Temat: fluid-flow system - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Research on high-pressure hose with repairing fitting and influence on energy parameter of the hydraulic drive
Autorzy:: Karpenko, Mykola
Prentkovskis, Olegas
Šukevičius, Šarūnas
Powiązania:: https://bibliotekanauki.pl/articles/2057977.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: high-pressure hose
fitting
maintenance
energy
pipeline
fluid flow
numerical modeling
hydraulic system
CFD
Opis:: Reliability and maintenance analysis of transport machines hydraulic drives, basically focused to power units: pumps, cylinders etc., without taking in to account junction elements. Therefore, this paper proposes a research analysis on high-pressure hoses and junctions during technical maintenance. Comparative analysis of fluid behavior and energy efficiency inside non-repaired and repaired high-pressure hoses is presented in this research. Theoretical and experimental research results for hydraulic processes inside high-pressure hose is based on the numerical simulations using Navier–Stokes equations and experimental measurement of fluid flow pressure inside high-pressure hoses. Research of fluid flow dynamics in the hydraulic system was made with main assumptions: system flow rate in the range from 5 to 100 l/min, diameter of the hoses and repairing fitting are 3/8". The pressure drops, power losses, flow coefficients at non-repaired and after maintenance hose was obtained as a result. Simulation results were verified by running physical experiments to measure the pressure losses.
Źródło:: Eksploatacja i Niezawodność; 2022, 24, 1; 25--32
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Model testing of the internal leaks of valve body in automatic transmission
Autorzy:: Dziubak, T.
Szczepaniak, P.
Powiązania:: https://bibliotekanauki.pl/articles/246026.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: automatic transmission
hydraulic system
hydraulic precise pair
wear of hydraulic couplings
internal leaks
ATF fluid flow rate model
Opis:: The article presents the working conditions and the functions of the ATF fluid in an automatic transmission. It was noted that the correct operation of the automatic transmission is heavily influenced by the quality of the ATF fluid, which operates in disadvantageous conditions of oxidising environment, is subject to contamination and undergoes intense shearing, thus changing its physical and chemical properties during use. The analysis included the disadvantageous, from the point of view of loss of fluid pressure in the automatic transmission’s hydraulic system, phenomenon of the fluid’s flow through fractures (clearances) of the hydraulic precise pairs “called the rate of flow through internal leaks” or an “internal leak”. The model of the rate of flow through internal leaks was proposed to determine the impact of the precise pairs’ wear and the hydraulic fluid’s properties on the aggregated leaks in the hydraulic system controller of the automatic transmission. The modelling utilised the dependency between the rate of flow through internal leaks of the hydraulic precise pair and the coaxial circular fracture. The model’s assumptions were formulated. The values of clearances of the electrohydraulic controller’s precise pairs were determined during the measurements of the actual structure – based on the automatic transmission’s mileage. The measurements featured relevant diameters of pushers and sliders, as well as internal diameters of cylindrical openings of manifold sliders and hydraulic suppressors. Variant model testing was conducted with various degrees of the fluid’s wear and temperature (viscosity and density) for conditions of driving with transmission “1” and “2”.
Źródło:: Journal of KONES; 2017, 24, 3; 71-78
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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