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    Wyświetlanie 1-36 z 36
    Tytuł:
    CFD methods as a modern tool in optimisation of hydrodynamic conditions in magma crystallizers
    Autorzy:
    Synowiec, P.
    Wójcik, J.
    Bigda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955724.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Gdańska
    Tematy:
    CFD
    crystallization
    hydraulic efficiency
    Opis:
    Selected parameters concerning the optimisation of hydrodynamics in magma crystallizers are discussed. At this stage, results of CFD (Computational Fluid Dynamics) simulations are shown, focused on the effect of the geometrical configuration of a crystallizer on energy dissipation rate, axial velocity field and general hydraulic efficiency. The influence of the shape of the apparatus' bottom, diameter of the stirrer, its location and presence of the draft tube on, respectively: (i) unit power input distribution, (ii) the average mixing power, and (iii) pumping capacity have been takeninto consideration. The results obtained from simulations have been compared with experiments and literature data.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 459-466
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of borehole design on the production and efficiency parameters of wells intaking Quaternary waters in the south of Łódź
    Autorzy:
    Macuda, J.
    Styrkowiec, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/298685.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    wellbore
    wellbore design
    technical condition of wellbore
    hydraulic efficiency
    technical diagnostics
    Opis:
    Quaternary wellbores are very liable to rapid drops of hydraulic efficiency mainly caused by clogging processes and the corrosion of the wellbore structure. The presence of such processes and their intensity largely depend on the hydrogeochemical conditions of the intaken aquifer and also the production rate and extraction method of a given wellbore. Among the major factors slowing down the hydraulic intensity are a correctly designed well, especially the properly selected type and design of the filter. A well designed wellbore filter should have low hydraulic resistance of the inflowing water and be resistant to clogging and corrosion in the given hydrochemical conditions. This allows for long and failure-free extraction of large high-production wells. The results of analyses of the effect of intake wellbore design on its hydraulic efficiency are presented in the paper. The intake wells producing Quaternary waters for waterworks in the southern part of Łódź were analyzed.
    Źródło:
    AGH Drilling, Oil, Gas; 2017, 34, 4; 895-906
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The technical and technological aspects of commissioning a new intake wells
    Autorzy:
    Macuda, J.
    Styrkowiec, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/298953.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    drilled well
    technical condition of well
    hydraulic efficiency
    diagnostics of wells
    quality of drilling
    Opis:
    Correctly performed intake wells are a warranty of long and efficient exploitation of the object. A number of important factors are involved, starting from the correct technology of drilling to proper supervision of the investor and control of realization of particular stages of work. These factors are typical of each stage of the investment process, from the stage of determining project requirements, quality of drilling to commissioning of the well. For this reason it is extremely important for the investor to establish the requirements and technical criteria which will be presented to the authors of the geological project and potential performer of the well. Geological works can be successfully verified with available diagnostic techniques, thanks to which the quality of performance can be recognized, make the contractor remove construction failures and improve the efficiency of hydraulic well before final commissioning. The necessity of performing such an analyses should be included in the budget of the planned well.Properly defined technical condition of the drilled well and evaluation of its hydraulic efficiency, being a basis for commissioning, allows the designers to select rational parameters of production and elongate a well’s life.
    Źródło:
    AGH Drilling, Oil, Gas; 2016, 33, 3; 641-649
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of gas gathering pipelines operation efficiency and selection of improvement methods
    Autorzy:
    Volovetskyi, V. B.
    Doroshenko, Ya. V.
    Kogut, G. M.
    Dzhus, A. P.
    Rybitskyi, I. V.
    Doroshenko, J. I.
    Shchyrba, O. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055762.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    gas
    gas gathering pipeline
    hydraulic efficiency
    liquid contamination
    foam
    inner cavity cleaning
    gaz
    rurociąg
    sprawność hydrauliczna
    piana
    Opis:
    Purpose: The article implies theoretical and experimental studies of the liquid pollution accumulations impact on the efficiency of gathering gas pipelines operation at the Yuliivskyi oil and gas condensate production facility (OGCPF). Research of efficiency of gas pipelines cleaning by various methods. Design/methodology/approach: The research methodology consists of determining the hydraulic efficiency of gathering gas pipelines before and after cleaning of their internal cavity by different methods and comparing the obtained results, which allows to objectively evaluate the efficiency of any cleaning method. CFD simulation of gas-dynamic processes in low sections of gas pipelines with liquid contaminants. Findings: Experimental studies of cleaning efficiency in the inner cavity of the gas gathering pipelines of the Yuliivskyi OGCPF by various methods, including: supply of surfactant solution, creating a high-speed gas flow, use of foam pistons were performed. It was established that cleaning the inner cavity of gas gathering pipelines by supplying a surfactant solution leads to an increase in the coefficient of hydraulic efficiency by 2%-4.5%, creating a high-speed gas flow by 4%-7%, and under certain conditions by 8%-10 % and more. However, for two gas pipelines the use of foam pistons allowed to increase the coefficient of hydraulic efficiency from 5.7 % to 10.5 % with a multiplicity of foam from 50 to 90. be recommended for other deposits.The results of CFD simulation showed that the accumulation of liquid contaminants in the lowered sections of gas pipelines affects gas-dynamic processes and leads to pressure losses above the values provided by the technological regime. With the increase in liquid contaminants volume the pressure losses occur. Moreover, with a small amount of contamination (up to 0.006 m3), liquid contaminants do not have a significant effect on pressure loss. If the contaminants volume in the lowered section of the pipeline is greater than the specified value, the pressure loss increases by parabolic dependence. The increase in mass flow leads to an increase in the value of pressure loss at the site of liquid contamination. Moreover, the greater the mass flow, the greater the impact of its changes on the pressure loss. The CFD simulation performed made it possible not only to determine the patterns of pressure loss in places of liquid contaminants accumulation in the inner cavity of gas pipelines, but also to understand the gas-dynamic processes in such places, which is an unconditional advantage of this method over experimental. Research limitations/implications: The obtained simulation results showed that the increase in the volume of liquid contaminants in the inner cavity of gas gathering pipelines leads to an increase in pressure losses above the value provided by the technological regime. To achieve maximum cleaning of gas gathering pipelines, it is necessary to develop a new method that will combine the considered. Practical implications: The performed experimental results make it possible to take a more thorough approach to cleaning the inner cavity of gas gathering pipelines and to forecast in advance to what extent the hydraulic efficiency of gas gathering pipelines can be increased. Originality/value: The obtained results of CFD simulation of gas-dynamic processes in lowered sections of gas pipelines with liquid contaminants, experimental studies of the effectiveness of various methods of cleaning the inner cavity of gas gathering pipelines has original value.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 107, 2; 59--74
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental effectiveness studies of the technology for cleaning the inner cavity of gas gathering pipelines
    Autorzy:
    Volovetskyi, V. B.
