Search results

The article devoted to results of the longitudinal multiplicative perturbation effect from railway track in relation to rolling stock.There is the technique for finding of difference type Raman resonances areas,which based on the theory of division in slow and fast components for motion of dynamic system.It proves a fact that the RMS-velocity for motion of the train is not a specific numerical value,but that is an area for which the width depends on the multiplicative factor driving

The article deals with the organization of operation when using cryogenic technologies for gas locomotives and isothermal cars (IV). The structure of transportation of perishable goods (SPG) by types of rolling stock and types of cargo and the peculiarities of transportation of frozen fish from the Far East to the central regions of the country is presented. On the example of their consideration, a new structure of the type of isothermal rolling stock (IPS) is proposed, including various types of single isothermal cars, large-capacity refrigerated containers and swap bodies. It is proposed to use the block-modular principle of forming energy refrigeration equipment for promising autonomous refrigerated cars (ARC). A review of promising ARC models developed by UralVagonZavod and Altayvagon, ready for serial production, has been carried out. The factors that should be taken into account when creating an innovative isothermal rolling stock are formulated. Variants of using cryogenic technologies for an autonomous refrigerator car and single insulated cars are considered. Based on the results of previously conducted operational tests of autonomous liquid nitrogen cars, the main their advantages and possible areas of use are given. The technology and technical solutions for improving the design of the cooling system of the cargo space for thermos cars cooled with liquid nitrogen have been substantiated. The calculated characteristics of the consumption of liquid nitrogen during the transportation of frozen goods are presented. The advantages of using environmentally friendly liquid nitrogen cooling systems are analyzed and the areas of using cryogenic technologies for isothermal rolling stock are formalized. Uncertainty and spontaneity of the perishable goods transportation market, along with the absence of a large customer, poses a difficult task for car builders to organize serial production of isothermal rolling stock with small production volumes and various technical characteristics. Therefore, when creating isothermal and refrigerator cars, it is advisable to focus on a single universal car kit based on an isothermal body with the possibility of transforming it by using various options for energy refrigeration equipment and chassis.

The article is devoted to the definition of rational overhaul runs equipment of locomotives. This has an impact not only on the reliability of the rolling stock, but also on safety. As a method chosen for the implementation of this task, the functions of the failure rate are used, with the subsequent construction of the functions of resource distribution and determining 90 % of the resource of the equipment of electric locomotives. The proposed technique allows you to determine the rational timing of maintenance and repair of locomotives in the specific conditions of their operation. The calculations are based on information about changes in the technical condition of the wheel-motor block of VL10 electric locomotives.

The article shows the relevance of applying the method of mutual test load of asynchronous traction motors of railway rolling stock. On the basis of the recommendations of existing standards in testing of asynchronous motors is made up of a sequence of acceptance testing of asynchronous traction motors provided in the form of an algorithm. In line with the scheme proposed for testing procedures on the use of the basic equipment of the circuit. The analysis of the main types of tests, the comparison of the classical means for testing the functionality of the inverters eliminated the need for additional DC sources in determining the resistance of the stator windings, additional brake and step-down transformers during short circuit and experience to carry out simultaneous testing of two induction motors increased speed at the stand of mutual load.

The article presents the results of the study of the influence of deviations of certain design parameters of bogie from established normative values on a relative offset from the crests of wheel pair in mezhdurelsovom space of railway transport. Such deviations occur in the process of the gradual wear of moving parts in real-world conditions of rolling stock and lead to a change of kinematic parameters of bogie. An analysis of dependence of lateral displacement relative to the wheelset of railway track from the difference between the diameters of the tapered surfaces of wheelset, skating from lack of alignment of wheelsets and difference coefficients rigidity of springs of bogie. The proposed mathematical model allows to not only diagnose technical condition of wagon bogies during their movements on the straight section of railway track, but also forecast the rolling stock maintenance dates the whole on the basis of position measurements of wheel pairs regarding railway track.

