Modeling of hydrodynamic plain bearings taking into account the individual anti-wear properties of lubricants

The problem of forecasting and ensuring the technical resource of machines is becoming more and more urgent due to the increase in the load of modern machines. Plain bearings are one of the most common friction units in machines and mechanisms. Lubricants play a major role in the wear process of plain bearings. Modern lubricants contain various additives that improve their properties, in particular antiwear additives. A large number of works by domestic and foreign researchers are devoted to the study and modeling of the operation of plain bearings. The least studied are the issues of boundary friction and lubrication. So far, no correct engineering methods have been developed for calculating machine parts, including sliding bearings operating with boundary lubrication. The design parameters of plain bearings of machines and mechanisms are selected at the early stages of design, where it is especially important to use models that reflect the most important physical phenomena and processes that affect the reliability of the machine as a whole. This article describes a methodology for modeling hydrodynamic plain bearings, taking into account the individual antiwear properties of lubricants. The construction of an adequate mathematical model of the boundary layer of a lubricant is carried out on the basis of ideas about the laws of polymolecular adsorption of hydrocarbon liquids containing surfactants of a certain structure. The authors proposed a hypothesis that each of the boundary layers of the lubricant adsorbed on the friction surface consists of two regions having a conditional boundary between them. The model reflects the processes of destruction of the adsorption boundary layer of the lubricant. Test calculations are performed for a statically loaded plain bearing using the proposed model. Further research is aimed at the experimental determination of the parameters of the model of the boundary layer.