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  • The analysis model of the radial bearing based on nonlinear rheological equation of the Maxwell, given the existence of a limiting shear stress

    This paper presents a method of calculating the hydrodynamic radial slide bearing runs on the lubricant that has both viscoplasticity properties. When developing the analysis model as the initial equations the nonlinear Maxwell model with the existence of the limit shear stress. Asymptotic solution of the problem was found in even powers of the parameter due to the presence of limiting shear stress of the lubricant. Found the velocity field and the pressure in the lubricating layer obtained analytical expression for the bearing capacity of the bearing. The estimation of influence of parameters characterizing the elastic properties of the lubricant (the Deborah number) and a dimensionless parameter characterizing the viscoelastic properties of the lubricant parameter (plasticity) on the bearing capacity of the radial bearing.

    Keywords: radial bearing, bearing capacity, ultimate shear stress, the parameter of plasticity, deformation

  • 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