Thin film lubrication (TFL) and elasto-hydrodynamic lubrication (EHL) are different lubrication states, their lubrication mechanisms are different, but the transition from EHL to TFL is a continuous process at the aspect of film thickness change, it is important to establish a physical-numerical model that can be suited for both EHL and TFL. Based on rheological, the change of micro thickness is expressed by the change of viscosity, then the micro problem of TFL can be turn to macro problem. The adsorption layer is divided into two parts formatted by static contact and shear force in the calculation. In a given static adsorption film, other oil film parts will be comprehensive consideration, modified formula of the overall average equivalent viscosity is gained by the method of combining numerical calculation and experiment, then numerical model is established for both EHL and TFL. TFL and EHL typical characteristics and the effectiveness of the model can be obviously shown by the results.
In order to analyze the feature of high-load and high-stiffness gas bearing with tapered recess, the complete gas field consisting of supply hole and clearance is built up, and a laminar flow model and a sectional turbulent-laminar flow model are respectively applied to calculate the pressure distribution of centrally-fed gas bearing with tapered recess in different clearances. The theoretical results agree in general with the experimental. The experimental result demonstrates its high load, however its big gas cavity. On the above basis a circular ring gas supply bearing with tapered recess is presented, the calculation result shows that for this new type of ring inlet bearing the pressure drop in entrance area will be reduced effectively even with smaller tapered recess height, and compared with centrally-fed gas bearing with tapered recess, its gas recess volume decreased and stability increased, while the load capacity is basically the same.
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