    Doroshenko, Ya. V.
    Tarayevs'kyy, O. S.
    Shchyrba, O. M.
    Doroshenko, J. I.
    Stakhmych, Yu. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818794.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    gas
    foam
    gas gathering pipeline
    hydraulic efficiency
    cleaning the inner cavity of pipelines
    gaz
    piana
    rurociąg
    sprawność hydrauliczna
    Opis:
    Purpose: The purposes of the article are to determine the hydraulic efficiency of two gas gathering pipelines of the Yuliivskyi oil and gas condensate production facility (OGCPF) and develop a set of measures to increase it; to experimentally determine the efficiency of using foams to increase the hydraulic characteristics of the gas gathering pipelines in the Yuliivskyi OGCPF; to develop a set of measures that will help to improve the hydraulic characteristics of gas gathering pipelines. Design/methodology/approach: The research methodology consists in determining the hydraulic efficiency of gas gathering pipelines before and after cleaning their inner cavity with foams with different expansion ratios and comparing the obtained values, which allows to objectively assess the efficiency of this cleaning method. The studies were performed within the framework of research and development work by the specialists of the Ukrainian Scientific Research Institute of Natural Gases. Findings: The pilot testing was carried out to determine the efficiency of cleaning the inner cavity of gas gathering pipelines with foams with different expansion ratios. It showed positive results. It was determined that cleaning the inner cavity of gas gathering pipelines with foams with the expansion ratio from 80 to 90 led to an increase in the hydraulic efficiency coefficient by 10.5%, and with foams with the expansion ratio from 50 to 60 - by 5.7%. The measures taken to clean the inner cavity of gas gathering pipelines from liquid contaminations have proven their efficiency and can be recommended for other fields. Research limitations/implications: The obtained results show that it is reasonable to conduct the experimental studies on the efficiency of cleaning the inner cavity of gas gathering pipelines with the foams with higher expansion ratios. To achieve the maximum quality of cleaning the gas gathering pipelines, it is necessary to develop a new method that will combine the use of foam and gel piston.Practical implications: The performed experimental studies help to take a more reasonable approach to cleaning the inner cavity of gas gathering pipelines with foams and to predict in advance the effect of the foam expansion ratio on the hydraulic efficiency of gas gathering pipelines. Originality/value: The experimental studies on the effect of foam expansion ratios on the hydraulic efficiency of gas gathering pipelines are original.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 105, 2; 61--77
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing a set of measures to provide maximum hydraulic efficiency of gas gathering pipelines
    Autorzy:
    Volovetskyi, V. B.
    Uhrynovskyi, A. V.
    Doroshenko, Ya. V.
    Shchyrba, O. M.
    Stakhmych, Yu. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/368779.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    well
    gas
    gas gathering pipeline
    hydraulic efficiency
    cleaning the inner cavity of pipelines
    studnia
    gaz
    rurociąg
    sprawność hydrauliczna
    Opis:
    Purpose: The purposes of this article are to study the effective ways of increasing the hydraulic efficiency of gas gathering pipelines of the Yuliivskyi oil and gas condensate production facility (OGCPF); to calculate the operation efficiency of gas gathering pipelines of the Yuliivskyi OGCPF and develop a set of measures to monitor their condition and improve their hydraulic characteristics; to investigate the technology of cleaning the inner cavity of flowlines of gas-condensate wells with foam, to perform the feasibility study on the prospects of its application in practice. Design/methodology/approach: The technology of cleaning the inner cavity of flowlines of gas-condensate wells with foam was investigated to objectively evaluate its application and determine the effectiveness of this measure. The research was carried out within the framework of research and development work by the specialists of the Ukrainian Scientific Research Institute of Natural Gases. Findings: The results of production studies showed that due to cleaning the flowlines of gas-condensate wells (No.85 and No.60) from the accumulation of liquid, the coefficients of their hydraulic efficiency increased by 12% and 7%, respectively. Measures taken to clean the inner cavity of the flowlines from liquid have proven their efficiency and can be recommended for other flowlines of wells at other production fields. Research limitations/implications: Based on the characteristics of gas gathering pipelines, it is reasonable to conduct experimental studies on the use of the proposed technology of cleaning the inner cavity with foam in the case of increasing its multiplicity. Practical implications: Using the wells of the Yuliivske oil and gas condensate field as case studies, the operating parameters were measured and the pressure losses along the length of the flowlines were calculated. According to the results of calculations at two wells (No.85 and No.60), a significant excess of the actual value of the flow friction characteristic over the theoretical value was established. To reduce excessive pressure losses due to the presence of liquid and improve the hydraulic characteristics of the wells, their inner cavities were cleaned using foam with the expansion ratio from 40 to 100. Originality/value: It is important to note that the advantages of foam piston include: ease of use, no occurrence of hydraulic shocks and preventing stuck during movement in the gas pipeline, application in both straight and inclined sections, no wear of the elements of the cleaning equipment, a rather efficient cleaning of gas pipelines.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2020, 101, 1; 27-41
