To facilitate fundamental study of the surface texturing effect on hydrodynamic lubrication, analytical and experimental tools are required. While there is an extensive amount of theoretical and analytical analyses in the literature, relevant experimental studies are much rarer. A detailed study requires techniques by which one can (a) produce micron-sized textures on a millimeter-scale area on...

CFCs, HCFCs are stipulated to phase out, and other alternative refrigerants like R134a, are also constrained as a result from their high GWP values. CO2 as a natural working fluid now is used in reciprocating compressors due to its uniquely beneficial properties (ozone depletion potential, ODP=0; global warming potential, GWP =1). However, one remarkable characteristics of the CO2 reciprocating...

This article presents an experimental study carried out on a rotor operating two foil bearings. One of the bearings was built in way to measure temperature and deformation top bearing. The dynamic performance bearing journals is presented herein using vibration trajectories journal positions sleeve. Based these results, method for predicting distribution developed. Then, correlations between pa...

This work revealed the results of comparative surveys of the impact of formed surface layer TiN and CrN and two component surfaces layer TiN-steel and CrN-steel. The slide couple worked in conditions of lubricating the friction area with Lotos Syntetyk 5W/40 and Castrol GTX Magnatec 5W/40 engine oils. In the friction couple the counter sample was made from CuPb30 bearing alloy. The tribological...

Compliant foil gas lubricated bearings are used for the support of light loads in the order of few kilograms at high speeds, in the order of 50,000 RPM. The stiffness of the foil bearings depends both on the stiffness of the compliant foil and on the lubricating gas film. The stiffness of the bearings plays a crucial role in the stable operation of the supported rotor over a range of speeds. Th...