Browsing by Author "Romanyuk, Yanina N."

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    Evaluation of Longitudinal Loading of Tank Trains During Motion in Longitudinal Changes of Gradient
    (Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2013) Myamlin, Serhiy V.; Romanyuk, Yanina N.
    EN: Purpose. To research the tank train longitudinal loading during motion by track sections with changes of gradient. The trains of different length that consist of bogie tank wagons should be examined. Influence of cargo type on longitudinal loading of train during motion in concave section of track should be evaluated. Methodology. The level of the largest longitudinal forces was estimated by mathematical simulation. It was assumed that change of gradient is formed by two grades with baffle platforms, length 50 meters, so that the algebraic difference of limiting grades vary from 10 to 40 ‰, pitch 10 ‰. The initial speeds were 40, 60, 80, 100, 120 km/h. For evaluation of the longitudinal loading the regulating braking and motion «by coasting» was considered. For evaluation of buffing loads the entry to the concave gradient change of expanded train is considered, and in order to determine the quasi-static forces the compressed train is considered. Findings. As a result of calculations the dependencies of maximal longitudinal forces in the trains on the cargo type, the algebraic difference of the grades, the number of tank wagons, the initial speed, motion modes, and initial gaps condition in the train were obtained. Originality. The longitudinal loading of freight cars of different length formed by the similar bogie tank wagons with one locomotive was obtained. The locomotive is placed in the train head during motion in concave track sections with various algebraic difference of the grades «on coasting» and during the regulating braking mode. The obtained results can be used for parameters standardization of profile elevation of the track. Practical value. The obtained results show that during operation of tank trains on track sections of complex breakage the most dangerous is regulating braking of preliminary compressed trains during entering on concave parts of track. Level of the greatest buffing and quasi-static longitudinal forces is almost independent of cargo and slightly depends on the initial speed.
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    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.