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|標題:||Characteristics of Externally Pressurized Porous Gas Bearings Considering Structure Permeability||作者:||Lee, C.C.
|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.||摘要:||
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.
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