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1
Content available Inertia effects in a multilobe conical bearing lubricated with a couple stress fluid
Walicka A., Walicki E., Jurczak P.
International Journal of Applied Mechanics and Engineering
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2019
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Vol. 24, no. 2
439--451
EN
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.
2
Content available Mechanical parameters of the curvilinear squeeze film bearing lubricated by a Gecim-Winer fluid
Walicka A., Walicki E.
International Journal of Applied Mechanics and Engineering
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2017
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Vol. 22, no. 2
465--473
EN
Based upon a Gecim-Winer fluid flow model, a curvilinear squeeze film bearing is considered. The equations of motion are given in a specific coordinates system. After general considerations on the Gecim-Winer fluid flow these equations are used to derive the Reynolds equation. The solution of this equation is obtained by a method of successive approximation. As a result one obtains formulae expressing the pressure distribution and load-carrying capacity. The numerical examples of the Gecim-Winer fluid flow in gaps of two simple bearings: radial and spherical are presented.
3
Content available Influence of total inertia effects in a thrust curvilinear bearing lubricated with Newtonian lubricants
Walicka A., Jurczak P.
International Journal of Applied Mechanics and Engineering
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2017
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Vol. 22, no. 4
1045--1058
EN
In the paper, the flow of a Newtonian type of lubricant in the clearance of a curvilinear bearing is considered. It is assumed that the bearing walls are modelled as smooth and impermeable. In analytical considerations, full inertia of the longitudinal flow and partial inertia of the circumferential flow are taken into account. The equation of motion of the lubricant is solved by the modified method of averaged inertia. A thrust bearing and spherical bearing are considered, for which dimensionless pressure distributions and the bearing capacity are given.
4
Content available Curvilinear squeeze film bearing lubricated with a DeHaven fluid or with similar fluids
Walicka A., Jurczak P., Falicki J.
International Journal of Applied Mechanics and Engineering
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2017
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Vol. 22, no. 3
697--715
EN
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.
5
Content available Pressure distribution in a squeeze film spherical bearing with rough surfaces lubricated by an ellis fluid
Jurczak P., Falicki J.
International Journal of Applied Mechanics and Engineering
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2016
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Vol. 21, no. 3
593--610
EN
In this paper, the solution to a problem of pressure distribution in a curvilinear squeeze film spherical bearing is considered. The equations of motion of an Ellis pseudo-plastic fluid are presented. Using Christensen’s stochastic model of rough surfaces, different forms of Reynolds equation for various types of surface roughness pattern are obtained. The analytical solutions of these equations for the cases of externally pressurized bearing and squeeze film bearing are presented. Analytical solutions for the film pressure are found for the longitudinal and circumferential roughness patterns. As a result the formulae expressing pressure distribution in the clearance of bearing lubricated by an Ellis fluid was obtained. The numerical considerations for a spherical bearing are given in detail.
6
Content available Mechanical parameters of the squeeze film curvilinear bearing lubricated with a Prandtl fluid
Walicka A., Walicki E.
International Journal of Applied Mechanics and Engineering
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2016
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Vol. 21, no. 4
967--978
EN
Based upon a Prandtl fluid flow model, a curvilinear squeeze film bearing is considered. The equations of motion are given in a specific coordinate system. After general considerations on the Prandtl fluid flow these equations are used to derive the Reynolds equation. The solution of this equation is obtained by a method of successive approximation. As a result one obtains formulae expressing the pressure distribution and load-carrying capacity. The numerical examples of the Prandtl fluid flow in gaps of two simple bearings are presented.
7
Content available remote Mechanical Parameters for a Multilobe Conical Bearing Lubricated with a Couple-Stress Fluid
Walicka A., Walicki E., Jurczak P., Wojnarowski J.
Machine Dynamics Research
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2015
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Vol. 39, No. 4
43-54
EN
In this paper a solution to the problem of mechanical parameters of a multilobe journal bearing is presented. The problem is solved by the Galerkin method after assuming that the bearing is lubricated with a couple-stress fluid. An example of a two-lobe bearing is discussed in detail. It was found that the presence of couple-stresses affects considerably an increase in the film pressure.
8
Content available remote Static and dynamic characteristics of journal bearings with non-newtonian palm-based oils
Mongkolwongrojn M., Aiumpornsin Ch.
International Journal of Applied Mechanics and Engineering
|
2003
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Vol. 8, no spec.
79-86
EN
This paper presents the investigation of the static and dynamic characteristics of hydrodynamic journal bearings lubricated with non-newtonian palm-based oils. The palm oil was mixed with 0.2% ZDTP and 1% ZDTP to reduce oxidation and increase lubricity. In this study, the power law model is proposed as a rheology model of palm-based oil and the relationship between the shear stress and shear rate was obtained experimentally. The time-dependent modified Reynolds equation, and adiabatic energy equation were formulated for full circular bearings. Finite difference method was used to calculate both the static and dynamic characteristics of the bearings such as pressure distribution, temperature distribution, attitude angle, stiffness and damping coefficients. The results shows that the palm-based oils have potential to use as a biodegradable lubricant.
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