HIGH-SPEED ROLLING STOCK OF UKRAINE

A brief history of the development of high-speed passenger traffic in the countries of the world is shown, it is shown that the length of high-speed highways (SMM) in the world is 44 thousand km. Despite the fact that Ukraine is not included in the list of 28 countries with the SMM, a two-system electric train ECR1 "Tarpan" was created on the basis of the PUBLIC JOINT STOCK COMPANY "KRYUKOVSKY RAILWAY CAR BUILDING WORKS" (PJSC "KVBZ") for the speed of movement of more than 200 km / h. A description of the electric train and the peculiarities of the brake system are given. It is shown that the brake system corresponds to world counterparts for high-speed trains about what evidence test results, which, due to the lack of ATS, were carried out for a speed of 160 km / h. The results of the settlement research, using the mathematical model and the results of the driving brake tests, showed that the braking pathway of the electric train at a speed of 200 km / h is 1539 m, and at a speed of 300 km / h - 3172 m. The obtained brake path values comply with the technical requirements of the European Union TSI . Studies confirm that Ukraine has high-speed rolling stock for speeds up to 300 km / h. Key words: high-speed rolling stock, electric train, brake system, brake path, speed

METHODS FOR THE SCHEMATIZATION OF THE OPERATIONAL LOADING OF THE FREIGHT CAR

The world trend, recently, is the creation of a high-speed cargo rolling stock for speeds with 160 km / h. In these condition, the durability of the structure of the cargo car are relevant. In the process of movement in the design of the car, voltages occur, variables in time. Under the action of alternating voltages in the design elements, the process of gradual accumulation of damage, leading to the formation of microscopic crack, and then to its development and subsequent sudden destruction - metal fatigue. One of the main properties of the wagon is the ability to withstand operational loads acting on it while maintaining this ability without destruction at all stages of the life cycle. The assessment of the bearing capacity is determined by the results of the undercarriage tests, the purpose of which is the definition and assessment of the reserve coefficient of fatigue resistance of the equivalent reduced amplitude of dy-namic stresses. As a rule, dynamic stresses are random due to the perturbing effect on the side of the rail path on the wheeled pairs, which are also random. Therefore, an important section of the study is the choice of methods for obtaining, processing and analyzing experimental data. Improving the reliability of test results is achieved by applying more advanced recording methods and processing results. To estimate the level of loading of the cargo car, methods are used based on the replacement of a real random process by some schematized process, which in terms of the accumulation of fatigue damage should be equivalent to a real process. Of the variety of schematics methods, two methods are distinguished - the method of complete cycles and the rain method, which most fully reflect the real process. The advantage of the "rain" method is the ability to process the process in real time. However, the algorithm of the "rain" method is quite complicated and does not allow processing large amounts of information. In this regard, the method of maximum discharges was proposed, which is a type of full cycles method and allows you to process an unlimited amount of information online. The schematic process is divided into classes - voltage amplitudes values. Depending on the distribution of voltage amplitudes in classes, the frequency (probability) of amplitude in the class is established. The reduced amplitude of the dynamic voltage is defined as the amount of products of the likelihood of entering each class on the average magnitude of the voltage amplitude in the class. Key words: cargo car, process, dynamic, voltage, amplitude.

