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Wyszukujesz frazę "hydraulic unit" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
A method of investigating internal leakages in aircraft hydraulic units
Autorzy:
Szczepaniak, P.
Jastrzębski, G.
Jóźko, M.
Powiązania:
https://bibliotekanauki.pl/articles/242288.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aircraft hydraulic unit
internal leakage
precision hydraulic pair
Opis:
Methods of diagnosing technical condition of aircraft hydraulic systems have been analysed. Associated precision pairs of aircraft hydraulic systems have been presented. The most essential features of operating conditions and the loads that affect distributor components of sliding pairs have been identified. The structure of BU intensifier with a sliding distributor has been illustrated. Equation for internal leakages for a precision hydraulic pair with a concentric annular gap (clearance) has been presented. Illustrated and discussed are instances of examining internal leakages occurring in hydraulic systems (with direct methods applied). Findings of research into these issues have been presented as based on measurements taken on the hydraulic system of the Su-22 operated by the Air Force of the Republic of Poland. The technique of examining the problem consists in taking and recording measurements of the drop in pressure in the hydraulic system. The relationship between time of pressure-drop and total leakage for hydraulic systems of particular Su-22 aircraft has been illustrated. The results of research direct and indirect methods have been presented and analysed. Both methods have been compared from the aspect of assessing technical condition of the aircraft hydraulic system. Potential factors that could affect measurements with a given method have been identified.
Źródło:
Journal of KONES; 2014, 21, 4; 471-478
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discharge measurement and performance tests of hydraulic units in low-head small hydropower installations
Autorzy:
Steller, J.
Adamkowski, A.
Henke, A.
Janicki, W.
Kaniecki, M.
Krzemianowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/175552.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydropower
hydraulic unit
performance test
discharge measurement
current meter method
pressure-time method
Opis:
In course of over half a century the test teams of the Szewalski Institute of Fluid-Flow Machinery (IMP PAN) have conducted numerous performance tests of small hydropower (SHP) installations on various occasions and motivations, including updating or establishing performance characteristics of old machines, acceptance of new units, checking or optimising the cam correlation of new or refurbished double-regulated turbines, checking performance of prototype turbines under field conditions. The discharge measurement techniques have included currentmeter, pressure-time and acoustic methods. Index tests, using the Winter-Kennedy and other differential pressure methods, as well as current-meter and acoustic techniques, have been employed quite frequently to optimise the cam curves of double-regulated machines. In one case a simplified technique based solely on the power/wicket gate opening relationship was checked. This paper discusses some techniques applied when determining the absolute efficiency and optimizing cam correlations by means of absolute and index test methods. Cubic spline formulae as applied to integrate the flow velocity field in a hydrometric section are derived. Results of a discharge measurement by means of the current-meter and pressure-time method are compared as a special case study. Finally, practical recommendations addressed both to the power plant owners and the test team members are formulated.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 130; 3-29
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of pumping units equipped with oscillating hydraulic pressure intensifiers for displacement of cylinders with heavy loads over the entire stroke
Autorzy:
Popescu, Teodor-Costinel
Chiriță, Alexandru Polifron
Popescu, Ana-Maria Carla
Popescu, Alina-Iolanda
Powiązania:
https://bibliotekanauki.pl/articles/27324338.pdf
Data publikacji:
2022
Wydawca:
Instytut Techniki Górniczej KOMAG
Tematy:
low-pressure pumping unit
oscillating hydraulic pressure intensifier
high pressure
hydraulic cylinder
Opis:
Working and moving in confined, limited and narrow spaces, specific to underground mining activities, also requires the use of hydraulically operated equipment, capable of developing large forces, with small dimensions. An example of such equipment includes pumping units comprising low-pressure electric pumps and oscillating hydraulic pressure intensifiers. They use low pressure in the primary side of the intensifier and generate high pressure in the secondary side of the intensifier. Such pumping units are usually used to achieve and maintain high pressure, either in the volumes of closed spaces (in strength tests on pipes and tanks) or at the end of the active stroke of hydraulic cylinders (in hydraulic presses). On an experimental laboratory bench, which comprises a test cylinder, powered by a pumping unit, equipped with an oscillating hydraulic pressure intensifier, and a load cylinder, powered by another pumping unit, with the possibility of load control, the authors show that: the application range of these pumping units can be extended in the third direction, too, useful for underground mining activities, namely for drive of hydraulic cylinders with low gauge / displacement speeds and constant high load (high working pressure) over the entire working stroke length; the uniformity of displacement of these cylinders, with load throughout the stroke length, which are powered and driven with such pumping units, is slightly affected by the pulsating mode of operation of the hydraulic pressure intensifier. A set of experimental measurement results is presented for a constant value of the load over the entire displacement stroke of the test cylinder.
Źródło:
Mining Machines; 2022, 40, 4; 238--248
2719-3306
Pojawia się w:
Mining Machines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of control system of hydraulic press based on Zelio Logic controller
Razrabotka sistemy upravlenija gidravlicheckim processom na osnove kontrollera Zelio Logic
Autorzy:
Verkhovodov, O.
Karpuyk, O.
Powiązania:
https://bibliotekanauki.pl/articles/793368.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
control system
Zelio Logic model
hydraulic press
technological operation
algorithm
microprocessor control unit
microprocessor control system
software
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 4
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydraulic rescue equipment for firefighters
Hydrauliczne wyposażenie ratunkowe dla straży pożarnych
Autorzy:
Meteňko, J.
Marcinek, M.
Powiązania:
https://bibliotekanauki.pl/articles/952226.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
hydraulic extrication tool
hydraulic spreader/expander
hydraulic cutter
hydraulic elevating ram jacks
power unit
emergency situation
material equipage
technical equipage
narzędzie do wyciągania hydraulicznego
rozsiewacz hydrauliczny
ekspander
przecinak hydrauliczny
podnośnik hydrauliczny
jednostka napędowa
sytuacja awaryjna
materiał techniczny
wyposażenie techniczne
Opis:
Authors deal with the topic relating to use of hydraulic extrication tools while technical interventions. They characterize the individual technical items used during extrication. They characterize material and technical equipment of rescue units emphasizing the need of systematic approach to any emergency situation relating to extrication of persons.
Autor zajmuje się zastosowaniem narzędzi do wyciągania hydraulicznego w interwencjach technicznych w zakresie ratowania osób i bliżej charakteryzuje poszczególne elementy techniczne wykorzystywanych urządzeń ratowniczych. Charakteryzuje wyposażenie techniczne odpowiednich jednostek i podkreśla potrzebę systematycznego rozwiązywania każdej nadzwyczajnej sytuacji awaryjnej związanej z wydobywaniem osób.
Źródło:
Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa; 2018, T. 6; 821-834
2300-5343
Pojawia się w:
Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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