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    Wyświetlanie 1-4 z 4
    Tytuł:
    Durability tests of ball valve prototype with flowmeter operation
    Autorzy:
    Rogula, J.
    Romanik, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/266190.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    tarcie
    prototyp
    zawór kulowy
    friction
    leakage
    ball valve
    prototype
    Opis:
    The results of the investigation of the prototypical ball valve are presented in this article. The innovation of the tested valve is a ball with a built-in measuring orifice. The valve has been subjected to durability tests. Leakage under three temperatures: ambient, -30°C and +100°C was analyzed. Sealing elements of the valve were tested for roughness and deviation of shape before and after the cycles of operation. Ball valve operation means cycles of open/close. It was planned to perform 1000 cycles at each temperature condition accordingly. Tests of the valve were performed under gas pressure equal to 10 MPa. The research was carried out under the Operational Program “Intelligent Development” (POIR 01.01.01-00-0013 / 15 “Development of devices for measurement of media flow on industrial trunk-lines”.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 1; 235-249
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The grooved lip effect on reciprocating hydraulic rod seal performances in transient condition: elastohydrodynamic lubrication
    Autorzy:
    Bahi, Y.
    El Gadari, M.
    Rahmoune, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/264834.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    chropowatość
    siła tarcia
    wyciek
    hydraulic rod seal
    surface textured
    roughness
    friction force
    leakage
    Opis:
    It is commonly known that the sealing performance of dynamic seals is significantly influenced by the surface finish. To reduce friction effect and leakage ratio, new generations of grooved lip or shaft have emerged, but only two computational models were performed up to now with a textured elastomeric lip: spiral groove in the axial direction or micro-cavities according to the circumferential direction. However, if the numerical results have confirmed the slight effect of the grooved lip on the rotary lip seal performances, it seems relevant to investigate the influence of such grooves on the reciprocating hydraulic rod seal behavior. Thus, the scope of this work is to perform a parametric study of the grooved lip throughout a one-dimensional elastohydrodynamic model by taking into account the elasticity of the lip and the shaft roughness. After confirming the validity of the current model, numerical simulations have been performed and compared with experiments. The effect of lip grooves on the hydraulic rod seal behavior in outstroke and instroke shaft motion has been underlined. Thereby, it is shown that the leakage and the average film thickness are sensible to both the depth and the density of the lip groove. Additionally, a slight effect of the pattern shape is observed on the friction force.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 11-21
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Roughness effects of textured surfaces in hydrodynamic lubrication
    Autorzy:
    Bahi, Youssef
    El Gadari, Mhammed
    Rahmoune, Miloud
    Powiązania:
    https://bibliotekanauki.pl/articles/2174176.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    tekstura
    chropowatość
    tarcie
    ciśnienie
    finite difference
    texture
    roughness
    HD pressure
    lifting force
    friction
    leakage
    Opis:
    Several studies have been conducted to improve and model the lubricated contact between surfaces. The main subjects were defining the hydrodynamic parameters to reduce energy losses and protect the environment. Some of the proposed models have studied the effect of textures in hydrodynamic lubrication and have proved that adapted shapes and geometries can improve the performance of lubricated contacts. A hydrodynamic model was developed by assuming the roughness of the textured surface and considering the cavitation in a steady-state regime. The proposed model was validated and compared with the analytical model of Fowell et al. [1]. Three different textures shapes were considered. The results showed that the rough-textured thrust affects the hydrodynamic performance significantly. Thus, by increasing the arithmetic roughness of textured surfaces, the hydrodynamic pressure, and the lifting force increase depending on the texture shape. A rougher surface slightly increases the friction force for the three considered textures.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 9--21
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The application of Boolean algebra in modelling of leakage condition of a car hydraulic braking system
    Autorzy:
    Idzikowski, A.
    Salamon, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/265849.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    układ hamulcowy
    układ hydrauliczny
    wyciek
    algebra Boole'a
    modelowanie
    braking system
    hydraulic circuit
    leakage
    Boolean algebra
    modelling
    Opis:
    A general characteristics of a car hydraulic braking system (CHBS) is presented in this publication. A graphical model of properties-component objects is developed for the above-mentioned system. Moreover, four mathematical models in terms of logic, the set theory and the Boolean algebra of Boolean functions are developed. The examination is ended with a general model of the CHBS for n - Boolean variables and the construction and mathematical-technical interpretation of this model is presented.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 353-363
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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