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Wyświetlanie 1-15 z 52
Tytuł:
Graphical interpretation of the power of energy losses and power developed in the hydrostatic drive and control system elements
Autorzy:
Skorek, G.
Powiązania:
https://bibliotekanauki.pl/articles/259894.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic motor
energy balance
energy losses
energy efficiency
capacity pump
hydraulic servomechanism
hydrostatic drive system
Źródło:
Polish Maritime Research; 2012, 4; 44-53
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of sum of power losses as a way for determining the ki coefficients of energy losses in hydraulic motor
Autorzy:
Maczyszyn, A.
Powiązania:
https://bibliotekanauki.pl/articles/259421.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive
power of energy losses
hydraulic rotary motor
Opis:
This paper shows application of the method of sum of power losses to determining energy losses which occur in hydraulic rotary motor in situation when not all laboratory data are at one’s disposal or when no use is made of data contained in catalogue charts. The method makes it possible to determine the coefficients, ki, of energy losses occurring in the motor. The method of sum of power losses is based on the approach proposed by Z. Paszota, in the papers [3 ÷ 9]. It consists in adding power flow of energy losses occurring in the motor to power flow output and comparing the sum to the power flow input. Application of the method is exemplified by using a A6VM hydraulic motor.
Źródło:
Polish Maritime Research; 2016, 2; 57-67
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyki mocy strat energetycznych w wybranych elementach układów hydraulicznych
Characteristics of Power of Energy Losses in Selected Elements in Hydraulic System
Autorzy:
Skorek, G.
Powiązania:
https://bibliotekanauki.pl/articles/342243.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
Tematy:
moc
straty energetyczne
sterowanie proporcjonalne
układ hydrostatyczny
silnik hydrauliczny liniowy
power
energy losses
proportional control
hydrostatic system
hydraulic cylinder
Opis:
W artykule porównano dwa układy ze sterowaniem dławieniowym, które zasilane były pompą o stałej wydajności. Poruszono tematykę związaną ze stratami energetycznymi układów hydrostatycznych z silnikami hydraulicznymi liniowymi sterowanymi proporcjonalnie rozdzielaczem proporcjonalnym. Przedstawiono i porównano wykresy mocy strat dwóch układów hydraulicznych pracujących przy tych samych parametrach prędkości i obciążenia siłownika, lecz różniących się strukturą oraz możliwością oszczędności energii.
In this article two hydrostatic systems with a throttling steering fed by a constant capacity pump were compared. The subject matter connected with an energy losses of hydrostatic systems with hydraulic linear motors controlled by proportional directional valve was presented. Diagrams of power losses of two hydraulic systems worked at the same parameters of a speed and a load of hydraulic linear motor, which were different due to structure and ability of an energy saving, were presented and were compared.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Gdyni; 2017, 100; 164-178
1644-1818
2451-2486
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Gdyni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of losses in a hydraulic motor based on the SWSB - 63 motor tests
Autorzy:
Maczyszyn, A.
Powiązania:
https://bibliotekanauki.pl/articles/259391.pdf
Data publikacji:
2010
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive and control
energy efficiency
power of energy losses
Opis:
In this paper are compared two models of energy losses: that suggested by Prof. Paszota, Z. in monograph “Energy losses in the hydraulic displacement motors – definitions and relations serving the evaluation of the efficiency of hydrostatic drive” [18] and that of Prof. Balawender, A. in “Energy analysis and methodology of testing of low-speed hydraulic motors” [1]. By using the data obtained from the tests of SWSB-63 hydraulic motors [2] the graphs which illustrate mechanical, volumetric and pressure losses in function of the parameters on which the losses directly depend [18 ], have been elaborated and showed in comparison with the description of such losses in function of the parameters assumed in [1]. The below presented text has been complemented in relation to that published in the monograph [4] and read during the scientific technical conference „Cylinder 2010” organized by the Mining Engineering Centre „Komag”, Gliwice, and held on 20÷22 September 2010 in Rytro, Poland.
Źródło:
Polish Maritime Research; 2010, 4; 46-53
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Graphical presentation of the power of energy losses and power developed in the elements of hydrostatic drive and control system. Part I. Rotational hydraulic motor speed series throttling control systems
Autorzy:
Paszota, Z.