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza hydrauliczna zjawisk wywołujących zmniejszenie przepływności rurociągów
    Hydraulic analysis of phenomena reducing pipeline flowability
    Autorzy:
    Kotowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/236648.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
    Tematy:
    rurociąg wodny
    korozyjność wody
    inkrustacja
    chropowatość rurociągu
    opór przepływu
    sprawność hydrauliczna
    water pipelines
    water corrosivity
    incrustation
    pipelines roughness
    flow resistance
    hydraulic efficiency
    Opis:
    Rurociągi wodne w czasie eksploatacji ulegają korozji i inkrustacji, będących skutkiem niestabilności chemicznej wody wodociągowej. Wykazano, że badania korozyjności wody wodociągowej mogą być pomocne do wstępnej oceny wzrostu oporności hydraulicznej rurociągów, pod warunkiem braku istotnych zmian jakości wody w badanym cza-sie. Najistotniejszy wpływ na zmniejszenie przepływności rurociągów ma już niewielki wzrost chropowatości ścian przewodów, w porównaniu do rur hydraulicznie gładkich. Jednak przy dużej chropowatości ścian rurociągu spadek jego przepływności wynika już głównie z fizycznego zmniejszenia przekroju rurociągu, a tylko w niewielkiej części z oporów ruchu. Na drodze analitycznej i doświadczalnej dowiedziono, że uzależnienie wartości współczynnika szorstkości (n) we wzorze Manninga od liczby Reynoldsa i chropowatości (k) czyni tę metodę wymiarowania rurociągów równie dokładną, jak metoda oparta na wzorach Darcy-Weisbacha i Colebrooka-White'a.
    While in service, water pipelines undergo corrosion and develop incrustations, which is attributable to the chemical instability of tap water. This study reports the following findings. Tap water corrosivity tests can be regarded as a useful tool for the preliminary estimation of the increase in pipeline roughness, provided that no significant changes in water quality were observed at the time of the research. Compared to smooth pipes (in hydraulic terms), even a slight increase in the wall roughness of the pipes becomes a substantial contributing factor in the decrease of pipeline flowability. At a high wall roughness, the decrease in the flowability of the pipeline is attributable primarily to the physical reduction in the pipe cross-section; the contribution of flow resistance is less important. The author has demonstrated, both by analysis and by experiments, that relating the value of the roughness coefficient (n) in Manning's equation to Reynolds number and roughness (k) renders this method of pipeline dimensioning as accurate as the method based on Darcy-Weisbach and Colebrook-White equations.
    Źródło:
    Ochrona Środowiska; 2010, 32, 1; 27-32
    1230-6169
    Pojawia się w:
    Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sprawność hydrostatycznych układów napędowych o złożonej strukturze
    Efficiency of hydrostatic drive systems with a complicated structure
    Autorzy:
    Zastempowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2071568.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    napęd hydrostatyczny
    sprawność układów hydrostatycznych
    struktura ukłdów hydrostatycznych
    hydrostatic drive
    hydraulic system efficiency
    hydrostatic system structure
    Opis:
    W artykule przedstawiono ocenę sprawności dowolnie złożonych układów hydraulicznych, w których cieczą roboczą jest woda. Najkorzystniejszym napędem płynowym dla przemysłu spożywczego jest napęd hydrostatyczny, w którym cieczą roboczą jest woda. Czysta woda jest idealnym medium spełniającym warunki higieniczno-sanitarne. Wodne układy hydrostatyczne mają często złożoną strukturę z uwagi na fakt, że z jednej pompy zasilanych jest wiele odbiorników energii (silników).
    A procedure of fast assessment of hydrostatic system efficiency for a complicated system structure with water as drive fluid is presented in the paper. The best drive fluid for food industry is water as working fluid. Clean water is ideal vehicle fulfilling hygienic and health conditions. However, water systems have often a very complicated structure caused by the situation that one pump usually supplies many hydrostatic receivers.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2011, 3; 87-88
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation and experimental research of hydraulic losses of an energy converting flow machine with rotating piston
    Autorzy:
    Nozdrzykowski, K.
    Komorowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/135380.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    energy-converting machine
    rotating pistons
    imulation of hydraulic losses volumetric efficiency
    comparative analysis
    correlation and integral calculi
    Opis:
    This article describes the construction and principles of operation of a prototype energy-converting machine – a flow machine with pistons rotating in toroidal spaces. A comparative analysis of the results of simulation and experimental tests of fluid flow resistance in the presented prototype machine has been performed with the use of correlation and integral calculi. The article also presents a comparative analysis of the volumetric efficiency of the examined pump and of a Vogelsang pump with similar design and size. The present state of the research makes it possible draw conclusions about the high exploitation value of the proposed pump construction. For this displacement pump, performance increases along with rotational speed. However, it is different from other pumps by virtue of is simple and compact construction as well as greater capacity in relation to its size.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 54-58
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The exergetic analysis for predicting of energy efficiency of the hydraulic drive systems
    Prognozirovanie ehnergoeffectivnosti sistemy gidroprivoda na osnove ehksergeticheskogo analiza
    Autorzy:
    Yakhno, O.
