FUNDAMENTALS OF THE STOCHASTIC DESCRIPTION OF THE HYDRODYNAMIC THEORY OF LUBRICATION
Journal Title: Tribologia - Year 2012, Vol 245, Issue 5
Abstract
The aim of this paper is the presentation of basic principles referring to the application of stochastic methods during the solution of hydrodynamic lubrication problems for slide journal bearings, taking into account the standard deviation and expectancy values of gap height between two cooperating surfaces. A description of real gap height changes in microand bio-bearings depend on the variations of cooperating surfaces. Random changes of the surface are described by the probability density functions based on a comparison between results of the J. Cwanek and K. Wierzcholski’s experiments and the investigations of D. Dowson and Mow. Such experiments are performed for micro-bearing surface samples as well cartilage surface samples obtained from human bio-joints. The random influence of the surface roughness on the change of the flow and operational parameters is indicated by many experiments. The presented methods based on values of probability density function obtained in experimental way enable one to formulate basic hydrodynamic dependencies for lubrication theory in random description.
Authors and Affiliations
Krzysztof Wierzcholski, Andrzej Miszczak
Keywords
Related Articles
- EP ID EP270409
- DOI -
- Views 36
- Downloads 0
THE INFLUENCE OF THE SHAPE OF RACES FOR THE BALL BEARINGS ON THE LIFE OF BEARINGS
The bearings of the three bearing shaft are usually regarded as ideally stiff articulated supports. In technical literature, the shaft elasticity is the only factor taken into account when determining the reaction and be...
MEASUREMENT OF THE STATIC FRICTION COEFFICIENT BETWEEN A poly-V belt 5pk AND A PULLEY UNDER DRY CONDITIONS
The paper presents the results of experimental measurements of static friction forces between a poly-V belt 5pk and a pulley on a specialised research stand. An average effective static coefficient is assumed depending o...
THE ASSESSMENT OF TRIBOLOGICAL PROPERTIES IN ROLLING-SLIDING CONTACT IN RECIPROCATING MOTION ON A DEVICE FOR SURFACE WEAR TESTING
The paper presents wear tests of a sample made of rail steel in a reciprocating motion on an experimental apparatus for surface wear testing. Professional machines for wear tests of rolling-sliding contact, whose main ta...
Badanie właściwości tribologicznych warstw wierzchnich modyfikowanych nanofazowymi materiałami proszkowymi
BADANIA EKSPERYMENTALNE STRUKTURALNEJ WARSTWY NOŚNEJ ŁOŻYSKA FOLIOWEGO Z POWŁOKĄ POLIMEROWĄ W ZAKRESIE OBCIĄŻEŃ STATYCZNYCH
Gazowe łożyska foliowe mogą być stosowane przy bardzo wysokich prędkościach obrotowych oraz w wysokich temperaturach. Praca w takich warunkach wymaga jednak odpowiedniej konstrukcji łożyska oraz zaawansowanych rozwiązań...