. Long spans should be carried out as much as possible acclivous, overcoming height differences via small length spans. Originality. The new criterion of estimation of power consumption of ropeways was formulated. Practical value. The use of the received results and the formulated recommendations will allow designing ropeways with the lowered power consumption.

142-150

Authors: N. B. Mankevych

Purpose. To analyze the results of the study of dynamic parameters of a gondola car, model 12-1704-04 with axle load 23.5 ton in bogies, models 18-1750 and two gondola cars, model 12-1905 with axial load of 25 ton, one of which is equipped with bogies, model 18-1711 with friction wedges of spring suspension with spatial form with increased angle to the horizontal line of intersection of the contact surfaces between the wedge and bolster, the other gondola car, model 12-1905 is equipped with bogies of the same model on which the friction wedges fitted with a flat form of contact surface. It has an angle of inclination like a wedge of bogie, model 18-100. On the basis of the obtained results to draw conclusions about the feasibility of unification design bogie bolster, model 18-1711 with bogie, model 18-100 by contact surfaces with elements of spring suspension. Methodology. Research on dynamic performance of cars was performed during running dynamic tests of specimens of freight cars in experimental train consisting of two locomotives, a laboratory, and three gondola cars of the above mentioned models. Findings. Main results of dynamic studies are presented as graphs of indicators on the speed of the train and the experimental evidence that the freight gondola cars on bogies, model 18-1711 with flat-shaped wedges, in most cases are better than the others. Originality. Research results of cars on bogies, model 18-1711 were obtained. They let assess the dependence of the dynamic performance of the car from the design of the friction wedges of spring suspension. Practical value. Cast parts of bogie, model 18-1711 with 25 ton axle load can be used as a replacement of defective parts of bogie, model 18-100 and its analogs.

160-166

Authors: V. Artomov, A. Raspopov

Purpose. The article analyzes the railway load LM71 for the purpose of its application in national design projects of the railway girder bridges. Purpose of the article is harmonization of national design codes of enginnering structures with the European standards (Eurocodes). Methodology. Analytical calculation methods (influence lines), the matrix analysis and computer programming are used in the article. Findings. Deflected mode parameters of the railway bridges under the influence of loads C14 and LM71 have certain differences. The extent of these differences depends on length, material of drift structures and also on dynamic coefficients. These dependences should be considered in national design codes and in harmonized with Eurocodes standards. In the further researches relationships between load C14 and models SW, HSLM taking into account various dynamic effects and trains speedis planned to determine. Originality. The presented results, in particular deflected mode parameters (including loads with dynamic coefficients), obtained for the first time. Practical value. Results of research are used in National Annex to the National Standard of Ukraine NSTU-N B EN 1991-2:2010. Eurocode 1. Actions on structures. Part 2. Traffic loads on bridges (EN 1991-2:2003).