    Gubarev, A.
    Ganpantsurova, O.
    Murashhenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/77647.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    hydraulic drive
    hydraulic calculation
    temperature
    viscosity
    energy efficiency
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 5
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental testing of the influence of the operating loading on the flow characteristics of hydraulic pump
    Autorzy:
    Kosiba, Ján
    Tkáč, Zdenko
    Jablonický, Juraj
    Shcherbak, Valeriia
    Ganushchak-Yefimenko, Liudmyla
    Paumer, Martin
    Bukoros, Tetiana
    Čurgaliová, Gabriela
    Zachar, Martin
    Powiązania:
    https://bibliotekanauki.pl/articles/2175138.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    hydraulics
    hydraulic device
    flow efficiency
    Opis:
    The contribution deals with the influence of the operating loading on the flow characteristics of the hydraulic pump under laboratory conditions. In the test, a new toothed hydraulic pump and hydraulic oil with kinematic viscosity at 40°C, ν = 64.2 mm2.s-1 were used. The operational loading was measured during the most difficult agrotechnical operation – ploughing, at which the loading of the hydraulic pump is the greatest. Laboratory testing was determined for 200 hours, and the flow characteristics had been detected at 50 hours intervals. Measurement of the flow characteristics was performed at rated speed n = 1,000 rpm. Measurement of the flow characteristics was carried out in dependence on the loading pressure from p = 0 MPa to p = 20 MPa. When p = 0 MPa, the value reached n = 91.70% and when p = 20 MPa, n = 86.68%. Running-in of the hydraulic pump lasted 150 hours, with an increase of the flow characteristics Δηvol = 1.36% (p = 10 MPa) compared to the initial state. After working for 200 hours, the flow rate of the hydraulic pump decreases compared to 150 hours.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 3; 583--589
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated model of hydraulic fracturing and hydro-carbon production
    Autorzy:
    Stopa, J.
    Wojnarowski, P.
    Janiga, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/298591.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    hydraulic fracturing
    reservoir simulation
    efficiency estimation
    Opis:
    The dynamics of discovering conventional hydrocarbon reservoirs has significantly dropped down in the World over the last ten years. Resources deposited in reservoirs having poor properties, where the production with economically justified yield is possible after prior enhancement (hydraulic fracturing in particular), become more important. Accordingly, proper designing of development works and hydraulic fracturing are decisive. Author's methodic and software for integrated modeling of hydraulic fracturing and production with the use of a3D fracture model are presented in this paper. This can be used for evaluating the efficiency of the fracturing treatment and its optimization. The results of hydraulic fracturing modeling were implemented in the reservoir simulator with the software written in C++. The designed fracture can be introduced into a numerical grid of a reservoir simulator. This tool can be a choice for a quick variant simulation for the best scenario of reservoir development selection. The practical implementation of this program was presented on the example of a ,tight gas' reservoir.
    Źródło:
    AGH Drilling, Oil, Gas; 2014, 31, 1; 49-57
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy losses in the hydraulic rotational motor definitions and relations for evaluation of the efficiency of motor and hydrostatic drive
    Autorzy:
    Paszota, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/259279.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    hydrostatic drive
    hydraulic motor
    energy efficiency
    Opis:
    The evaluation methods of energy losses and efficiency of the hydraulic rotational motors for the hydrostatic drives, used so far in the scientific research and in the industrial practice, give wrong results because the parameters that the losses and efficiencies are a function of are themselves dependent on those losses. The aim of the paper is to define the motor operating parameters, developed powers, energy losses and efficiencies and also to show the respective relations. Conclusions are drawn, based on the analyses of presented definitions and relations, on the motor energy investigations.
    Źródło:
    Polish Maritime Research; 2010, 2; 44-54
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of energy efficiency improvement by modernisation of hydraulic installations at a fishing cutter at the baltic sea
    Autorzy:
    Szczepanek, M.
    Barta, D.
    Michalska-Pożoga, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315958.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    fishing cutter
    hydraulic installation
    energy efficiency
    Opis:
    The Energy Efficiency Design Index (EEDI) became mandatory for new ships as well as the Ship Energy Efficiency Management Plan (SEEMP) for all ships due to the MEPC 62 (July 2011) along with the adoption of amendments to MARPOL Annex VI by the Parties to the MARPOL Annex VI. This was the first legally binding climate change treaty to be adopted since the Kyoto Protocol. The Ship Energy Efficiency Management Plan (SEEMP), which has been obligatory since 2013, did not to cover fishing cutters but triggered the implementation of energy efficiency audits due to fishing limits, high fuel prices, and free freight market. All the above caused that ship-owners started seeking ways for saving money and keep their business profitable. Apart from energy recovery installations, fishing vessels have been furnished with the latest technologies aimed at the reduction of energy consumption and at making ships greener. A research team of the Maritime University of Szczecin conducted energy efficiency audits on several fishing vessels operated on the Baltic Sea and stated that up to 40% of the energy is used during fishing operations by hydraulic devices installed at the fishing vessels. The paper presents the measurement results of energy consumption in typical operational states based on a selected fishing cutter operating at the Baltic Sea. The paper includes also the recommendations in terms modernization of hydraulic installations and the changes of control methods for devices with hydraulic drive. The calculations are also presented herein and they prove that it is possible to reduce energy consumption by a fishing cutter even by 20% while maintaining the unchanged operating parameters of the hydraulic devices.
