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• ## Development of a new mathematical method for modeling a modified design of a radial sliding bearing

The article is devoted to the development of a new mathematical method for modeling radial plain bearings having a polymer coating with an axial groove on the bearing surface. For the calculation evaluation of technical solutions for wear resistance, the compressibility of a truly viscous lubricant under laminar flow conditions is taken into account. As a result, new mathematical models were obtained that make it possible to estimate the duration of the hydrodynamic flow regime of the lubricant, to prove the stability and possibility of changing lubrication modes from boundary to hydrodynamic, as well as to make a calculated assessment of the effect of compressibility of the lubricant and wear resistance on operational characteristics.

Keywords: modeling, mathematical method development, modified design, compressibility impact assessment

• ## Design model of a radial bearing with a two-layered porous coating on the surface of a shaft operating on an electrically conductive lubricant

In the paper, based on the linear equations of motion of an electrically conductive liquid lubricant for the case of a "thin layer", the continuity equation and Darcy, the exact self-similar solution of the problem of hydrodynamic calculation of a radial bearing with an electrically conductive lubricant is given. A field of velocities and pressures in the lubricating and porous layers was found in the work, in the following, analytical dependences were obtained for the main operating characteristics of a bearing with a two-layer porous coating on the shaft surface. An estimate is also given of the effect of the electrically conductive properties of the lubricant, the presence of a porous layer on the main operating characteristics of the bearing.

Keywords: Electroconductive liquid lubricant, radial bearing, permeability of porous layers, electromagnetic field

• ## Stratified layers of lubricant with different physical and mechanical properties

It is known that the presence of particles in the lubricating fluid additive or wear products, and also due to its molecular orientation of the wall near the solid support surface bearing lubrication is separation into layers of different viscosities. Laminar flow of a viscous incompressible fluid in the gap of the thrust and radial bearings considered in [1-16]. A significant drawback of the proposed methodology here is that the computational model is ignored pressure dependence of viscosity. For large values of the pressure in the lubricating layer of lubricant viscosity increases significantly, and there is a need to address the dependence of viscosity on pressure.

Keywords: double-layer lubrication, maintenance force adapted profile, stratified flow, pressure dependence of viscosity, viscoplastic grease

• ## Stratification of the lubricant in radial slide bearing

In the presence of liquid lubricant particles precipitate from wear products or additives, as well as from the wall of the adsorption and chemisorption on metal surfaces contacting bearing surfaces separation occurs at the layers of lubricants with different viscosity properties. For viscous incompressible stratified lubricant in the gap thrust and radial bearings seen in the works. A significant drawback of these studies is that the calculation model is ignored pressure dependence of viscosity. For large values of the pressure in the lubricating layer of lubricant viscosity increases significantly, and there is the need to address the dependence of viscosity on pressure.

Keywords: double-layer lubrication, maintenance force adapted profile, stratified flow, demfiruyuschie properties, pressure dependence of viscosity.

• ## Stratification of the lubricant in the thrust bearings

In this paper, based on a system of equations of motion of a viscous incompressible fluid with the viscosity depending on the pressure, and continuity equations, provides self-similar solution using the current functions of the stratified flow of lubricant in the thrust bearings. The proposed model is calculated in contrast with the existing three-layer stratification, further complicated by the dependence of the viscosity of the lubricant pressure. An analytical expression allows to obtain a description of three-layer stratified fluid lubricants and a graph of the effect of structural parameter and viscosity ratio stratified layers on the basic performance of the bearing. Numerical analysis of the dependence of the parameters of the adapted profile and load-carrying capacity of lubricating layers.

Keywords: three-layer lubrication, maintenance power circuit adapted slider, stratified flow, pressure dependence of viscosity.

• ## The computational model of radial plain bearing with increased load capacity, working on micropolar lubricantgiven its viscosity characteristics of the pressure

As is known, currently in a model gidrodinaimcheskoy sliding bearing lubricant widely used micropolar lubrication. A major shortcoming of existing working models of bearings running on micropolar lubricant is that this does not take into account the dependence of viscosity characteristics of the micropolar lubricant on the pressure. Naturally, there is a need not only into account the dependence of viscosity characteristics of the pressure in the development of an analytical method for predicting the optimal carrying capacity characteristics inherent MICROPOLAR grease, but also predict the optimal profile of the reference surface of the radial bearing. [1-3 ]Solving this problem is devoted to this work.

Keywords: porous bearing, friction regime, the permeability of the porous layer, the viscoelastic lubricant.

• ## The computational model thrust bearing with high load-bearing capacity, working on non-Newtonian lubricants with tailored support surface

The ability to choose the right anti-wear additives [1-6 ] allows you to create lubricants , which are thin layers have different properties than in large volumes. It is commonly assumed that the additives are functioning only in the zone boundary lubrication and are outside the scope of the hydrodynamic theory of lubrication . However, the beneficial effect of additives as indicated in many studies [1-5 ] we have in the " thin layer" of hydrodynamic lubrication .As is well known , lubrication bearings operate on different types of lubricants which are composed of base oil and additive compositions that provide the required functional properties of the oil . Additives polymers with high molecular weight oils impart viscoelastic properties . Analysis of existing studies [ 7-9] on the calculation of bearings running on a viscoelastic lubricant , shows that they do not take into account the dependence of the viscosity and shear modulus of the pressure and temperature, and mode of friction is assumed laminar. It is known [ 10 ] , high-speed bearings operating in turbulent friction , higher pressure and higher temperature, and so the development of methods for calculating the bearings running on a viscoelastic lubricant requires consideration of the above factors.In connection with the above written shall first develop the computational model of thrust bearings running on micropolar lubricant with the viscosity characteristics of the lubricant on the pressure in contrast to the existing theoretical models do not take into account these dependencies (task 1).And then consider the calculation model of extra load -bearing capacity , working on a viscoelastic lubricant for the dependence of its characteristics on the pressure (objective 2).

Keywords: thrust bearing with the abutment surface adapted, non-Newtonian lubricants