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    Wyświetlanie 1-7 z 7
    Tytuł:
    Inertia and couple-stress effects in a curvilinear thrust hydrostatic bearing
    Autorzy:
    Walicka, A.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/266178.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    couple-stress lubricant
    inertia effects
    hydrostatic thrust bearing
    efekt bezwładności
    łożysko oporowe
    smar
    Opis:
    The flow of a couple-stress lubricant in a clearance of a curvilinear thrust hydrostatic bearing with impermeable walls is considered. The flow in the bearing clearance is considered with inertia forces. The equations of motion are solved by an averaged inertia method. As a result, the formulae for pressure distributions without and with inertia effects were obtained. Radial thrust bearings and spherical bearings are discussed as numerical examples. It is shown that inertia effects influence the bearing performance considerably.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 759-767
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thrust bearing with rough surfaces lubricated by an Ellis fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/955249.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    płyn pseudoplastyczny
    model Ellisa
    łożysko oporowe
    chropowatość
    pseudo-plastic fluid
    Ellis model
    thrust bearing
    Christensen roughness
    Opis:
    In the paper the influence of bearing surfaces roughness on the pressure distribution and load-carrying capacity of a thrust bearing is discussed. The equations of motion of an Ellis pseudo-plastic fluid are used to derive the Reynolds equation. After general considerations on the flow in a bearing clearance and using the Christensen theory of hydrodynamic rough lubrication the modified Reynolds equation is obtained. The analytical solutions of this equation for the cases of a squeeze film bearing and an externally pressurized bearing are presented. As a result one obtains the formulae expressing pressure distribution and load-carrying capacity. A thrust radial bearing is considered as a numerical example.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 4; 809-822
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Curvilinear squeeze film bearing lubricated with a DeHaven fluid or with similar fluids
    Autorzy:
    Walicka, A.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264447.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    DeHaven fluid
    modified Reynolds equation
    squeeze film
    mechanical parameters of the bearing
    łożysko
    równanie Reynoldsa
    płyn nienewtonowski
    Opis:
    In the paper, the model of a DeHaven fluid and some other models of non-Newtonian fluids, in which the shear strain rates are known functions of the powers of shear stresses, are considered. It was demonstrated that these models for small values of material constants can be presented in a form similar to the form of a DeHaven fluid. This common form, called a unified model of the DeHaven fluid, was used to consider a curvilinear squeeze film bearing. The equations of motion of the unified model, given in a specific coordinate system are used to derive the Reynolds equation. The solution to the Reynolds equation is obtained by a method of successive approximations. As a result one obtains formulae expressing the pressure distribution and load-carrying capacity. The numerical examples of flows of the unified DeHaven fluid in gaps of two simple squeeze film bearings are presented.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 697-715
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porous squeeze film bearing with rough surfaces lubricated by a Bingham fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/955251.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    płyn lepkosprężysty
    model Binghama
    łożysko oporowe
    warstwa porowata
    viscoplastic fluid
    Bingham model
    thrust bearing
    porous layer
    Christensen roughness
    Opis:
    In the paper the effect of both bearing surfaces and the porosity of one bearing surface on the pressure distribution and load-carrying capacity of a squeeze film bearing is discussed. The equations of motion of a Bingham fluid in a bearing clearance and in a porous layer are presented. Using the Morgan-Cameron approximation and Christensen theory of rough lubrication the modified Reynolds equation is obtained. The analytical solutions of this equation for a squeeze film bearing are presented. As a result one obtains the formulae expressing pressure distribution and load-carrying capacity. A thrust radial bearing is considered as a numerical example.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 4; 795-808
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Curvilinear squeeze film bearing with porous wall lubricated by a Rabinowitsch fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/266104.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    non-Newtonian fluid
    Rabinowitsch model
    curvilinear squeeze film bearing
    porous layer
    płyn nieniutonowski
    model Rabinowitscha
    łożysko ślizgowe
    warstwa porowata
    Opis:
    The present theoretical analysis is to investigate the effect of non-Newtonian lubricant modelled by a Rabinowitsch fluid on the performance of a curvilinear squeeze film bearing with one porous wall. The equations of motion of a Rabinowitsch fluid are used to derive the Reynolds equation. After general considerations on the flow in a bearing clearance and in a porous layer using the Morgan-Cameron approximation the modified Reynolds equation is obtained. The analytical solution of this equation for the case of a squeeze film bearing is presented. As a result one obtains the formulae expressing pressure distribution and load-carrying capacity. Thrust radial bearing and spherical bearing with a squeeze film are considered as numerical examples.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 427-441
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inertia effects in a multilobe conical bearing lubricated with a couple stress fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Jurczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/265020.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    efekt bezwładności
    równanie Reynoldsa
    metoda Galerkina
    łożysko
    inertia effects
    modified Reynolds equation
    Galerkin method
    mechanical parameters of bearing
    additives
    Opis:
    In this paper, a multilobe conical bearing is analyzed. A lubricant modelled by a couple stress fluid flows In the bearing clearance . The Galerkin method is used to determine the mechanical parameters of multilobe journal bearings. An example of a two-lobe conical bearing is discussed in detail. The inertia of the flowing lubricant is taken into account in the analysis. It has been found that the increase of the couple stress generates an increase the pressure in the clearance.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 439-451
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of wall porosity and surfaces roughness on the steady performance of an externally pressurized hydrostatic conical bearing lubricated by a Rabinowitsch fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264399.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pseudo-plastic fluid
    Rabinowitsch model
    curvilinear and conical thrust bearings
    porous layer
    Christensen roughness
    łożysko oporowe
    warstwa porowata
    model Rabinowitscha
    Opis:
    In the paper, the influence of both the bearing surfaces roughness as well as porosity of one bearing surface on the pressure distribution and load-carrying capacity of a curvilinear, externally pressurized, thrust bearing is discussed. The equations of motion of a pseudo-plastic Rabinowitsch fluid are used to derive the Reynolds equation. After general considerations on the flow in a bearing clearance and in a porous layer using the Morgan-Cameron approximation and Christensen theory of hydrodynamic lubrication with rough bearing surfaces the modified Reynolds equation is obtained. The analytical solution is presented; as a result one obtains the formulae expressing the pressure distribution and load-carrying capacity. Thrust radial and conical bearings, externally pressurized, are considered as numerical examples.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 717-737
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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