    Źródło:
    New Trends in Production Engineering; 2018, 1, 1; 561-566
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical and mathematical models of the torque of mechanical losses in a hydraulic rotational motor for hydrostatic drive
    Autorzy:
    Paszota, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/258728.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    hydrostatic drive
    hydraulic motor
    energy efficiency
    Opis:
    The paper presents theoretical and mathematical models of the torque of mechanical losses in a hydraulic rotational motor with constant capacity qMt per one shaft revolution (with constant theoretical working volume VMt) and with variable capacity qMgv = bM qMt per one shaft revolution (with variable geometrical working volume VMgv). The models are to be used in the laboratory and simulation investigations of motor energy losses aimed at evaluation of the motor energy efficiency and hydrostatic drive efficiency.
    Źródło:
    Polish Maritime Research; 2010, 3; 18-25
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Modeling of an Experimental Hydraulic Device
    Autorzy:
    Tkáč, Z.
    Halenár, M.
    Kosiba, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2065018.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    hydraulic fluid
    flow rate
    flow rate efficiency
    Opis:
    The design of the experimental laboratory device is based on the construction of the hydraulic circuits of mobile devices. It is possible to ensure the repeatability of the flow characteristic measurements at the laboratory. This means that in the operating test it is possible to verify the flow characteristics of the hydraulic pump and these results are not affected by the change in the physical properties of the applied liquid. By comparing of the flow characteristics directly on the work equipment (mini-excavator, etc.), the disadvantage is the need for dismantling the hydraulic pump and its mounting on the laboratory device. In some working device removal is not possible, where dismantling is structurally difficult or is time consuming, which increases the cost of their operation.The proposed experimental laboratory device serves to verify the flow characteristics of the hydraulic pump and is also designed to be universal, to test external gear hydraulic pump and hydraulic pump with inclined plate.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 63--68
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the influence of hydraulic oil temperature on the variable-speed pump performance
    Autorzy:
    Stawiński, Łukasz
    Kosucki, Andrzej
    Cebulak, Maciej
    Górniak vel Górski, Adrian
    Grala, Mikołaj
    Powiązania:
    https://bibliotekanauki.pl/articles/2087011.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    hydraulic pump
    volumetric efficiency
    temperature-dependent characteristics
    variable speed drive
    hydraulic oil
    Opis:
    This paper describes investigation on the influence of hydraulic oil temperature on the performance of a hydraulic pump. The aim of the research is to determine changes in volumetric efficiency of the pump in the form of maps of operation at different temperatures of the hydraulic oil, in conditions of variable speed and pressure. The described tests were carried out on an experimental stand with a hydraulic fixed-displacement gear pump controlled by a servo motor. Based on the signals from the sensors processed with the LabVIEW program, maps of the hydraulic pump operation were drown in a wide range of speeds and temperatures. The paper presents the results of the research and based on this the conclusions regarding the main aim of the research and others that were observed during the measurements were presented. The most important conclusion from the study shows that the temperature-dependent characteristics provide users with a significant amount of information such as operating conditions that will ensure a high level of efficiency.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 2; 289--296
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification the mathematical model of energy efficiency of hydraulic system
    Autorzy:
    Skorek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/245887.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    hydraulic systems
    hydraulic transmission
    energy efficiency
    constant capacity pump
    energy losses
    mathematical model
    Opis:
    The article presents the laboratory verification of the mathematical description of losses and energy efficiency of the hydraulic transmission with proportionally controlled cylinder supplied by the constant capacity pump in the system of constant pressure is presented. The axial piston pump with pivoting rotor supplied to the system consisted of proportional directional control valve and linear motor – hydraulic cylinder at constant pressure, cooperating with an overflow valve. The choice of the analysed system is not accidental. There is always a view in literature about the very limited energy capabilities of a proportional control system. For this purpose, measurement methods were developed and a test stand was adapted. It consists of two systems: tested and loading. Measurements during the tests were recorded up to date on the computer hard disk. In order to allow for comparison of the total efficiency of the system with the efficiency derived from the simulation, the ki coefficients determining the energy losses of the individual components were calculated. Investigations have shown a high convergence mathematical description of energy losses in the elements of the system efficiency and reality. This allows accurate simulation determining the energy efficiency of the field at every point in its operation, i.e. at any speed and any load-controlled hydraulic cylinder. The speed and load range of the hydraulic cylinder can also be accurately simulated.
    Źródło:
    Journal of KONES; 2017, 24, 3; 275-281
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    The influence of pressure drop on the working volume of a hydraulic motor
    Autorzy:
    Śliwiński, Pawel
    Powiązania:
    https://bibliotekanauki.pl/articles/2200940.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    theoretical working volume
    actual working volume
    hydraulic motor
    satellite
    motor
    volumetric efficiency
    mechanical efficiency
    Opis:
    Reliability and maintenance analysis of hydraulic positive machines basicly focused on the processes of their wear and failure. But in order to correctly assess the mechanical and volumetric efficiency of a hydraulic motor, both at the stage of development research or at the stage of control tests during its exploitation, the working volume of this motor must be correctly determined. Therefore this paper proposes a new method of assessment of the size of the working volume of a hydraulic motor. It has been shown that the hydraulic motor absorbency per one revolution of this motor shaft is a non-linear function of pressure drop in working mechanism of the motor and non-linear function of motor rotational speed. Thus the relation between the working volume of a hydraulic motor and the pressure drop in the motor working mechanism is a non-linear function. This working volume as a funcition of pressure drop has been called the actual working volume. The correctness of the proposed method was confirmed experimentally.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 4; 747--757
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ресурс гидроцилиндров по несущей способности
    Resources of hydrocylinders on bearing capacity
    Autorzy:
    Kobzov, D. U.
    Kobzov, A. U.
