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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analiza porównawcza wzorów na współczynnik strat liniowych w transporcie rurociągowym
    Comparative analysis of the patterns on the friction factor in pipeline transport
    Autorzy:
    Semkło, Ł.
    Urbaniak, R.
    Nygard, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/249917.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    transport rurociągowy
    straty liniowe
    pipeline transport
    linear losses
    Opis:
    Artykuł zawiera analizę porównawczą, która przedstawia możliwość zastosowania prostszego równania do obliczania współczynnika strat liniowych λ. Uproszczenie to polega na zamianie wzoru niejawnego jakim jest równanie Colebrooka-White’a na równanie mniej skomplikowane w obliczeniach. Artykuł przedstawia sześć równań, które mogą sprostać temu zadaniu.
    The article contains a comparative analysis which shows the possibility of using simple equation to calculate the coefficient of linear losses λ. This simplification consisting of the replacement the discreet pattern, which is the Colebrook-White equation to equation less complicated calculations. The article presents six equations that can cope with this task.
    Źródło:
    TTS Technika Transportu Szynowego; 2015, 12; 1366-1369, CD
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of non-linear losses in an integrated contactless power supply for magnetically levitated elevator systems using discrete circuit elements
    Autorzy:
    Putri, A. K.
    Appunn, R.
    Hameyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/141742.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    contactless energy transmission
    electromagnetic guiding system
    equivalent circuit model
    ferromagnetic material at high frequency
    magnetically levitated elevator
    modelling of non-linear losses
    Opis:
    A contactless energy transmission system is essential to supply onboard systems of electromagnetically levitated vehicles without physical contact to the guide rail. One of the possibilities to realise a contactless power supply (CPS) is by integrating the primary actuator into the guide rail of an electromagnetic guiding system (MGS). The secondary actuator is mounted on the elevator car. During the energy transmission, load dependent non-linear losses occur in the guide rail. The additional losses, which are caused by the leakage flux penetrating into the guide rail, cannot be modelled using the classical approach of iron losses in the equivalent circuit of a transformer, which is a constant parallel resistance to the mutual inductance. This paper introduces an approach for modelling the load dependent non-linear losses occurring in the guide rail using additional variable discrete circuit elements.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 2; 177-187
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy-optimal current distribution in a complex linear electrical network with pulse or periodic voltage and current signals. Suboptimal control
    Autorzy:
    Żaba, S.
    Siwczyński, M.
    Drwal, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/114274.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    L1-impulses
    linear circuits
    principle of minimum energy losses
    operators
    suboptimal control
    Opis:
    In the circuits of electrical signals belonging to the L1-impulses space or periodic signals space, occurring there real distribution of electrical currents does not meet the principle of minimum energy losses [1, 2]. The solution to this problem is to introduce the control system as current-dependent voltage sources vector, entered into a meshes set of a complex RLC network. It has been shown that the control is energy-neutral (optimal control) [2]. For energy-optimal controlling, to obtain the control operator, the inversion of R(s) operator is required. It is the matrix operator and the dispersive operator (it depends on frequency). Inversion of such operators is inconvenient because it is algorithmically complicated. To avoid this, the operator R(s) is replaced by the R’ operator which is a matrix, but nondispersive one (does not depend on s). Such control is called the suboptimal control.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 4; 125-128
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Drive optimisation of a pulsatile Total Artificial Heart
    Autorzy:
    Pohlmann, A.
    Lessmann, M.
    Finocchiaro, T.
    Fritschi, A.
    Steinseifer, U.
    Schmitz-Rode, T.
    Hameyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/140887.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sztuczne serce
    napęd liniowy
    optymalizacja
    straty
    total artificial heart
    TAH
    linear drive
    optimisation
    losses
    Opis:
    Total Artificial Hearts (TAHs) are required for the therapy of terminal heart diseases as heart transplants are only a limited option due to the available number of donor hearts. For implantation TAHs have to meet constraints regarding its dimensions, weight, perfusions and electrical losses. An innovative linear driven TAH is presented, which meets all constraints except weight. Therefore the geometry of the linear drive is optimised to reduce its weights while simultaneously limiting the electrical losses as much as possible. In order to calculate the losses, this paper introduced a combined calculation chain consisting of FEM simulations and analytical equations. Based on this chain the linear drive is optmised by the method of parameter variations. The results yield a hierachic order of parameters which are most suitable for the weight reduction of the drive for low losses. By this the weight of the linear drive is reduced by 25%. As the allowable loss limit is not exceeded yet, room for further weight reduction achieved by an optimisation of the axial geomtry parameters is given.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 2; 169-178
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the structural and total energy efficiency of selected hydraulic systems with proportional control linear motor
    Autorzy:
    Skorek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/247433.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    energy efficiency
    power of losses
    hydrostatic system
    throttling steering
    pump
    hydraulic linear motor
    proportional directional valve
    Opis:
    In the paper are presented the diagrams of the structural energy efficiency of system with the throttling control assembly and total energy efficiency of the system with constant or variable capacity pump cooperating an overflow valve with the throttling control of the linear hydraulic motor. Diagrams of total energy efficiency of three hydraulic systems working at the same parameters of speed and load of hydraulic linear motor, which were different due to structure and ability of energy saving were presented and compared. This publication also presents analyses and compares the areas of the power fields of energy losses occurring in the elements of three compared hydraulic systems with different structures of the hydraulic linear motor speed control on example on Load Sensing system. The graphical interpretation of the power of losses in the hydrostatic drive and control system elements lets to compare the same power fields of energy losses with other power fields of another structure. This enables to understand what energy losses are the biggest and in which elements of compared hydraulic systems. The best possibility to use in system, as a supply source of the hydraulic cylinder speed series throttling control assembly, is a set consisting of a variable capacity pump cooperating with a Load Sensing (LS) regulator, which totally eliminates the structural volumetric losses in a system. Power ΔPstv of structural volumetric losses is equal to zero, because the current pump capacity QP is adjusted, by the LS regulator, to the current flow intensity QM set by the throttling assembly.
