Fluid mechanics in machine construction and exploitation - examples of relations

In the work presented have been fundamental equations of hydrodynamic theory of lubrication (the Reynolds equation and energy equation) as a specific case of classical equations of fluid-mechanics, i.e. Navier-Stokes equations. On such basis conducted has been an attempt to describe the phenomena of hydrodynamic instability in the rotor-bearings system followed by the description of vortices and oil whip. Indicated have been the relations between the theory and equations of fluid mechanics and the practical aspects resulting from the analysis of entire machine with the view to its exploitation and diagnostics.