Наукові публікації та патенти в рамках виконання держбюджетних науково-дослідних робіт 2019 р.

Permanent URI for this community

https://dspace.snu.edu.ua/handle/123456789/84

Browse

Browsing Наукові публікації та патенти в рамках виконання держбюджетних науково-дослідних робіт 2019 р. by Author "Bureika, G."

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Experimental study of the influence of friction surfaces cooling parameters on the efficiency of the braking system of a railway vehicle operation.
    (2018) Gorbunov, M. I.; Prosvirova, O.; Kovtanets, M.; Nozhenko, V.; Bureika, G.; Skrickij, V.
    The purpose of the study is to evaluate the effect of cooling frictional surfaces on the efficiency of the braking system by experimentally determining the coefficient of friction and the temperature of the interacting surfaces under different methods and regimes of cooling. Experimental research established that the mathematical model of the disc brake thermophysical characteristics, which takes into account the adaptive cooling system, ensures a satisfactory match of the results of calculations to experimental data; the discrepancy does not exceed 10-12%. Analysis of the experimental data obtained allows concluding that adaptive cooling of the brake friction surfaces has a positive effect on the braking efficiency. Thus, the coefficient of friction when using this system is 15-30% higher, depending on the performance and temperature of the cooling air, than without its use. The average integral temperature of surfaces in frictional interaction is lower by average of 20-30% compared to the case when adaptive cooling is not used.
  • Thumbnail Image
    Item
    Reducing the wheel-rail system wear intensity with thermomechanical impact.
    (2019) Gorbunov, M. I.; Kovtanets, M.; Bureika, G.; Kovtanets, T.
  • Thumbnail Image
    Item
    Theory and practice of the innovative spring suspension design for locomotive to improve its traction and dynamic characteristics.
    (2018) Gorbunov, M. I.; Kravchenko, K.; Kara, S.; Gerlici, J.; Bureika, G.; Steišūnas, S.
    This paper deals with the methods and techniques of the locomotive dynamic characteristics improvement, decrease in force impact on the track, minimizing tire and rail wear by secondary suspension improvement. Based on the calculations carried out using the created mathematical models and experimental research, there are proposed series of construction solutions of the supporting and returning devices with rational characteristics, which allow improving traction characteristics of the locomotive and reducing its dynamic impact on the track in vertical as well as in horizontal planes, on the straight track as well as on the curved track. Moreover, the proposed solution can provide the locomotive body with the centering function relative to the bogie. The proposed body to bogie connection was tested using a special test stand and in operating conditions. According to the test results, the proposed construction of body to bogie connection can ensure the required rigidity and damping characteristics due to the design optimization.