Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1492
標題: 氣潤式多孔性頸軸承之分析
Performance of Porous Air-Lubricated Journal Bearings
作者: 賴勁憲
關鍵字: journal bearing;頸軸承;porous;多孔性介質
出版社: 機械工程學系
摘要: 
摘要
本論文以雷諾方程式來描述頸軸承之運動特性,並且以達西定理分析多孔性介質之壓力分布特性,最後得到一聯立之非線性統御方程式,以此來解析氣潤式多孔性頸軸承之功能行為。
在本論文中主要對無限長之氣潤式多孔性頸軸承作分析,以可壓縮與不可壓縮流體作比較及以Λ(軸承轉動參數)、ε(偏心比)與K(多孔性介質滲透率)等無因次化參數對所建立之液動方程式進行解析。
經過分析後,發現氣潤式頸軸承具有均勻的正壓力分佈,但其負荷能力卻較相當隻不可壓縮軸呈為低,負荷變化時,其姿態角有傾向於呈一定值狀態,當多孔性介質的孔性滲透率越小,或軸承轉速增加時,則軸承壓力與負荷能力亦隨之增大。

Abstract
This paper applies Reynolds equation to analyze the lubrication performance of the journal bearing. Darcy's law is used to describe the pressure distribution of the porous media. A nonlinear coupled equation are then used to analyze the characteristics of the porous journal bearings
Three dimensionless parameters, namely, the permeability factor K, the bearing numberΛ, and the eccentricity ratioε,are employed to characterize the bearing performance. The results of the compressible air bearing compared with that of the equivalent incompressible bearing are proposed in this analysis.
The results show that the positive pressure solutions are uniformly distributed on the bearing surface of the porous air-lubricated journal bearing. The loading capacity of the porous air bearings is lower than that of an equivalent incompressible bearing. The attitude angles of the porous air-lubricated bearing appear to be a constant value as the loads of the air bearing vary. The pressure distributions and hence the loading capacity of the porous air-lubricated bearings increase when low permeability of the porous media and high rotational speed of the bearing are used.
URI: http://hdl.handle.net/11455/1492
Appears in Collections:機械工程學系所

Show full item record
 

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.