    Lhanag, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2068278.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    nośność
    efektywność
    cylinder hydrauliczny
    siłownik hydrauliczny
    bearing capacity
    efficiency
    hydraulic cylinder
    Opis:
    Анализ напряженно-деформированного состояния гидроцилиндра позволяет установить направления его модернизации с целью повышения несущей способности длинномерных элементов и увеличения ресурса машины.
    The analysis of the intense-deformed condition of the hydrocylinder allows to establish directions of its modernization with objective of increase of bearing capacity of lengthy elements and increases of a between-repairs cycle.
    Źródło:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2011, 17 (167); 80-90
    0860-7214
    Pojawia się w:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the influence of hydraulic fluid quality on external gear pump performance
    Autorzy:
    Novaković, Borivoj
    Radovanović, Ljiljana
    Zuber, Ninoslav
    Radosav, Dragica
    Đorđević, Luka
    Kavalić, Mila
    Powiązania:
    https://bibliotekanauki.pl/articles/2087006.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    hydraulic system
    press
    fluid
    oil
    degradation
    filtration
    external gear pump
    measurement
    efficiency
    Opis:
    The basis of every hydraulic system is based on energy transformations, which are realized through hydraulic working fluid. Hydraulic oils are certainly subject to changes within their structure, meaning the basic characteristics and parameters of hydraulic oil, such as density, viscosity, humidity. The oils that are exploited are exposed to the process of degradation, which largely leads to significantly poorer quality of hydraulic fluid. The paper deals with the influence of changes in the characteristics of the hydraulic fluid on the hydraulic operating parameters of the gear pump installed on the hydraulic press. The parameters refer to pressure, flow, and temperature, as well as the quality of hydraulic oil, which affects the volumetric efficiency of the pump, and the results presented in the conclusion are based on the measured values of parameters before and after corrective measures. The control of parameters aims to increase the efficiency and reliability of the hydraulic system, a way of modern detection of deviations of parameters from standard, required values.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 2; 260--268
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optymalizacja trasy przejazdu samochodu z hydraulicznym dźwigiem samochodowym podczas załadunku drewna
    Optimization of the route of a truck with a hydraulic crane during loading of wood
    Autorzy:
    Szada-Borzyszkowski, W.
    Szada-Borzyszkowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/316347.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    efektywność transportu
    transport drewna
    dźwig hydrauliczny
    transport efficiency
    timber transport
    hydraulic crane
    Opis:
    W artykule przedstawiono projekt usprawnienia przebiegu tras przejazdu samochodów z hydraulicznym dźwigiem samochodowym. Omówiono proces załadunku i transportu drewna. Zaprezentowano trasy przejazdu samochodów z hydraulicznym dźwigiem samochodowym realizujących załadunek w różnych obszarach firmy.
    The article presents a plan to improve the course of routes of a truck with hydraulic crane. The process of loading and transporting wood is covered. The routes of truck with a hydraulic crane that perform loading in various areas of the company are presented.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 9; 97-100
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction losses in a linear hydraulic motor as a result of the influence of the control structure and oil viscosity
    Autorzy:
    Skorek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/241950.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    friction force
    mechanical losses
    energy efficiency
    oil viscosity
    hydrostatic drive
    hydraulic cylinder
    Opis:
    The problem of energy tests of hydraulic systems with hydraulic cylinders, seemingly simple displacement machines, is more complex than that of rotary hydraulic systems. The results of the researches provide an insight into the impact of external loads, required speed, structure of the power supply system, viscosity of hydraulic oil on friction loss, and the efficiency of cylinder drive. The hydraulic cylinder is the strongest structure in the system. Failure of the system is most likely due to failure of the pump supplying the cylinder. The high load of the pump is often caused by the very low energy efficiency of the cylinder, which, despite a relatively low external load, requires high inlet pressure due to large mechanical losses of friction between the piston and the cylinder and between the piston rod and gland. These losses depend on the type of seal used, its shape, the material it is made from, pre-clamp, and the operating parameters of the cylinder. Improperly sealed or assembled seals can cause energy losses of up to 25%. Due to the use of moving seals in the hydraulic cylinder, its energy behaviour is completely different compared to the energy behaviour of a rotary motor, which does not have any seals. The friction force connected with the work of the sealing joints and the mechanical efficiency of the cylinder are determined not only by the external load but also by the method of the applicable supply of the cylinder resulting from the throttling structure, and in particular the pressure level generated in the discharge chamber of the cylinder.
    Źródło:
    Journal of KONES; 2018, 25, 4; 377-384
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new approach to using the classic pressure-time method of discharge measurements
    Autorzy:
    Adamkowski, A.