RESEARCH OF THE CONSEQUENCES OF THE COVID-19 PANDEMIC EFFECT ON THE RAILWAY TRANSPORT ENTERPRISES

The article deals with the study of the negative effects of the COVID-19 pandemic on the world economy. The impact on industrial production and particularly on machine-building industry of Ukraine is considered. The figures of freight and passenger cars manufactured by plants of Ukraine are given. The issue of importing old-aged freight wagons to the territory of Ukraine, which caused an overbalance of life-expired wagons, was considered. This has become a huge problem at such challenging times for domestic freight wagons manufacturers. The activities aimed at bringing the current technical condition of wagons with expired service life to normative condition, reducing the risks of man-made disasters, increasing the competitiveness of rail transportation and engaging the operators of freight cars in the purchase of new freight wagons manufactured by Ukrainian producers are proposed. The paper presents the results of the impact of quarantine restrictions on railway transport. The data on the drop in railway transportation caused by the pandemic in Ukraine and in the countries of the European Union, and the results of the comparative analysis are given. The volumes of the downfall in the production of freight cars and their reasons are analyzed, suggestions on the overcoming the crisis in machine building industry are defined, which will allow to resume the work of rail transport and related industries. This provides a real vision of the possible course of economic processes that will have an immediate effect on the standards of the social life. Key words: economic crisis, COVID-19, economic recession, industry, machine-building industry, railway transport, railcar-building industry, freight transportation, passenger transportation, EU railways.

MANUFACTURE OF ROUGH AXLES PRE-MACHINED BY THE ROUNDING PROCESS

The article deals with the definition of the term “rough axle” (profile billet). Among other things, data on the manufacturing process of axle billets, as well as manufacturing methods for rough axles in Ukraine are presented. Rough axles in our country are manufactured using three different methods of hot-forming process: free forging, screw rolling and radial-rotation profile forming. New method of manufacturing a pre-machined rough axle is described. References to the paper, i.e., determination of comparative characteristics of internal defects of different types of rough axles produced by several domestic manufacturers using various methods and technological processes are made. These characteristics were determined by the Testing Center for railcar-building products of DP "UkrNDIV" during different types of testing rough axles manufactured in the period from 2002 to 2017. The testing is described and the parameters of the test objects which were determined, namely, geometrical dimensions, surface integrity, marking, testing of sound permeability and internal defects of the axles, chemical composition and mechanical characteristics of the axle structure, macrostructure cleanliness, nonmetallic inclusions in the steel, micrographic cleanliness are indicated. Also, the testing results of pre-machined rough axles, manufactured by the method of turning the round billet, carried out by the Testing Center of DP "UkrNDIV" in the period from 2018 to 2021 are presented. Findings based on the tests results are set forth, that is, the tested parameters of test objects meet the requirements of regulatory documentation, steel-melting and manufacturing technological processes for rough axles manufactured by PJSC "INTERPIPE NTRP" comply with DSTU HOST 31334:2009, DSTU HOST 4728:2014 and TU U 30.2-23365425-701:2018. The list of literature sources including state standards and technical specification used while writing the paper and the article itself are given. Key words: rough axle, continuously steel-casting method, round billet.

TECHNICAL DIAGNOSIS OF TRACTION ROLLING STOCK. FEATURES OF APPLICATION OF THE METHOD OF EVALUATION OF THE RESIDUAL RESOURCE OF SUPPORTING METAL STRUCTURES

Recently there is the intrest increasing in admission of private locomotives to the operating on the particular headings of public railways. At the initiative of Ministry of Infrastructure the Resolution of the Cabinet of Ministers of Ukraine dated 04.12.2019 № 1043 “About implementation of experimental project on the admission of private locomotives to the operating on the particular headings of public railways” is confirmed. The experimental project is designed for two years, it means till 04.12.2021. According to the requirements of the “Temporary Regulations on the procedure of the admission of private locomotives to the operating on the particular headings of public railways” approved by the Order of the Ministry of Infrastructure of Ukraine dated 04.03.2020 № 191, defined the requirements for applicants (enterprises), rolling stock, their maintanence and repair, personnel. In particular, it is established that private locomotives are allowed to operate on public railways with the availability of a conformity certificate. Private locomotives, that are applied for participation in experimental project, as a rule, are not new, and have certain service life, respectively, certain performance characteristics, remaining operating life of load-bearing metal structures, so the certification procedure of locomotives has some particularities and should cover, exept common measures of certification, measures of technical diagnoses, i.e. with the assessment of final resources of load-bearing metal struc-tures. Key words: experimental project, allowance for private locomotives, a conformity certificate, technical diagnoses.

