Browsing by Author "Ursuliak, Liudmyla V."
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Item About the Evaluation of the Longitudinal Forces Level Effecting the Track Displacement at Transient Modes of Train Movement(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Masleieva, Liudmyla H.; Ursuliak, Liudmyla V.; Arsonov V. V.EN: Purpose. Study the transient modes effect of movement on the track displacement for the freight train safety control is supposed in this paper. For this it is necessary to investigate the longitudinal dynamics of a train on the track displacement. Simultaneously to assess the longitudinal forces level of a track and rolling stock interaction. Methodology. The level of the longitudinal forces, effecting the track displacement, was evaluated using mathematical modeling of longitudinal vibrations of the trains at transient modes of motion caused by braking. It was considered that each train vehicle consists of a body (solid) and the wheel sets, connected with the body by friction bearings (inelastic link). It was believed that during the movement of each train vehicle the vertical plane of its symmetry coincident with the vertical plane of symmetry of the assembled rails and sleepers. At simulation it was also supposed that in the process of translational motion of the vehicle body wheels make pure rolling along the rail without slipping on it. Findings. In the results of calculations the values of the longitudinal forces at different types of braking were obtained (it is regenerative braking and pneumatic one) under quasi-static and shock transients. For this various initial state of clearances in the inter-car connections up to beginning of transient was considered. The level of dynamic additives to longitudinal forces of interaction between wheel and rail that are substantially depending on vehicle accelerations was assessed. Originality. The transient regimes effect of trains movement caused by braking on the level of the longitudinal forces of track and rolling stock interaction was investigated. The longitudinal load of freight trains with regenerative and pneumatic braking was researched. The effect of the initial state of the train and different modes of braking on a dynamic additive to the longitudinal forces of the interaction between the track and rolling stock, which may effect the displacement of assembled rails and sleepers, was estimated. Practical value. The obtained results can be used to select rational modes of braking of freight trains, especially on lengthy down grade, from the positions prevent possible track displacement.Item Nestacionarieji ir Kvazistatiniai Gelezinkelio Traukiniгu Judejimo Rezimai(Vilniaus Gedimino Technicos Universitetas leidykla Technika, Vilnius, 2015) Blochinas, Eugenijus; Dailydka, Stasys; Lingaitis, Leonas P.; Ursuliak, Liudmyla V.LT: Monografija "Nestacionarieji ir kvazistatiniai gelezinkelio traukiniu judejimo rezimai" skirta skaitytojui, besidominciam traukinyje, kaip netiesineje daugiamaseje mechanineje sistemoje, vykstanciais procesais. Sie vyksta traukiniui pajudant is vietos, stabdant, keiciant traukos jega, judant kalnuoto profilio keliu. Knygoje aprasomos uzduotys sprendziamos taikant traukiniu judejimo pereinamuju arba nestacionariuju procesu teorija. Tam sukurta speciali programine iranga, pagrista monografijos autoriu sukurta traukiniu judejimo pereinamuju rezimu teorija. Knyga sudaryta taip, kad skaitytojas pradzioje susipazintu su traukiniu sastatu schemomis ir matematiniais modeliais traukinio judejimui modeliuoti. Taip pat aprasoma informacines sistemas "Traukinio dinamikos analizatorius" elementu tarpusavio sasaja. Autoriai monografija rekomenduoja gelezinkeliu traukos klausimus nuodugniau nagrinejantiems doktorantams ir pazengusiems magistrantams.Item On the Problem of Dynamic Response of the Long Trains Including Joint Ones with the Liquid Cargo(Vilnius Gedeminas Technikal Universiti, 2011) Ursuliak, Liudmyla V.; Romanyuk, Yanina N.EN: The results of long trains with liquid cargo dynamic response at braking obtained by the mathematical simulations are given in the article. Different approaches of the lead and helping locomotives control are considered for the various schemes of the train make-up. Numerical experiments were carried out for the various types of braking on the horizon-tal track segment and for different regimes of air diffusers work – middle or loaded. The initial motion speeds were equal to 20 and 80 km/h. For the higher speeds the braking distances were estimated. Recommendations on the longitu-dinal dynamic response reduction in the long trains with liquid cargo are given on the basis of the carried out numerical calculations.