    Janicki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/175412.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hydraulic turbine
    penstock
    discharge measurement
    pressure-time method
    Gibson method
    efficiency test
    Opis:
    Discharge measurement using the pressure-time (Gibson) method typically involves mounting measurement instrumentation on the outside of the penstock. In the case of a hydropower plant where the penstock is built over concrete, an innovative approach is necessary in order to install instrumentation inside the penstock. Such instrumentation has been implemented for the purpose of efficiency tests of the upgraded small Kaplan turbine. The pressure-time method, in its classic version, requires sending pressure signals from both penstock cross-sections to the differential pressure transducer by means of connecting tubes. This raises the question on the influence exerted by dynamic properties of the connecting pipes/transducer system on the discharge measurement results. Calculations carried out using previously developed method enable authors to demenstrate that the connecting pipes/transducer system had exerted a negligible influence on the discharge measurement results.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2011, 123; 57-70
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    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:
    Analiza wpływu nieosiowego położenia par obrotowych siłownika na sprawność mechaniczną
    Analysis of the effect of hydraulic cylinder rotational couplings unalignment on its mechanical efficiency
    Autorzy:
    Stępniewski, A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/287012.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    siłownik
    tarcie
    sprawność mechaniczna
    samohamowność
    hydraulic cylinder
    rotational pairs
    friction
    mechanical efficiency
    self-locking
    Opis:
    Przeanalizowano wpływ błędu położenia osi par obrotowych mocowania siłownika na sprawność mechaniczną. Założono, że siły reakcji działają pomiędzy pierścieniami tłoka i cylindrem lub siły reakcji działają pomiędzy pierścieniem tłoka i cylindrem i pomiędzy tłoczyskiem i uszczelnieniem. Zamodelowano cztery warianty błędnego położenia środków par obrotowych, gdy błąd położenia dotyczy jednej z par (cylindra lub tłoczyska) i obu par jednocześnie a osie par obrotowych znajdują się po tej samej lub przeciwnych stronach osi siłownika. Siły tarcia obliczono iteracyjnie z warunków równowagi statycznej. Wyznaczono przebiegi sprawności oraz wymiary odległości osi par obrotowych od osi siłownika, dla których połączenie jest samohamowne.
    The effect of axial alignment of hydraulic cylinder rotational pairs on its mechanical efficiency was analyzed. It was assumed that the reaction forces appear between piston rings and cylinder as well as between piston rod and the sealing. Four variants of unalignment were modeled: only one rotational pair is unaligned to cylinder axis (two cases) and both rotational pairs are shifted from cylinder axis (including two options – the shift to opposite direction or to the same direction). The friction forces were iteratively computed for the static balance conditions. Computed mechanical efficiency was plotted as a function of unalignment (normalized) for the interval from zero to value of device self-locking (when the efficiency is equal zero).
    Źródło:
    Inżynieria Rolnicza; 2005, R. 9, nr 8, 8; 367-375
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Define the operational hydro-solid waste handling system
    Оpredelenie rezhima raboty gidrotransportnojj sistemy peremeshhenija tverdykh otkhodov
    Autorzy:
    Chernetskaya-Beletskaya, N.
    Kushchenko, A.
    Varakuta, E.
    Shvornikova, A.
    Kapustin, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/792664.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    hydraulic fluid
    power
    speed
    hydrotransport system
    handling system
    slurry flow
    solid waste
    energy efficiency
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 1
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The operating field of a hydrostatic drive system parameters of the energy efficiency investigations of pumps and hydraulic motors
    Autorzy:
    Paszota, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/259125.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    hydrostatic drive and control
    pumps
    hydraulic motors
    Sankey diagram
    energy efficiency
    laboratory and simulation investigations
    Opis:
    The operating field of hydrostatic drive system is presented. Subdivision of the hydraulic motor and pump work parameters into parameters independent of and dependent on the operation of displacement machines and the system is justified. A research project is proposed aimed at development of methods determining the energy characteristics of pumps and rotational hydraulic motors as well as modified methods of determining the energy characteristics of hydrostatic drive systems with selected structures of hydraulic motor speed control. The paper is an extended version of reference [11].
    Źródło:
    Polish Maritime Research; 2009, 4; 16-21
    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:
    Metodyka badań i model matematyczny strat ciśnieniowych w silniku hydraulicznym obrotowym
    Autorzy:
    Maczyszyn, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/303007.pdf
    Data publikacji:
    2017
    Wydawca:
    Wydawnictwo Druk-Art
    Tematy:
    napęd hydrostatyczny
    moce strat energetycznych
    silnik hydrauliczny obrotowy
    straty ciśnieniowe
    sprawność ciśnieniowa
    hydrostatic drive
    power losses
    rotary hydraulic motor
    pressure losses
    pressure efficiency
    Opis:
    W artykule przedstawiono sposób określania współczynnika k8 strat ciśnieniowych ΔpMp (oporów przepływu) w kanałach wewnętrznych silnika hydraulicznego SWSB-63, współczynnika wyznaczonego przy natężeniu przepływu równym teoretycznej wydajności QPt pompy zasilającej silnik, strat odniesionych do ciśnienia nominalnego pn układu hydraulicznego. Nawiązano do modelu zachowania energetycznego silnika hydraulicznego obrotowego zaproponowanego przez Z. Paszotę.
    The article presents the method of determining the coefficient k8 of pressure losses ΔpMp (flow resistance) in the hydraulic motor channels type SWSB-63. The coefficient determined at the working liquid intensity in the channels is equal to the pump theoretical capacity QPt and losses related to the nominal pressure pn of the hydraulic system. It was related to the energy conservation model of rotary hydraulic engine proposed by Z. Paszota.
    Źródło:
    Napędy i Sterowanie; 2017, 19, 12; 90-95
    1507-7764
    Pojawia się w:
    Napędy i Sterowanie
    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
    Tytuł:
    Continuously variable transmission leakage test results
    Autorzy:
    Goszczak, Jarosław
    Radzymiński, Bartosz
    Mitukiewicz, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/105918.pdf
    Data publikacji:
    2019
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    passenger car‘s driveline
    power loss
    efficiency improvement
    continuously variable transmission
    hydraulic control system
    leakage values
    układ napędowy samochodu osobowego
    strata mocy
    poprawa wydajności
    przekładnia bezstopniowa
    hydrauliczne układy sterowania
    Opis:
    After a short introduction characterizing the general outline of the issue, this paper describes the test results of oil leakage measurements through CVT actuator seals. The research was done using Jatco company's CVT 7model, the popular gearbox for small passenger cars. Several curves of leakage values are given for both actuators, concerning different conditions such as rotational speed, oil temperature or pressure. In the summary several conclusions are formulated, based on presented test results. The determined maximal value of leakage is about 1 l/min. It emerged that the influence of centrifugal force is negligible. What is more, the observed phenomena are shortly described and projected for more detailed investigation.