The article assesses the state of the market of transport and cargo services in Uzbekistan, considers the problem of scientific justification of the rational placement of cargo facilities in the country. Analysis of the problems of transport services has shown that freight traffic flows have spread out, negative trends have manifested themselves in the form of regular growth in the cost of fuel and energy resources, tightening of regulatory requirements, growth of customs duties, sanctions in the form of cancellation of previously introduced benefits, and more. However, such indicators of rail freight transportation as the range of container transportation and average travel time are stable in rail traffic, i. e. the diversification of the cargo base and the tendency to full capacity utilization take place. Separately, it should be noted that rail transportation interacts with other transport industries - automobile, air, sea, river and other modes of transport - as partners, not as competitors - multimodal freight transportation is widely developed, special logistics agencies operate to ensure the organization of uninterrupted work during freight transportation. Uzbekistan's railways need to be reformed, and possibly restructured. At least, private capital funds are already being attracted to the system of private carriage operation. The article describes the scientific methods of analysis and synthesis, classification, mathematical statistics used in the study. A roadmap of qualitative transformations for the reorganization of the transport and cargo industry has been proposed, which will bring positive results for the transport infrastructure as a whole.The results of the study will further reveal the capabilities of terminal networks capable of providing in a short time the delivery of large volumes of necessary cargo to domestic and foreign markets, the uninterrupted functioning of the necessary infrastructure for the placement of cargo facilities on the railway network. The object of the study is the state of transport infrastructure with a decisive role in trade.

The main subject of this article is consideration of the possibility of applying in electric circuit of the diesel locomotive hybrid power sourse, thats consists of diesel internal combustion engine and traction energy storage (li-ion accumulator battery). The main target of this work is to describe the effectiveness of the applying Li-ion energy storage in traction and diesel internal combusion engine start modes. At the same time, the regular used lead-acit battery is excluded from the locomotive circuit and replaced by a traction accumulator battery. By using numerical simulation methods, the article considers the possibility of starting a diesel internal combustion engine with a traction li-ion accumulator battery and possibility of the increasing the torque of electric traction motors and technical characteristics of the locomotive when the li-ion traction accumutalor battery is turned on as an additional source of energy. The relevance of the results is to get data about increasing carrying mass of the train when using a hybvid energy source on a diesel locomotive. The results of the work demonstrate the effectiveness of the use of a traction battery it traction and engine start modes, while improving the performance of the locomotive. The conclusions of the work contain an analysis of the results of mathematical modeling of the use of a traction battery.

In the article it is developed a model for the locomotives life cycle managing in their maintenance and repair using automated technical diagnostic systems. Based on statistical analysis of data on the operation of locomotives, the impact of the reliability of the locomotive and its maintenance and repair system on the efficiency of locomotives is theoretically justified. A method of analyzing the technical diagnostic systems effectiveness using the mathematical apparatus of information theory and of predicting the duration of maintenance and repair time with the dynamic use of accumulated statistics on the duration of previous repairs has been developed.

Low-density railway lines (LDRL) make up almost 1/5 (15,353 km) (18.2 %) of the total length of Railways of JSC "Russian Railways". Currently, the operation of LDRLs in countries of Europe and in Russia is very expensive. This is due to the large number of manual management operations and the excessive need for staff. The solution to the problem of efficiency of use of LDRL in the conditions of market economy is one of the priority tasks facing the transport industry. Despite the fact that LDRL are poorly loaded (on average 3.5 pairs of trains per day) and, therefore, unprofitable, their content is subject to almost the same requirements as for the mainlines, including reporting requirements. The stationmaster and staff of LDRL are overloaded the reporting documentation. This requires the performance of work on the revision of the technology, standards of service and operating procedures LDRL. The purpose of the study is to reduce costs for the main types of activities by changing the technology of maintenance and operation of LDRL. The subject of this study is the operation and maintenance of the LDRL network of JSC "Russian Railways". The methodology of the conducted research is based on the system analysis and scientific generalization of domestic and foreign experience in operation and maintenance of LDRL. The article highlights the technological features of operation of the LDRL. The classification of lines with low-intensity traffic has been developed and the criteria for their assignment to the proposed types have been determined. The peculiarities of the organization of movement of trains, passenger and freight work for the LDRL of various types are presented.