Powiązania:
https://bibliotekanauki.pl/articles/259854.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive and control system
power of energy losses
energy efficiency
Opis:
Paper proposes and justifies a diagram of the direction of increase of power stream from the shaft or piston rod of a hydraulic motor to the pump shaft, power increasing as an effect of the imposed power of energy losses in the hydrostatic drive and control system elements. Graphical interpretation of the power of energy losses in the hydrostatic drive and control system elements and also of the power developed by those elements is presented. An individual system with the rotational hydraulic motor speed series throttling control fed by a constant capacity pump cooperating with an overflow valve in a constant pressure system p = cte . pn is analyzed and also an individual system with the rotational hydraulic motor speed series throttling control fed by a constant capacity pump cooperating with an overflow valve controlled in a variable pressure system: p = var, an individual system with the rotational hydraulic motor speed series throttling control fed by a variable capacity pump cooperating with a pressure regulator in a constant pressure system p = cte . pn and an individual system with the rotational hydraulic motor speed series throttling control fed by a variable capacity pump cooperating with the Load Sensing regulator in a variable pressure p = var system.
Źródło:
Polish Maritime Research; 2008, 3; 28-37
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Graphical presentation of the power of energy losses and power developed in the elements of hydrostatic drive and control system. Part II. Rotational hydraulic motor speed parallel throttling control and volumetric control systems
Autorzy:
Paszota, Z.
Powiązania:
https://bibliotekanauki.pl/articles/258538.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive and control system
power of energy losses
energy efficiency
Opis:
Paper presents graphical interpretation of the power of energy losses in the hydrostatic drive and control system elements and also of the power developed by those elements. An individual system fed by a constant capacity pump, where rotational hydraulic motor speed control is effected by a parallel throttling control system, is analyzed and also a system with the rotational hydraulic motor speed volumetric control by a variable capacity pump, an individual system with a rotational hydraulic motor volumetric speed control by means of a simultaneous change of the pump capacity per one revolution and change of the motor capacity per one revolution, the system operating at the constant pressure in the pump discharge conduit equal to the nominal pressure of the system: pP2 = pn and central system (with situated in parallel and simultaneously operating motors) with volumetric speed control of each rotational hydraulic motor by a motor secondary circuit assembly, the system fed by a pump with variable capacity per one shaft revolution fitted with pressure regulator pP2 = pn.
Źródło:
Polish Maritime Research; 2008, 4; 21-29
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation method and mathematical model of pressure losses in hydraulic rotary motor
Autorzy:
Maczyszyn, A.
Powiązania:
https://bibliotekanauki.pl/articles/259344.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive
power values of energy losses
hydraulic rotary motor
pressure losses
pressure efficiency
Opis:
This paper presents a way of determining the coefficient k8 of the pressure losses ΔpMp (flow drag) in internal ducts of SWSB-63 hydraulic motor. The coefficient is determined at a flow rate equal to the theoretical capacity QPt of the pump feeding the motor , the losses are related to the nominal pressure pn in the hydraulic system. The investigations followed a model of energy performance of hydraulic rotary motor, proposed by Z. Paszota.
Źródło:
Polish Maritime Research; 2018, 1; 93-98
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The opportunities for getting energy savings in the hydrostatic drive system
Autorzy:
Skorek, G.
Powiązania:
https://bibliotekanauki.pl/articles/246878.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
energy efficiency
energy losses
power
power of losses
hydrostatic system
control structures
Opis:
Full picture of the energy losses in a hydrostatic drive system is a picture of the power of energy losses in the system elements. Paper presents the areas of the power fields of energy losses occurring in the elements of some hydraulic systems with different structures of the hydraulic motor speed control. Proposed graphical interpretation allows analysing and comparing different hydrostatic drive systems. In many constructed and manufactured machines currently used hydrostatic drive systems or electro hydrostatic systems of varying complexity. Today, the need for energy-efficient systems forces to some extent the development and improvement of computational methods using computer aided relating to energy efficiency systems. Hydrostatic systems especially in modern machines play a very important role. Actuators, such as hydraulic motors, hydraulic cylinders is commonly used for a long time, including on machines and equipment land and marine. Unawareness of proportions of the energy, volumetric, pressure and mechanical losses in elements is often the case. Problems connected with energy efficiency are essential for improvement of functionality and quality of hydrostatic drive systems, characterised by unquestioned advantages. Energy efficiency of hydrostatic transmissions, particularly those with throttling control of the motor speed, and also efficiency of the hydraulic servomechanism systems may be in fact higher than the values most often quoted in publications on the subject.
Źródło:
Journal of KONES; 2014, 21, 2; 273-280
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiary mocy strat własnych wybranych liczników energii elektrycznej stosowanych w systemach SMART GRID
Measurements of running light power losses of electric energy meters used in SMART GRID systems
Autorzy:
Piaskowy, A.
Skórkowski, A.
Skubis, T.