HIGH SPEED FREIGHT TRAIN FOR TRANSPORTATION OF CONTAINERS AT SPEED OF 200 KM/H

The article is devoted to building of freight trains for transportation of containers with railway transport at speed of 200 km/h. The article considers building experience of the high speed freight trains for transportation of containers at speed of 350 km/h. Main technical characteristics of the rolling stock, involved in freight high speed railway transportation in foreign countries are analyzed. The purpose of the article is to discover design features of the rolling stock for freight transportations at speed of 200 km/h and in modeling of the braking processes during electro pneumatic and pneumatic braking of the rolling stock from speed of 200 km/h to 160 km/h. The concept of the rolling stock for high speed freight transportation of containers is proposed. A specialized platform with bogies, disc brake and air-spring suspension Installed on it is used as a rolling stock. A brief description of the brake system is given; its main features are shown. A pneumatic scheme of the container block of the braking equipment and the general view of container block is given. Classified freight train, which consists of 30 platform cars and has two locomotives on each side is proposed for high speed transportation. Brake distance during electro pneumatic and pneumatic braking at freight train speed of 160 km/h is calculated. The results of calculated studies of the trains braking efficiency are given, which showed that at the speed of the freight train of 200 km/h, the brake distances at electro pneumatic and pneumatic braking are represented by 1472 m and 1571 m respectively, which corresponds to the technical requirements of the European Union TSI. Key words: high-speed freight trains, container, speed, brake distance, disc brakes.

METHODS, PROCEDURES, PRACTICES AND RULES OF CARRYING OUT CERTIFICATION IN THE CERTIFICATION SYSTEM OF RAILCAR BUILDING PRODUCTS

After adoption of the Law of Ukraine On Technical Regulations and Conformity Assessment, and, in connection with the transition from mandatory certification in the state system to the sphere of technical regulation, the bodies that carry out activities on product certification were facing the need to create their own certification systems. On the one hand, this is a necessity step, and on the other, it is the acquisition of some freedoms in the choice of the methodology for carrying out certification work; the possibility of improving activities; promoting the development of promising areas within the scope of accreditation; enhanced functionality. In this case, the above-mentioned positive aspects of creating the own certification system, which, by the way, may differ from other systems, provide conditions for the certification body to be very responsible for the decisions made on the conformity of certified products. The purpose of this article is to provide information on methodological approaches to the creation, development and improvement of the Certification System for railcar building products. In general, the creation of a certification system for railcar-building products took place during the period of formation of the UkrSEPRO certification system. But during this period in Ukraine national standards of the 3400 series were put into effect, in which the basic principles, rules, requirements and structure of the UkrSEPRO certification system were specified. The modern approach to product conformity assessment, introduced in the field of technical regulation, did not destroy certification at all, as incompetent representatives of the mass media imagine it, but endowed it with a different status and place in the conformity assessment system. Furthermore, according to the Law of Ukraine “On Technical Regulations and Conformity Assessment”, the term "certification" is interpreted as "confirmation of conformity by a third party in relation to products, processes, services, systems or personnel." At the same time, in accordance with this law, the term “conformity assessment system” is defined as “rules, procedures and management for carrying out conformity assessment”. Key words: certification system, technical regulations, conformity assessment, certification body, principles, rules, certification procedure.

THE ALGORITHM FOR DETERMINING EQUIVALENT STRESSES IN THE CARGO CAR FRAME FROM THE LONGITUDINAL FORCES ACCORDING TO THE RESULTS OF TESTS FOR COLLISION

