The developed numerical method for solving the isothermal compressible Reynolds equation, which governs the equation of air-bearing analysis, is presented in this study. By using the assumption of mass flow continuity between the bearing clearance and orifices, the non-linear Reynolds equation is derived with the shaft-rotating effect. Newton's method is employed to linearize the Reynolds equation and an iterative successive relaxation process is used to solve for the air film pressure. The proposed method is valid for the analysis of film pressure distribution and load capability. This study gives a theoretical basis for the design of a pocket orifice externally pressurized bearing with the shaft-rotating effect considered, where the aerodynamic and aerostatic effects are coupled. Also, the numerical results indicate the difference between the two kinds of bearings mentioned above.

A model is developed to estimate the viscosity of aluminosilicate melts containing CaF 2 , in which the influence of chemical composition is expressed by different types of oxygen ions and CaF 2 clusters. In this study, CaF 2 is assumed to have no effect on the relative amounts of different structures Q i (i50-4) (where the superscript refers to the number of bridging oxygen in a given structural unit), but only acts as a diluter. The viscosity model can be well applied to CaO-FeO-CaF melts. From the isoviscosity curves of the CaO-CaF 2 -SiO 2 system plotted by the present model, it can be concluded that the substitution of CaF 2 for CaO makes the viscosity decrease in an acidic composition area but almost keeps constant in the basic composition area.

The performance characteristics including pressure distribution and vibration of four tilting pads bearing-rotor system were experimentally studied. The acoustic emission (AE) technology was used to investigate the impact between the pad and the shaft while the shaft is rotating. The pressure distributions indicated the film shape of different pads. The major finding was to know how the tilting pad bearing-rotor system worked with impact phenomenon and to propose a method for identifying the occurrence and position of the impact by employing the AE technique.