In the practice of railway transport and the locomotive complex, the average statistical data used in practice are not homogeneous, which is usually called “average temperature in the hospital” in the literature. The homogeneity of data is determined by their unimodality, i.e. the presence of one process in the sample. Unsuccessful sampling leads to its bimodality and even multimodality. It is proposed to check for unimodality of the initial data using the consequence of the law of large numbers, according to which, with an increase in the number of data, homogeneous samples tend to one of the distribution laws of a random variable: normal, exponential, lognormal, or another known law. Therefore, any unimodal sample must meet the goodness-of-fit test, which the article proposes to use the Pearson test (“chi-square”, χ2). The unimodality of the data is proposed to be estimated through the probability of compliance with the law of distribution of a random variable chosen for consideration, considering the probability of more than 0.3 (30%) to be sufficient. On the example of locomotive operation data and on-board microprocessor systems data, data are shown that cannot really be unimodal, but there is data that requires changing the sampling rules to achieve unimodality. For example, when considering the average daily runs of locomotives by series at specific home depots with participation in one type of traffic (main traffic, shunting or switching work), unimodality is achieved. An attempt to enlarge the data (take several series, several polygons, etc.) leads to the loss of unimodality. The article considers the unimodality of these on-board microprocessor control systems MSU-TP for diesel locomotives of the 2TE116U series. The expected operating time for the positions of the driver's controller turned out to be multimodal data. Unexpectedly, the current of the traction motors turned out to be unimodal, regardless of the driving position of the driver's controller.

The article describes how the inclination angle of a pole affects the position of contact wire relative to the level of the rail head. It is proposed to take into account a change in position of supporting constructions on the static parameters of catenary in high-speed Railways.

A study of the influence of non-linear parameters spring of a freight car suspension (stiffness spring, length base of a bogie, roughnesses railway) on the amplitude and phase fluctuations bouncing body is completed. Defined own vibrational frequency jumps car body as a function of the parameters.

The article discusses the control systems for mechanical vibrations on the basis of improved modernized nonlinear inverse dynamics algorithms and its use for vibratory stands of technical diagnostics to diagnose mechanical products of railway transport systems.

Development of innovative methods and hardware gives additional opportunities for the solution of various tasks. For example, innovations allow increasing safety in places of crossing highways and railroads by means of detection methods of objects in the required control zone. The big risk of emergencies in places as a railway crossing is caused by a high speed and the inertial movement of the train. In this connection, there is no possibility of timely braking of the train and prevention of collision with an obstacle. At the present time, the biggest percent of accident rate belongs to uncontrollable railway crossings. On such railway crossings completely are absent the blocking means or the warning technical tools. Controlled railway crossings are equipped with the blocking means for the automobiles. Also, they are equipped with the systems of video supervision. But the current systems of video supervision have no function of informing the driver of the train in an emergency. Therefore, to priorities belongs development of technical requirements for a hardware and software system. The automatic analysis of a dynamic situation in borders of a railway crossing, transfer to the driver of the approaching train of the required information belongs to priorities too. This work describes briefly main algorithms of computer vision which allow distinguishing any object on a railway crossing. The example of algorithmic modeling of detection of contours and allocation of a background on video has been considered in this work. Received results led to the conclusion about a necessary adaptation of modern computer vision algorithms for the solution of a detection problem of various objects with the required accuracy and in various working conditions.

The article deals with the organizational features of the Federal law of the Russian Federation on "transportation security compliance requirements to ensure transport security objects (buildings, structures), not related to transport infrastructure objects and located on land adjacent to transport infrastructure objects in the security zones of land transport. Systematized the activities required for the implementation of such transport facilities. In the work used techniques of systems analysis, comparative method, methods of theoretical knowledge (formalisation), obshhelogicheskie methods and techniques of research (analysis, synthesis, classification, the analogy).

This article describes the approaches to extract from the video sequence of areas relating to movable objects, which may cause a dangerous situation at a railway crossing. The proposed approach will improve the quality of the mobile object allocation, which will reduce the time image processing to identify moving objects in order to determine the degree of risk. To assess the quality of algorithms was develop a software product and simulated motion capture.