Recently, the global car building has been a tendency to actively work on the creation of innovative cargo cars that meet modern requirements. The main directions of creating innovative cars consist in increasing axial loads and speed of movement. Under these conditions, issues of strength and reliability of wagons design are becoming relevant, the ability to withstand operational loads for the entire service life. The most damaging are shock loads arising from the dissolution of cars from the sorting slodder, the production of maneuver work, when braking, the sedimentation of the train, etc. Dynamic drum tests of cargo wagons under which the longitudinal shock forces are applied to the car frame via the motor armor, to determine the dynamic stresses and their distribution in the elements of the frame and body of the wagon, the maximum permissible value of the longitudinal force at which the rim or body of the wagon may occur. Impact tests can be carried out with a single car, which hits a group of inhibited loaded wagons, standing on a direct horizontal section of the railway track, or in which the loaded car battlefield is hung at different collisions. At the same time, the establishment of the strength of the frame of the wagon with longitudinal loads at maximum stresses, with modern requirements, is insufficient. Therefore, the main task of percussion tests is to determine the carrier capacity of the carriage for the entire service life. In this regard, the purpose of percussion tests is to determine the equivalent reduced amplitude of the strain from the action of the longitudinal forces arising in operation for the entire service life of the car, which makes it possible to estimate the safety reserve coefficient. An important stage of research is the automation of testing, which allows minimizing the number of errors caused by the human factor, increase the accuracy of calculations and reduce the time for testing. Key words: longitudinal forces, scheme, algorithm, strain, amplitude, impact force.

TO THE HISTORY OF RENEWING THE PARK OF FREIGHT CARS OF THE STATE RAILWAYS OF UKRAINE (1918 – 1919)

The article attempts to investigate the historical circumstances of technological renewal of the fleet of freight cars of the state railways of Ukraine in 1918-1919. It is found that in conditions of political instability and deep economic crisis its sustainable operation. The need for coherence in the operation of railway transport was due to the aggravation of the final act of the First World War, which also affected the technical task of rolling stock in the context of its equipment with means of transporting troops. It is determined that against the background of limited available resources, domestic machine-building enterprises presented conceptual samples of biaxial covered freight cars of the NTV type, developed on the basis of all the requirements of the time, taking into account possible technical replacements of individual components. The reasons for the slowdown in the process of renewal of the rolling stock of state railways, as well as the general restoration of the transport industry of Hetman Ukraine in 1918-1919 are clarified. the latest examples of legendary monuments of domestic car building should be a priority for the revitalization of the technological heritage of railway transport of Ukraine. Further study of the topic requires clarification of a wide range of issues concerning the impact of these events on the restoration of the Soviet railway industry in the first half of the 1920s. The practical significance of the proposed study can be introduced into the development of the concept of restoration of historical rolling stock for the branch museum collection of Ukrainian railways. Key words: freight car, rolling stock, railways of Ukraine, industry, transport.

PRIVATE TRACTION ROLLING STOCK ON THE MAIN-LINE TRACKS. ASPECTS CERTIFICATION OF PRIVATE LOCOMOTIVES

The article deals with the procedures for certification of private locomotives in order to grant authorization for their operation on certain public railway lines. The special feature of the certification is that, as a rule, locomotives belonging to departments, enterprises and organizations that are not within the management sphere of JSC "Ukrzaliznytsia" and were not previously used on public railway lines of Ukraine, but are now presented for participation in the project, can be of several types, different years of construction, have different diesel operating hours (SMU hours), different degrees of wear of the mechanical part of load-bearing structures, wheelsets, trolleys, couplings, braking equipment, different technical condition of measuring instruments, safety devices and air tanks, devices security, etc. Therefore, the article presents the provisions of certification schemes (models) that can be used by the certification body for the certification of single locomotives and batches of private locomotives, and their aspects. The paper also presents the basic normative documents according to which certification procedures are carried out. The key aspects of existing certification testing of locomotives are specified. The scope of work on technical diagnostics of locomotives for certification is described. The procedure and duration of the direct certification process are given taking into account the analysis of documentation, technical inspection, provision of expert evaluation, selection and identification of a sample (samples) of a representative item from the batch submitted for sampling, certification testing, processing and registration of test results, comprehensive conclusion on compliance of the locomotive with the requirements of regulatory and technical documents, decision-making on the possibility (or impossibility) of issuing a certificate.