    Źródło:
    Acta Innovations; 2019, 31; 5-13
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza ćwiartkowego modelu zawieszenia pojazdu z tłumikiem hydraulicznym
    The analysis of the quarter model of the vehicle suspension with the hydraulic damper
    Autorzy:
    Ferdek, U.
    Łuczko, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/404310.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Symulacji Komputerowej
    Tematy:
    analiza modelu
    ćwiartkowy model zawieszenia pojazdu
    zawieszenie pojazdu
    tłumik hydrauliczny
    bezpieczeństwo jazdy
    efektywność tłumienia drgań
    model analysis
    quarter model of the vehicle suspension
    vehicle suspension
    hydraulic damper
    driving safety
    efficiency of shock absorber
    Opis:
    W pracy poddano analizie jakościowej ćwiartkowy model zawieszenia pojazdu. Występujący w układzie zawieszenia tłumik hydrauliczny opisano zmodyfikowanym modelem Spencera. Na podstawie przeprowadzonych analiz wyselekcjonowano parametry mające decydujący wpływ na kształt charakterystyki tłumika. Wyznaczono również charakterystyki częstotliwościowe układu w celu zbadania wpływu istotnych parametrów modelu na wprowadzone wskaźniki jakości związane z bezpieczeństwem jazdy oraz efektywnością tłumienia drgań.
    The paper discusses the analysis of the quarter model of the vehicle suspension. The hydraulic damper existing in the suspension system has been described using the modified Spencer model. Based on the performed analyses, the parameters having the major impact on the shape of the damper characteristics have been chosen. Additionally, the frequency characteristics of the model have been investigated, for the purpose of researching the impact of several essential model parameters on the performance factors corresponding to the driving safety and the efficiency of the shock absorber.
    Źródło:
    Symulacja w Badaniach i Rozwoju; 2011, 2, 2; 67-74
    2081-6154
    Pojawia się w:
    Symulacja w Badaniach i Rozwoju
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability modeling based on power transfer efficiency and its application to aircraft actuation system
    Model niezawodności oparty na wydajności przesyłu energii i jego zastosowanie do oceny lotniczego układu hydrauliki siłowej
    Autorzy:
    Cui, Xiaoyu
    Li, Tongyang
    Wang, Shaoping
    Shi, Jian
    Ma, Zhonghai
    Powiązania:
    https://bibliotekanauki.pl/articles/946137.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    reliability modeling
    power transfer efficiency
    multi-state performance
    dual hydraulic actuation system
    generalized stochastic Petri nets
    universal generating function
    modelowanie niezawodności
    wydajność przesyłu energii
    działanie systemu wielostanowego
    podwójny układ hydrauliki siłowej
    uogólnione stochastyczne sieci Petriego
    uniwersalna funkcja tworząca
    Opis:
    The power transfer systems (PTS) has special reliability properties, including multiple states and fault dependence. Consequently, traditional binary-state reliability modeling methods cannot accurately evaluate the reliability of PTS. In order to resolve the contradiction between terminal energy demand and power transfer capability of PTS, this paper proposes a novel multi-state reliability model based on power transfer efficiency (PTE) for reliability evaluation of PTS. The multi-state model caused by performance degradation based on PTE is considered in this paper. In addition, the failure correlation in virtue of the system structure and energy allocation mechanism is analyzed in the proposed model, and the corresponding reliability evaluation result is obtained under different terminal energy requirements. The approach is verified on the example of a dual hydraulic actuation system (DHAS), in which the stochastic model based on the generalized stochastic Petri nets (GSPNs) is established and combined with the power transfer capability via universal generating function (UGF). Though changing flow rate to face the degradation rate of hydraulic pump, the reliability assessment of DHAS based on the proposed reliability model is effective and accurate.
    Układy przesyłu energii (power transfer systems, PTS) charakteryzują się szczególnymi właściwościami niezawodnościowymi, w tym wielostanowością i zależnością między błędami. W związku z tym, tradycyjne metody modelowania niezawodności, które sprawdzają się w przypadku systemów dwustanowych, nie pozwalają na dokładną ocenę niezawodności PTS. W przedstawionej pracy zaproponowano nowatorski model niezawodności systemu wielostanowego, który do oceny niezawodności PTS wykorzystuje dane o wydajności przesyłu energii (PTE). Model ten wiążę niezawodność zarówno z zapotrzebowaniem na energię końcową jak i zdolnością przesyłową PTS. Rozważano model wielostanowy opisujący proces degradacji komponentów systemu w oparciu o PTE. W proponowanym modelu analizowano korelacje między uszkodzeniami w świetle struktury systemu i mechanizmu alokacji energii, a niezawodność oceniano dla różnych stopni zapotrzebowania na energię końcową. Podejście to zweryfikowano na przykładzie podwójnego układu hydrauliki siłowej (DHAS), dla którego ustalono model stochastyczny oparty na uogólnionych stochastycznych sieciach Petriego (GSPN), który łączono ze zdolnością przesyłową za pomocą uniwersalnej funkcji tworzącej (UGF). Badania pompy hydraulicznej prowadzone dla różnych prędkości przepływu i różnych szybkości degradacji wykazały, iż ocena niezawodności DHAS na podstawie proponowanego modelu cechuje się skutecznością i trafnością.
    Źródło:
    Eksploatacja i Niezawodność; 2020, 22, 2; 282-296
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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