The article describes a method for controlling electrical loads rail consumers using energy storage. Different types of energy storage devices used in rail transport were considered. Performed the optimization problem formulation, selected criteria and the method for its solution. As an optimization method used the method of Hooke-Jeeves. A method is proposed to determine the optimal parameters and the optimal control law of charging and discharging of the energy storage. The criteria and calculation expressions that can be used in the design and feasibility study of the effectiveness of implementation of the stationary energy storage for managing schedules loads rail consumers. The mathematical expression was proposed for the energy storage capacity determination. Two criteria were considered in the optimization problem: a minimum active power losses and minimum reduced costs, and a comparison of results. The form factor used to evaluate the changes in electrical loads. Control of reactive power in the AC mains can realize using semiconductor converters and an energy storage. As a variant the electrochemical cells (lithium-titanate batteries) could be used as energy storage for rail electric consumers. As a result, optimal control of electrical loads allows to get technical and economic effects.

The results of field researches of the oscillatory process subgrade erected with sand dunes. The analysis of the oscillations records of particle of sand dunes at the main field, in the frame and be-hind of the subgrade. Given findings change of the value of oscillation amplitudes of dunes sand depending on the speed of trains. Analytical dependence of definition of attenuation of fluctuations in a body of subgrade from sand dunes and behind its limits is revealed.

The article covers stability and accuracy for restoration of uneven sampled signals, using basis functions. The accuracy and stability are explored for different transfer system orders, period between basis functions and offset of the basis functions system against restored samples.

The analysis of wave processes in the system including electric transmission lines, traction substations, AC traction network and electriclocomotives is necessary to accurately assess to energy performance of its work. This system contains concentrated and distributed parameters, consequently the analysis of such a system is difficult and the rolling stock which is also a part of this system represents a dynamic load. The proposed mathematical model of the alternating current traction power supply system allows us to consider electromagnetic processes at its various points taking into account wave processes.

Various converters are operated at electric railways traction substations whose rectifiers design includes plug-in power rectifiers and pill ones. Such a variety of rectifiers design causes the problem of the power supply reliable operation unavailability both of volumes and of quality information concerning the characteristics and diagnostic parameters of power semiconductors rectifiers. For a possible prediction of the diodes and thyristors proper operation, new instruments as well as simple technologies of the preventive diagnostics, correspondent to the state and industry standards and instructions should be developed. One of the most accurate methods to determine not only the serviceability of rectifiers but also to forecast their wear - life, is the diagnostic method of recurrent peak backward current. This method is the basis for the design of a peak backward current meter which is used on the Western-Siberian railway. Using this device the screening of about thirty thousand rectifiers was carried out which resulted in the sorting of out-of-work rectifiers, predicting long term rectifiers conditions. The statistical analysis of the research allowed to determine the number of measures to improve the reliability of traction substations converters.

The article describes the current state of railway non-traction electric power supply system in the electric grid complex. The main drawbacks of the existing electricity metering system in 0.4-10 kV distribution networks are shown. The main directions of non-tractive electric grid complex innovative development are considered, including directed to increase the efficiency of electric energy transformation, transmission and consumption processes due to the management of distribution networks operating modes. The basic principles of "Digital district power supply" constructing are given.

The technique and algorithm of definition of consumption rates of materials on the current maintenance of a way depending on freight density, the passed tonnage, the plan and a profile of sites of a way, axial loadings of a rolling stock is given. Standards are developed on the basis of the analysis of the existing normative documents, statistical data from forms of primary accounting of PU-74 of the consumption of materials, annual reports of linear sites and other sources. Depending on service conditions standards are determined by analytical dependences and the correcting coefficients.

The need to apply various methods for predicting the technical condition of reinforced concrete supports of the contact network is currently a necessary condition for ensuring the safety of train traffic. Such a need arose due to the presence in operation of supports with extended service life, in the absence of a reduction in loads, without the presence of various kinds of redundancy. The article describes a method for predicting the technical state of the supports of the contact network. Solving the problem of exploitation, which consists in the fact that it is rather difficult to reveal the system of failures of the considered object of exploitation, under the influence of many factors. The probability of finding the contact network supports in a certain state is expressed through the statistical properties of the contact network supports, based on the change in the carrying capacity

The article is about defining corrosion state of overhead structures underground part. Specially designed concrete models are used for experiments and calculations. These models are made with the fabric technology of overhead structures creation. «Steel - Concrete» interface region parameters are calculated with a help of transient process which situated when DC power supply is connected to the scheme. There is a formulas and a methodic for calculation needed parameters. In the end of the article theoretical curve is located. It exactly coincides with an experimental curve.