Browsing by Author "Pulariia, Andriy L."

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Analysis of Rolling Stock Coupling Designs and Technologies for the Implementation of International Railway Operations Between Ukraine and the European Union
(Lviv Polytechnic National University, 2025) Batig, Andriy; Pulariia, Andriy L.; Tereshchak, Yuriy V.
ENG: The purpose of this study is to analyze the existing and prospective coupling device designs and technologies for their application in organizing international railway operations between Ukraine and the European Union. The research identifies the main technical barriers associated with domestic rolling stock and explores optimal pathways for integrating Ukrainian rolling stock into the European transport system. The study also considers the possibility of adapting EU-member-state wagons for operation within the railway network of JSC “Ukrzaliznytsia”. An analysis of regulatory and technical documentation was conducted, including DSTU, UIC, and EN standards, as well as regulatory documents of the Council for Rail Transport, which define the requirements for coupling devices and rolling stock. A comparative review was conducted, followed by a detailed investigation and analysis of the design, operating conditions, and structural features of various types of couplers: SA-3 automatic couplers, screw couplings, universal systems, and digital automatic coupling systems (DAC). The research employs a systematic approach, providing a comprehensive assessment of operational performance, safety levels, and the economic feasibility of deploying each of the examined coupling technologies. The object of the study comprises the designs and performance characteristics of railway rolling stock coupling devices and the technologies governing their use in international railway operations on both 1520 mm and 1435 mm gauge networks. The results obtained based on a systematic analysis of regulatory documents for rolling stock operating on 1520 mm and 1435 mm gauge networks, as well as the design features and engineering solutions of coupling systems. They also include the identification of key directions for the development and implementation of modern coupling technologies for international railway operations involving both freight wagons and passenger rolling stock. The analysis considers the specific operational conditions at border crossing points and stations, as well as the local operational and environmental constraints that affect rolling stock operations. A comprehensive assessment of the compatibility between SA-3 automatic couplers and screw coupling systems under international transport conditions between Ukraine and EU member states has been performed. Contemporary technologies enabling the adaptation of rolling stock for joint operation on 1520 mm and 1435 mm gauge networks have been systematized, including adapter devices, variable-gauge systems, and combined coupling configurations. A model for the phased integration of the Ukrainian automatic coupling system into European standards has been developed, utilizing transitional technical solutions. The results of the research can be applied to the development of technical regulations for rolling stock modernization, wagon and train handling technologies, and engineering solutions for designing wagons and locomotives intended for interoperable operation on both 1520 mm and 1435 mm gauge systems. The proposed recommendations will help reduce dwell times at border crossing points by eliminating the need for coupling device replacement. Additionally, they will help reduce operating costs and increase the efficiency of logistics processes for wagons equipped with screw coupling systems by automating train formation procedures, while enhancing operational safety. The findings of this study may be useful for infrastructure projects aimed at integrating the Ukrainian railway network into the European transport system.
Determining the Dynamic Indicators of the Pneumatic Spring for High-Speed Rolling Stock in the Zone of a Rail Joint along a Railroad Track
(TECHNOLOGY CENTER PC, Kharkiv, 2024) Kovalchuk, Vitalii V.; Kuzyshyn, Andriy Ya.; Royko, Yuriy; Hermaniuk, Yuliia M.; Tereshchak, Yuriy V.; Pulariia, Andriy L.
ENG: The object of this study is the pneumatic spring of the high-speed railroad rolling stock that moves over the rail joint of a railroad track with a vertical ledge. The task solved was establishing the dynamic behavior of the rubber cord shell of the pneumatic spring of the high-speed railroad rolling stock, taking into account the design features of the railroad track, namely the rail joint. The methodology for experimental testing of the pneumatic spring of the high-speed railroad rolling stock using the proposed dynamic test installation is given. Experimental tests of the pneumatic spring were carried out within the rail joint of the railroad track, which has a vertical ledge of 7.0 mm. It was established that the maximum value of the accelerations of the rubber cord shell of the pneumatic spring occurs in the vertical plane. The maximum vertical accelerations of the rubber cord shell of the pneumatic spring were 2.4 m/s2, horizontal transverse accelerations – 0.85 m/s2, and horizontal longitudinal accelerations – 0.9 m/s2. It was determined that the deformations of the pneumatic spring in the vertical plane are higher than the deformations in the horizontal plane. The value of the maximum vertical deformations of the pneumatic spring was 4.1 mm, while the maximum value of horizontal deformations was 1.2 mm. The natural frequencies and logarithmic decrements of oscillations damping were determined based on the obtained records of the free oscillations of the rubber cord shell of the pneumatic spring. It was established that the value of the first natural frequency of oscillations of the pneumatic spring is 3.21 Hz. The logarithmic decrement of oscillation damping of the rubber cord shell of the pneumatic spring was determined based on the constructed graph of oscillation damping with an approximating exponent. It is 0.2147. The obtained values of the dynamic indicators of the new pneumatic spring could be used in the future to control changes in the physical and mechanical properties of the rubber cord shell of the pneumatic spring under the operational conditions of the railroad track. In practice, engineers and scientists will be able to take into account the obtained dynamic parameters of the spring when designing and improving the pneumatic spring for high-speed train movement.
Development of Recommendations for Extending the Useful life of Passenger Cars
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Myamlin, Serhiy V.; Reidemeister, Alexey G.; Pulariia, Andriy L.; Kalashnyk, Volodymyr O.
EN: Purpose. The vast majority of passenger car fleet of «Ukrzaliznytsia» have cars with outlasted service life. In this regard there is a need to find methods to justify the extending useful life of passenger cars and to assess the car body frame residual life conformity to the operating load for the next life time. Methodology. The selection of cars enforced technical diagnostics of cars to detect the level of corrosion and mechanical damage. The following steps provided the car body frame strength analysis on the basis of experimental static and impact strength tests, the longitudinal force effect endurance tests as well as assessment and forecasting of conformity of car body operating life for the next period. Findings The car survey before testing showed that the technical condition of sleeper cars (SSC) is better than that of open-type cars (SOC). So, in SSC cars the thinning of the main load-bearing elements due to corrosion does not exceed 10%, there are no cracks, deformations, rack breakages, etc. At the same time in SOC cars the thinning due to local corrosion reached 35%. There are deformations and corrosion damage of side sill Zshape of both cars, single corner post breakages, damage to the joints of longitudinal tie rod and span bolsters. The conducted static and impact strength tests with following strength assessment of the car structural members showed that the strength of the latter is provided according to the normative documents, and these cars pose no threat to traffic safety. The impact endurance tests showed that all the cars passed the endurance tests without damage, which would prevent from testing and could not be removed during the next depot repair or overhaul, and had life length that allows them to extend the useful life for the next period. Originality. The results of experimental studies show that passenger cars after 28 … 30 and 33… 35 years of operation meet the requirements of strength and safety in accordance with regulatory documents and allow, provided the impact endurance, reasonable extending of the car service life. Practical value. The part of the car fleet, which was to be written off based on the service life, may extend lifespan without additional measures.