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    Wyświetlanie 1-5 z 5
    Tytuł:
    Characteristics of loss power in compared hydraulic systems
    Autorzy:
    Skorek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/241595.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    power
    energy losses
    hydraulic system
    pump
    throttling valve
    cylinder
    Opis:
    In this article, two hydrostatic systems with a throttling steering fed by a constant capacity pump were compared. It also includes a subject matter connected with an energy loss power of hydrostatic systems with hydraulic cylinder controlled by proportional directional control valve. Diagrams of loss power of two hydraulic systems worked at the same parameters of a speed and a load of hydraulic cylinder, which were different due to structure and ability of an energy saving, were presented and were compared. There are possibilities to reduce energy losses in proportional control systems (in the pump, in the throttle control unit, especially in the cylinder), and thus to improve the energy efficiency of the throttling manifold. The considerations allow for comparison of the loss power resulting from the applied hydraulic control structure of the hydraulic cylinder and the power consumed by the pump from the electric motor that drives it, the power necessary to provide the required unchanged usable pump-driven hydraulic cylinder. Presents the impact on the output (useful) power of the power consumed in the considered systems, and the impact on the power consumed of the loss power in the individual elements. Instantaneous useful power of the cylinder, which is determined by the product of force and speed of the cylinder rod, is independent of all losses. There are mechanical loss power occurs in the cylinder, the loss power in the conduits, the structural volume and pressure loss power that are associated with the throttling control and loss power in the pump: pressure, volumetric and mechanical which have to be added to the useful power. As a result, the sum of the effective useful power and the loss power of all system is the instantaneous value of the power consumed by the pump from the electric motor that drives it.
    Źródło:
    Journal of KONES; 2017, 24, 2; 217-223
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy loss coefficients ki in a displacement pump and hydraulic motor used in hydrostatic drives
    Autorzy:
    Maczyszyn, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/259211.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    hydrostatic drive
    energy loss rate
    pump
    hydraulic motor
    energy loss coefficients
    Opis:
    The article aims at defining and analysing the energy loss coefficients in design solutions of rotating displacement machines, with a piston machine as an example. The energy losses observed in these machines include mechanical loss, volumetric loss, and pressure loss. The scale and relations between these losses in different machines depend on machine design and manufacturing quality, and on operating parameters. The operating parameters, in turn, which affect directly or indirectly the above losses depend on whether the machine works in pump or hydraulic motor regime. The article is also a contribution to the development of a library of ki coefficients which define the losses in displacement machines, as the knowledge about these coefficients makes it possible to assess fast and easily the energy efficiency of a machine or drive system at each point of its working area.
    Źródło:
    Polish Maritime Research; 2019, 3; 47-55
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    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:
    Effect of steering gear parameters of crawler tractor cornering ability
    Wpływ parametrów mechanizmu nawracania na zwrotność ciągnika gąsienicowego
    Autorzy:
    Zhdanovich, C.
    Mamonov, M.
    Kuboń, M.
    Kamiński, J. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/93563.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    crawler tractor
    planetary steering gear
    steering radius
    cornering ability
    hydrostatic transmission
    pump
    hydraulic motor
    ciągnik gąsienicowy
    planetarny mechanizm nawrotów
    promień nawracania
    przekładnia hydrauliczna
    silnik hydrauliczny
    Opis:
    Crawler tractor with specific loads on the hitch loses traction abilities during cornering and causes intensive destruction of the surface layer of soil. This phenomenon may be limited if relevantly selected parameters of the cornering mechanisms were applied. The objective of the paper was to determine the impact of the cornering mechanism parameters on the crawler tractor maneuver ability. The object of the research was a planetary cornering mechanism which enables fluent change of the cornering radius through the change of the rotational speed of planetary gears drive by pneumatic engines. Relations of the turning radius to the slip of the spinning and overleaping crawler at the speed of 7 km·h-1 without the load on the hitch and with the load of 40 kN were defined. The average values of drift and the turning radius as a function of drive speed from 0 to 2.5 m·s-1 on the moist soil μ=0.4 and dry soil μ=0.8 were determined. Relations of the turning radius to the pressure of oil pump oil, to the drive speed and to the load on the hitch were set forth. The research proved that when using the hydraulic pump with the regulated expense the working pressure of oil may be maximally reduced to 30 MPa, the power of the pump may be reduced by twofold, the possibility of turning in difficult field conditions within the scope of the required speed may be enabled. To ensure the required turning radius of the crawler tractor it is recommended to install the pump with the efficiency of 33 cm3·rot-1 and a regulated hydraulic motor with the capacity of 56 сm3·rot-1 with a power regulation within 2.0-2.5, at the same time maximum pressure of liquid will not exceed 35 MPa and the determined power of the hydraulic gear will amount to 52.6 kW.
    Ciągnik gąsienicowy przy określonych obciążeniach na zaczepie traci właściwości trakcyjne podczas nawrotów, przy tym powoduje intensywne niszczenie warstwy powierzchniowej gleby. Zjawisko to można ograniczyć stosując odpowiednio dobrane parametry mechanizmu nawracania. Celem badań było określenie wpływu parametrów mechanizmu nawracania na manewrowość ciągnika gąsienicowego. Przedmiotem badań był planetarny mechanizm nawracania umożliwiający płynną zmianę promienia nawrotu, poprzez zmianę prędkości obrotowej przekładni planetarnych, napędzanych silnikami hydraulicznymi. Określono zależności promienia nawrotu od poślizgów dla gąsienic buksującej i zabiegającej, przy prędkości 7 km·h-1 bez obciążenia na zaczepie i z obciążeniem wynoszącym 40 kN. Określono wartości średnie znoszenia i promienia nawrotu w funkcji prędkości jazdy, od 0 do 2,5 m·s-1, na glebie wilgotnej μ=0,4 i suchej μ=0,8. Określono zależności promienia nawrotu od ciśnienia oleju pompy olejowej, od prędkości jazdy i od obciążenia na zaczepie. Badania wykazały, że stosując pompę hydrauliczną o regulowanym wydatku można ograniczyć maksymalne ciśnienie robocze oleju do 30 MPa, zmniejszyć moc pompy 2 razy, zapewnić możliwość nawrotu w trudnych warunkach terenowych, w zakresie wymaganych prędkości jazdy. Dla zapewnienia wymaganego promienia nawrotu ciągnika gąsienicowego, zaleca się montaż pompy o wydajności 33 cm3·obr.-1 i regulowany silnik hydrauliczny o maksymalnej wydajności 56 сm3·оbr.-1, z regulacją siłową w zakresie 2,0-2,5, przy tym maksymalne ciśnienie cieczy w przekładni hydraulicznej nie przekroczy 35 MPa, a ustalona moc przekładni hydraulicznej wyniesie 52,6 kW.
    Źródło:
    Agricultural Engineering; 2016, 20, 2; 157-167
    2083-1587
    Pojawia się w:
    Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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