    Źródło:
    Journal of KONES; 2016, 23, 2; 317-324
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence the applied control structure on energy efficiency of the hydrostatic system
    Autorzy:
    Skorek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/245430.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    energy efficiency
    power of losses
    hydrostatic system
    throttling steering
    pump
    hydraulic linear motor
    proportional directional valve
    deck machinery
    Opis:
    A control system with a proportional directional throttling control valve or a directional control servo valve, controlling a cylinder (linear hydraulic motor) is used in the ship steering gear drive, in the controllable pitch propeller control, in the variable capacity pump control system for hydraulic deck equipment motors or fixed pitch propellers in small ships (for example ferries). The hydraulic system is designed first of all taking into consideration the nominal parameters of the cylinder load and speed. For such parameters, the energy efficiency of the elements and complete system is described. Meanwhile the exploitation conditions can vary in full range changes of the cylinder load and speed coefficients. The article presents a comparison of the energy behaviour of two widespread structures of hydrostatic systems: a standard individual systems with a throttling steering fed by a constant capacity pump. Both hydraulic solutions are described and equations of the total efficiency η of the system are presented. Diagrams of energy efficiency of two hydraulic systems working at the same parameters of a speed and a load of hydraulic linear motor, which were different due to structure are presented and compared, as well ability of energy saving. This publication also presents analyses and compares the areas of the power fields of energy losses occurring in the elements of two hydraulic systems with different structures of the hydraulic linear motor speed control.
    Źródło:
    Journal of KONES; 2018, 25, 3; 411-418
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy-optimal current distribution in a complex linear electrical network with pulse or periodic voltage and current signals. Optimal control
    Autorzy:
    Siwczyński, M.
    Żaba, S.
    Drwal, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202133.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    L1-impulses
    linear circuits
    energy losses
    operators
    optimal control
    impulsy L1
    obwody liniowe
    straty energii
    operator
    optymalna kontrola
    Opis:
    The article presents that in the circuits of electrical signals belonging to the L1-impulses space or periodic signals space, real distribution of electrical currents occurs which does not meet the principle of minimum energy losses. The paper presents a solution of this problem by using the control system in the form of current-dependent voltage sources entering it into a meshes set of a complex RLC network. It has been shown that the control is energy-neutral.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 45-50
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy saving systems of hydrostatic drives for ship deck machines
    Autorzy:
    Skorek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315951.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    efektywność energetyczna
    siła strat
    układ hydrostatyczny
    sterowanie dławieniem
    hydrauliczny silnik liniowy
    energy efficiency
    power of losses
    hydrostatic system
    throttling steering
    hydraulic linear motor
    Opis:
    A control system with a proportional directional throttling control valve or a directional control servo valve, controlling a cylinder (linear hydraulic motor) is used in the ship steering gear drive, in the controllable pitch propeller control, in the variable capacity pump control system for hydraulic deck equipment motors or fixed pitch propellers in small ships (for example ferries). Energy savings in a constant capacity pump operation can be achieved by means of overflow valve controlled by the oil outlet pressure between the directional throttling control valve and the cylinder. Although structural volumetric losses cannot be eliminated in such a system, but it is possible to reduce considerably structural pressure losses, mechanical losses and volumetric losses in the pump, and mechanical losses in the cylinder too. The paper discusses these energy savings using an earlier developed by Paszota mathematical model of losses in elements, the energy efficiency of the system and the operating range of the cylinder. The paper also presents a comparison of the energy behavior of two widespread structures of hydrostatic systems: a standard individual systems with a throttling steering fed by a constant capacity pump. Both system solutions are described and equations of the total efficiency η of the system are presented. Diagrams of energy efficiency of two hydraulic systems working at the same parameters of a speed and a load of hydraulic linear motor, which were different due to structure and ability of energy saving, were presented and compared.
    Źródło:
    New Trends in Production Engineering; 2018, 1, 1; 507-514
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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