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標題: Characteristics of Externally Pressurized Porous Gas Bearings Considering Structure Permeability
作者: Lee, C.C.
You, H.I.
關鍵字: Porous Bearings;Permeability;Externally Pressurized;lubricated journal bearing;slip
Project: Tribology Transactions
期刊/報告no:: Tribology Transactions, Volume 52, Issue 6, Page(s) 768-776.
The performance of a finite length porous journal bearing fed by externally pressurized air is numerically analyzed in the present study. A quasi-linear numerical scheme associated with an underrelaxation factor is used to solve the pressure solutions of the nonlinear coupled partial differential equation (PDE). Two characteristic parameters, i.e., the feeding parameter p and a conventional bearing number , are involved in the analysis. The results show that the aerodynamic lubricating effect is dominant for the porous bearing having a small p number, whereas the aerostatic effect prevails inside the bearing space as the p number is large. When the permeability parameter p is small, the aerodynamic effect is further promoted for the bearing operating at heavy load; herein the minimum film thickness becomes relatively small. It is found that a bearing with a small p will have a higher risk for the journal shaft to touch the bearing wall than a bearing with large p. Therefore, as far as the bearing safety and loading capacity are concerned, a porous journal bearing with p ranging between 0.5 and 1 is recommended in practical use.
ISSN: 1040-2004
DOI: 10.1080/10402000903097403
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