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Wyszukujesz frazę "Kuznetsov, Valerii" wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Preventing the development of emergency modes of interlocked electric drives of a rolling mill under the impact loads
    Autorzy:
    Druzhinin, Valeriy
    Sivyakova, Galina
    Kalinin, Alexey
    Tytiuk, Valerii
    Nikolenko, Anatolii
    Kuznetsov, Vitaliy Vadimovich
    Kuzmenko, Mykhailo
    Powiązania:
    https://bibliotekanauki.pl/articles/2174475.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    power supply network
    voltage drops
    electric drive
    hot rolling mill
    mathematical modeling
    simulation modeling
    sieć zasilająca
    spadki napięcia
    napęd elektryczny
    modelowanie matematyczne
    modelowanie symulacyjne
    Opis:
    In recent years, due to the tightening of competition in the global market of steel producers, the requirements for the quality of hot-rolled steel have increased. The finishing group of the rolling mill is characterized by a complex structure of mechanical and electrical parts. The operation of electric drive systems of such units is characterized by the interrelation of electromagnetic processes, mechanical phenomena and technological factors. As experimental studies have shown, the quality of the supply voltage is inextricably linked with the impact nature of the loads in the rolling stands of the roughing and finishing groups of the hot rolling mill. A decrease in the supply voltage may be accompanied by the development of emergency modes of synchronous electric drives, leading to a decrease in the quality of the finished product.The paper developed a mathematical model of the power supply system of the rolling mill JSC "ArcelorMittal Temirtau". It is shown that this can lead to loss of synchronism of the synchronous motor. Such a voltage drop has a significant impact on the operation of DC electric drives of the finishing group. Various strategies are proposed to counter the development of emergency situations.
    Źródło:
    Diagnostyka; 2023, 24, 1; art. no. 2023105
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of the cargo fleet vessels power plants ecological indexes by development of the exhaust gas systems
    Autorzy:
    Kuznetsov, Valerii
    Dymo, Boris
    Kuznetsova, Svitlana
    Bondarenko, Mykola
    Voloshyn, Andrii
    Powiązania:
    https://bibliotekanauki.pl/articles/1573635.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine power plant
    emissions
    gas-air cooler
    nozzle
    intensification
    Opis:
    Modernisation of the power plants of cargo fleet vessels to satisfy the requirements set out by the International Maritime Organisation is an urgent scientific and technical problem. The article presents the results of developing a solution to this problem that focuses on the exhaust gas system. We propose the use of ejection nozzles as part of this system. It was found that when the ejection coefficient in these nozzles is n = 3, it is possible to exclude the use of SCR reactors, thus reducing the operating costs of the marine power plant. Using a mathematical modelling method, the efficiency of operation of six types of nozzle as part of the exhaust gas system was investigated, and a constructive layout was proposed for the gas ducts and inlet louvres for supplying ambient air. To increase the efficiency of the proposed system, we consider several options for intensifying heat transfer processes through the use of dimple systems in the nozzles and nozzles with swirling flow. We found that these technical solutions would make it possible to further increase the efficiency of the systems by up to 19% abs.
    Źródło:
    Polish Maritime Research; 2021, 1; 97-104
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The development of long-range heat transfer surfaces for marine diesel engine charge air coolers
    Autorzy:
    Kuznetsov, Valerii
    Gogorenko, Oleksiy
    Kuznetsova, Svetlana
    Powiązania:
    https://bibliotekanauki.pl/articles/1818882.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    marine diesel engines
    charge air cooler
    heat transfer surface
    efficiency
    finns
    dimples
    nonround cross section tube
    Opis:
    Charge air cooling is essential for the efficient operation of marine diesel engines. This work presents the results of research on the characteristics of long-range heat transfer surfaces for marine diesel engines. Elliptical and flat-oval tubes were considered. This study was carried out using mathematical models that consisted of the equations for energy conservation, motion, continuity, and state. The RSM turbulence model was used to close the system of equations. To solve the resulting system of equations, the RANS approach was used, which was implemented in the software package Code Saturne with a free license and the SimScale cloud service. The mathematical model was verified by comparing the model results with the experimental results obtained using a prototype heat-exchange surface of a charge air cooler at a test bench. The discrepancy between the theoretical and experimental heat transfer coefficient α was ≤ 8.3%. An estimate of the compactness of smooth elliptical and flat-oval tube banks compared with round ones was carried out. A 19.6% increase in compactness was obtained for elliptical tubes and 17.5% for flat-oval tubes. Based on the profiled finning surfaces, it is possible to improve their thermohydraulic characteristics by up to 40% when using them together with elliptical tubes compared with round ones and up to 26% when using them with flat-oval tubes.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2021, 65 (137); 51-57
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of rational design values for gas-air coolers components of exhaust gases of marine power plants
    Autorzy:
    Kuznetsova, Svitlana
    Kuznetsov, Valerii
    Voloshyn, Andrii
    Powiązania:
    https://bibliotekanauki.pl/articles/34615989.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    vessel
    marine power plant
    environmental parameters
    emissions
    gas-air cooler
    nozzle
    Opis:
    Modernisation of marine power plants in the transport vessel fleet to satisfy the requirements of the International Maritime Organization is an urgent scientific and technical problem. Currently, the use of catalytic selective filters, dry and wet scrubber systems and exhaust gas recirculation for marine diesel engines is widely used for this purpose. An analysis of the use of ejection gas-air coolers is presented as an additional method of emission reduction. However, the use of such device does not neutralise the harmful emissions of power plant engines, but only increases the volume concentration of their exhaust gases. But this will help to increase the efficiency of dispersion of harmful emissions, by reducing the concentration of harmful emissions to values not exceeding the maximum permissible concentrations. Its efficiency depends on the load mode of the diesel engine. It is found that the initial concentration of harmful substances in combustion products due to their dilution with fresh air at 100% engine load is reduced by about 50%. The values of the reduction of the concentration and temperature of exhaust gases with the reduction of the engine load to 75% and 50% depending on the louvre angle are obtained. It is proved that ejection gas-air coolers can be an effective additional means for compliance with modern environmental parameters, especially when vessels are in special areas of the world’s oceans.
    Źródło:
    Polish Maritime Research; 2023, 3; 81-88
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal Method for Polarization Selection of Stationary Objects Against the Background of the Earth’s Surface
    Autorzy:
    Volosyuk, Valerii
    Zhyla, Simeon
    Pavlikov, Vladimir
    Ruzhentsev, Nikolay
    Tserne, Eduard
    Popov, Anatoliy
    Shmatko, Oleksandr
    Dergachov, Kostiantyn
    Havrylenko, Olena
    Ostroumov, Ivan
    Kuzmenko, Nataliia
    Sushchenko, Olga
    Averyanova, Yuliya
    Zaliskyi, Maksym
    Solomentsev, Oleksandr
    Kuznetsov, Borys
    Nikitina, Tatyana
    Powiązania:
    https://bibliotekanauki.pl/articles/2055248.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polarimetric radar
    polarization selection
    power lines detection
    multichannel processing
    maximum likelihood method
    Opis:
    Within the maximum likelihood method an optimal algorithm for polarization target selection against the background of interfering signal reflected from the earth’s surface is synthesized. The algorithm contains joint operations of spectral interference rejection and their polarization compensation by means of certain combinations of interchannel subtraction of signals of different polarizations. The physical features of the elements of the polarization scattering matrix are investigated for the technical implementation of the synthesized algorithm.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 1; 83--89
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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