Powiązania:
https://bibliotekanauki.pl/articles/158366.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
liczniki energii elektrycznej
inteligentne sieci elektroenergetyczne
inteligentne systemy pomiarowe
moc strat własnych
energy meters
smart grid
smart metering
running light power losses
Opis:
W artykule przedstawiono informacje dotyczące inteligentnych sieci elektroenergetycznych oraz inteligentnych systemów pomiarowych ze szczególnym uwzględnieniem zalet wynikających z ich wdrażania oraz obaw powstających na etapie projektowania i wyboru podzespołów. Zasadniczą częścią pracy są badania strat własnych wybranych urządzeń pomiarowych stosowanych w systemach smart grid, co umożliwia ich ocenę i klasyfikację. Zaprezentowano oryginalne układy pomiarowe składowych prądów wejściowych liczników dołączanych do sieci bez obciążenia, co z kolei umożliwia obliczenie mocy czynnej, biernej i pozornej strat własnych liczników. W pomiarach uwzględniono zarówno klasyczne indukcyjne liczniki energii jak i liczniki elektroniczne z różnymi modemami komunikacyjnymi.
Information on the smart grid and smart metering systems with particular emphasis on the benefits resulting from their implementation are shortly summarized in the Chapter 1. The essential part of the work are measurements of running light power loss of some chosen measuring devices, both 1-phase and 3-phase, used in smart grid systems, allowing for their assessment and classification. The essential idea of the measuring circuit consists in the measurement of real and imaginary compo-nents of small current consumed by the voltage circuit of the meter under test, while its current circuit is broken (Chap. 2). This is a normal condition of the energy meter connected to the power line, but without load. The current components to be measured are fixed in relation to the respective phase voltage. The measurements are easily and precisely performed by lock-in amplifier instrument (Figs. 2, 3). Original measuring circuits for input current compo-nents of meter voltage circuit under tests are presented. The measuring results allow to calculate the active, reactive, and apparent power losses in the meter voltage circuit. For the measurements and analysis both the common induction energy meters and modern electronic meters of various communication modems were taken into consideration (Tabs. 1, 2).
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 6, 6; 532-536
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
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:
Losses and energy efficiency of drive motors and systems. Replacement of the Sankey diagram of power decrease in the direction of power flow by a diagram of power increase oppo site to the direction of power flow opens a new perspective of research of drive motors and systems
Autorzy:
Paszota, Z.
Powiązania:
https://bibliotekanauki.pl/articles/259244.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
drive motors
drive systems
energy losses
energy efficiency
Sankey diagram
new research field
Opis:
Losses and energy efficiency of every drive motor must be presented as functions of physical quantities independent of losses in the motor. Such quantities are speed and load required by the machine or device driven by the motor, changing in the drive operating field. Speed and load of the motor decide of the instantaneous useful power of the motor and also in a differentiated way of kinds and values of losses occurring in the motor. However, losses and energy efficiency of the hydrostatic drive motors and systems are evaluated by researchers and manufacturers as functions of parameters depending on the losses. The basic cause of such situation is the traditional, commonly accepted but erroneous, view of the power flow in the drive motors and systems represented by the Sankey diagram of power decrease in the direction of power flow. It is necessary to replace the Sankey diagram by the proposed diagram of increase of power in the motor and in the drive system in the direction opposite to the direction of power flow. The proposed view of losses and energy efficiency should be applied to all types of motor and drive systems. The aim of this paper is showing the resulting problems of the above postulates, exemplified by operation of a rotational displacement motor in a hydrostatic drive system. In order to make possible objective evaluation of the energy behaviour of different motor and system solutions and sizes, the losses and energy efficiency should be described and compared as dependent on the motor speed coefficient ωM and load coefficient changing in the drive system operating field (0 ≤ ωM< ωMmax, 0 ≤ M< Mmax). The presented proposals open a new perspective of unavoidable research of drive motors and systems, making it possible to compare objectively the energy efficiency of different types of motors and drive systems.
Źródło:
Polish Maritime Research; 2013, 1; 3-10
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Optymalizacja strat energii w torze zasilania napędu trakcyjnego z zasobnikiem superkondensatorowym
Optimization of energy losses in traction vehicle power supply circuit with supercapacitor
Autorzy:
Radecki, A.
Chudzik, P.
Powiązania:
https://bibliotekanauki.pl/articles/1368788.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
straty energii
napęd trakcyjny
zasobnik superkondensatorowy
energy losses
traction vehicle power
Opis:
A concept of controlling energy flow in power supply circuit with supercapacitor of traction vehicle, designed to minimize energy losses, was presented in this article. To optimize use of energy in traction vehicle, a typical working profile of drive inverter was assumed. Waveforms of energy losses in power supply circuit with using proposed control method of supercapacitor were included.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2012, 1, 94; 43-48
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
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