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Title: Performance of inherently compensated flat pad aerostatic bearings subject to dynamic perturbation forces
Authors: Bhat, N.
Kumar, S. 
Tan, W.
Narasimhan, R.
Low, T.C.
Keywords: Air bearing
Inherent compensation
Static and dynamic performance
Issue Date: Jul-2012
Citation: Bhat, N., Kumar, S., Tan, W., Narasimhan, R., Low, T.C. (2012-07). Performance of inherently compensated flat pad aerostatic bearings subject to dynamic perturbation forces. Precision Engineering 36 (3) : 399-407. ScholarBank@NUS Repository.
Abstract: The importance of air bearing design is growing in engineering. As the trend to precision and ultra precision manufacture gains pace and the drive to higher quality and more reliable products continues, the advantages which can be gained from applying aerostatic bearings to machine tools, instrumentation and test rigs is becoming more apparent. The inlet restrictor design is significant for air bearings because it affects the static and dynamic performance of the air bearing. For instance pocketed orifice bearings give higher load capacity as compared to inherently compensated orifice type bearings, however inherently compensated orifices, also known as laminar flow restrictors are known to give highly stable air bearing systems (less prone to pneumatic hammer) as compared to pocketed orifice air bearing systems. However, they are not commonly used because of the difficulties encountered in manufacturing and assembly of the orifice designs. This paper aims to analyse the static and dynamic characteristics of inherently compensated orifice based flat pad air bearing system. Based on Reynolds equation and mass conservation equation for incompressible flow, the steady state characteristics are studied while the dynamic state characteristics are performed in a similar manner however, using the above equations for compressible flow. Steady state experiments were also performed for a single orifice air bearing and the results are compared to that obtained from theoretical studies. A technique to ease the assembly of orifices with the air bearing plate has also been discussed so as to make the manufacturing of the inherently compensated bearings more commercially viable. © 2012 Elsevier Inc. All rights reserved.
Source Title: Precision Engineering
ISSN: 01416359
DOI: 10.1016/j.precisioneng.2012.01.002
Appears in Collections:Staff Publications

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