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    Wyświetlanie 1-4 z 4
    Tytuł:
    The accuracy of defining the energy efficiency of drive systems exemplified by comparison with hydrostatic drives with proportional motor speed control
    Autorzy:
    Skorek, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/135559.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    energy efficiency
    useful power
    power of losses
    accuracy
    field of work
    drive system
    hydrostatic transmission
    Opis:
    The aim of the article is to look at the possibility of accurately determining the energy efficiency of drive systems. The results of experimentally determined efficiencies and the efficiencies determined from simulations of two hydrostatic systems with throttling control and fed by a constant capacity pump were compared. The research apparatus was very precisely designed, made and automated. The measuring instruments that were used are characterized by their high measuring accuracy. The issues related to the determination of the energy losses and the energy efficiency of the hydraulic motor or drive system, which should be determined as dependent on the physical quantities independent of these losses, were also discussed. A Paszota diagram of the power increase in the direction opposite to the direction of the power flow, replacing the Sankey diagram of the power decrease in the direction of the power flow in the hydraulic motor or in the drive system, was analyzed. The results showed that a Paszota diagram opens up a new perspective on research on the power of energy losses and energy efficiency of hydraulic motors and drive systems.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 58 (130); 32-41
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność określania sprawności energetycznej układów napędowych na przykładzie porównania napędów hydrostatycznych ze sterowaniem proporcjonalnym prędkości silnika
    Autorzy:
    Skorek, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/303264.pdf
    Data publikacji:
    2019
    Wydawca:
    Wydawnictwo Druk-Art
    Tematy:
    efektywność energetyczna
    dokładność
    układ napędowy
    przekładnia hydrostatyczna
    energy efficiency
    accuracy
    field of work
    drive system
    hydrostatic transmission
    Opis:
    Celem artykułu jest spojrzenie na możliwość dokładnego określania sprawności energetycznej układów napędowych. Porównano wyniki eksperymentalnie określonych sprawności i symulacyjnie określonych sprawności dwóch układów hydrostatycznych ze sterowaniem dławieniowym, które zasilane są pompą o stałej wydajności. Stanowisko badawcze zostało bardzo starannie zaprojektowane, wykonane i zautomatyzowane. Zastosowane przyrządy pomiarowe cechowała wysoka dokładność pomiarów. Poruszono także tematykę związaną z określaniem strat energetycznych i sprawności energetycznej silnika lub układu napędowego, które powinny być określane jako zależne od wielkości fizycznych niezależnych od tych strat. Przeanalizowano wykres Paszoty wzrostu mocy w kierunku przeciwnym do kierunku przepływu mocy, zastępujący wykres Sankeya spadku mocy zgodnego z kierunkiem przepływu mocy w silniku lub w układzie napędowym. Wykres Paszoty otwiera nową perspektywę badań mocy strat energetycznych i sprawności energetycznej silników i układów napędowych.
    The aim of the article is to look at the possibility of accurately determining the energy efficiency of drive systems. The results of experimentally determined efficiencies and simulationally determined efficiencies of two hydrostatic systems with throttling control, which are fed with a constant capacity pump, were compared. The research stand was very precise designed, made and automated. The applied measuring instruments were characterized by high accuracy of measurements. The issues related to the determination of energy losses and energy efficiency of the hydraulic motor or drive system, which should be determined as dependent on the physical quantities independent of these losses, were also discussed. A Paszota diagram of the power increase in the direction opposite to the direction of the power flow, replacing the Sankey diagram of the power decrease in the direction of the power flow in the hydraulic motor or in the drive system was analyzed. Paszota diagram opens a new perspective on the research of the power of energy losses and energy efficiency of hydraulic motors and drive systems.
    Źródło:
    Napędy i Sterowanie; 2019, 21, 4; 86-93
    1507-7764
    Pojawia się w:
    Napędy i Sterowanie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of coefficients of energy losses occurring in a constant capacity pump working in a typical hydrostatic drive
    Autorzy:
    Skorek, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/245612.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    coefficients of losses
    energy losses
    hydrostatic system
    axial piston pump
    Opis:
    In order to assess possibilities of energy saving during hydrostatic drive system operation, should be learned, and described losses occurring in system. Awareness of proportion of energy, volume, pressure, and mechanical losses in elements is essential for improving functionality and quality of hydrostatic drive systems characterized by unquestionable advantages. In systems with too low efficiency there is increase of load, mainly in case of pump load, which can lead to higher risk of failure, necessity of repair or replacement, as well as to shorten service life of system. Coefficients ki, given in subject literature by Paszota, describe relative value of individual losses in element. They make it possible to assess proportions of losses and assess value of energy efficiency (volumetric, pressure, mechanical) resulting from losses occurring at nominal pressure pn of system in which element is used. As a result, thanks to knowledge of coefficients ki of individual losses, it is possible to determine losses and energy efficiency of components operating in hydraulic system as well as efficiency of system with defined structure of motor speed control as function of speed and load coefficient of motor. Knowledge of coefficients of energy losses occurring in system elements (pump, hydraulic motor, conduits, and motor) allows building models of losses and energy efficiency of element working in system and energy efficiency of system as whole composed of elements. Mathematical models of losses and energy efficiency in system must take into account conditions resulting from applied structure of system, from level of nominal pressure, from rotational speed of motor driving pump shaft, from viscosity change of applied hydraulic oil. Article presents method of determining coefficients of axial piston pump used in typical hydrostatic drive system with proportional control. Values that can be assumed for these loss coefficients for other hydraulic pumps are also given.
    Źródło:
    Journal of KONES; 2019, 26, 1; 159-166
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measuring instruments used at the research and accuracy of defining the efficiency of drive systems
    Autorzy:
    Skorek, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/246257.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    energy efficiency
    accuracy
    measurements
    measurement results
    measuring instruments
    Opis:
    The aim of the article is to look at the possibility of accurately determining the energy efficiency of drive systems thanks to the use of high quality sensors and measuring instruments. The types of measuring instruments used on the test stand are presented. The results of experimentally determined efficiencies and simulationally determined efficiencies of two hydrostatic systems with throttling control were compared, which are fed with a constant capacity pump. The choice of the analysed systems is not accidental. There is still a view in the literature about limited possibilities of energy systems with proportional control. The research stand was very carefully designed and made. The applied measuring instruments were characterized by high accuracy of measurements. The issues related to the determination of energy losses and energy efficiency of the engine or drive system, which should be determined as dependent on the physical quantities independent of these losses, were also discussed. For laboratory verification, measurement methods were developed, the test stand was adapted and automated. It consists of tested system and loaded system. The measurements during the tests were saved on the computer disk. In order to be able to compare the efficiency of the overall system with the efficiency obtained on the basis of the simulation, coefficients ki determining the energy losses of individual elements of the system were calculated. The research showed a large convergence of the mathematical description of energy losses in the elements of the system and the efficiency of the system with reality. The mathematical model enables accurate simulation determination of the energy efficiency of the system at each point of its field of operation, i.e. at each speed and load of the controlled hydraulic motor. The range of motor speed and load variation can also be accurately determined simulationally.
    Źródło:
    Journal of KONES; 2019, 26, 2; 129-135
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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