In this paper, based on the Navier-Stokes equations , the continuity equation , taking into account the pressure dependence of viscosity , Darcy equation taking into account the dependence of the permeability of the porous layer of the pressure given by the exact method of forming a self-similar solution of the problem of calculating the hydrodynamic journal bearing operating at three-layer lubricant . As a result, found the velocity field and the pressure in the lubricating layer and the analytical expressions for the components of the supporting forces and friction. Found rational bearing capacity values ​​characterizing different aspects of the functioning of the knot of friction , namely profile support surface ; special lubricating fluid interaction with the surfaces of the friction unit , taking into account the pressure dependence of viscosity ( the formation of intermediate layers with different lubricant viscosities ) .

Keywords: three-layer lubrication, maintenance force adapted profile stratified flow.

In this paper, based on Darcy equations that govern the lubricant in porous layers , and the modified Reynolds equation in the framework of a short bearing solve the problem of unsteady motion of a viscous incompressible lubricant in the bearing clearance double-layer porous . Here we consider the case when the permeability in porous layers in the axial direction is changed by the normal law , and the combined feed lubrication is performed simultaneously in the axial and perpendicular to the bearing axis directions. As a result, the pressure field found in porous layers and in the lubricating layer and analytical dependences for the efforts of the oil film . Compiled by the equation of motion tongue and solved the problem of the stability of the unsteady motion of a pin bearing , found that in the case of a combined bearing lubrication working more steadily compared with the cases or axial directions perpendicular to the axis lubrication . The results obtained can be offered for the development of cylindrical dampers with double-layer porous collar , effectively attenuating transmitted force imbalance in the combined feed lubrication.

Keywords: two-layer porous plug; permeability porous layers, load capacity; equation of motion of the stud; stability

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 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

To investigate the stability of the porous bearings developed computational model heterogeneous porous bearing of finite length. Given the permeability anisotropy of the porous layer in the paper the problem of stability of motion of a pin in the bearing for the two different versions of lubrication: the axial direction and in the direction perpendicular to the axis of the bearing. Obtained and analyzed the tasks identified areas of stability of motion spine.

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

In article the description of models of adaptive management outlining the content electronic courses. Model based on the analysis of factor run content element and the factor of time interacting with the content element CEMA (classifiers events - management analyzer) for calculating an objective indicator of course studying result of user to send a learning management system (LMS). A model of the DCG (dynamic content generation) to localize errors in the develop electronic courses and to the human factor in learning process. Proposed criteria and shown one model implementation AMLM (adaptive management e-learning materials). Results of the study found use in educational institutions and commercial enterprises involved in the introduction of new technologies and improve efficiency in e-learning. Organizations interested in the development of services provided by e-learning and stimulating economic benefits will find helpful many aspects of this work for planning strategies for education and training of personnel companies-customers, students and the public. 

Keywords: education, e-learning, Learning Management System, electronic learning course, models of adaptive management outlining of content

Information about authors of issue №1 (2007)

Keywords: authors