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Static and dynamic analyisis of inherently compensated aerostatic flat pad bearings

Bhat, N, Barrans, S M, Narasimhan, R, Kumar, A S and Low, T C (2010) Static and dynamic analyisis of inherently compensated aerostatic flat pad bearings. In: ASME 2010 International Mechanical Engineering Congress & Exposition, 12 - 18 November 2010, Vancouver, British Columbia, Canada.

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    Abstract

    The design of aerostatic bearings is becoming of increasing importance 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. Due consideration has to be given to the inlet restrictor design so as to improve the static and the dynamic response of the air bearing. Inherently compensated orifices (also referred to as laminar flow restrictors) although not commonly used in practice due to difficulties encountered in assembly/fabrication of the orifices are known to give highly stable air bearing systems. In this paper we examine the static characteristics and dynamic characteristics of inherently compensated orifice based aerostatic flat pad bearing system. Static performance has been evaluated based on Reynolds equation and mass conservation equation for incompressible flow whilst dynamic performance of the bearing has been evaluated based on same set of equations but based on compressible flow. The change in performance (static and dynamic) of the aerostatic bearing is studied by varying orifice diameter, gap height and supply pressure. 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. Key Words: Air Bearing, Static and dynamic performance, Inherent compensation.

    Item Type: Conference or Workshop Item (Paper)
    Subjects: T Technology > TJ Mechanical engineering and machinery
    Schools: School of Computing and Engineering
    School of Computing and Engineering > Centre for Precision Technologies > Engineering Control and Machine Performance Research Group
    School of Computing and Engineering > Pedagogical Research Group
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    References:

    [1] M. M. Khonsari, and E. R. Booser, Applied Tribology. Wiley-Interscience, 2008, pp. 566.
    [2] New Way Precision, Air Bearing Application and Design Guide. New Way Precision, 2003
    [3] B. Majumdar, and K. Singh, "Analysis of Aerostatic Thrust Bearings with Offset Load," International Journal of Machine Tool Design and Research, vol. 13, no. 2, pp. 65-76, 1973.
    [4] F. Al-Bender, and H. Brussel, "Symmetric Radial Laminar Channel Flow With Particular Reference to Aerostatic Bearings," Journal of Tribology, vol. 114, pp. 630-636, 1992.
    [5] J. Khatait, W. Lin, and W. Lin, "Design and Development of Orifice-type Aerostatic Thrust Bearing," SIMTech Technical Reports, vol. 6, no. 1, pp. 7-12, 2005.
    [6] N. Chen, and K. Ho, "Performance Study of A Hydrostatic Air Thrust Bearing," Wear, vol. 70, pp. 207-217, 1981.
    [7] F. Al-Bender, and H. Brussel, "Tilt Characteristics of
    Circular Centrally Fed Aerostatic Bearings," Tribology
    International, vol. 25, no. 3, pp. 189-197, 1992.
    [8] M. Fourka, Y. Tian, and M. Bonis, "Prediction of the Stability of Air Thrust Bearings by Numerical, Analytical and Experimental Methods," Wear, vol. 198, pp. 1-6, 1996.
    [9] C. Teo, and Z. Spakovszky, "Modeling and Experimental Micro Hydrostatic Gas Thrust Bearing for Micro Turbomachine," Journal of Turbomachinery, vol. 128, pp. 597-605, 2006.
    [10] F. Al-Bender, "On the Modelling of the Dynamic Characteristics of Aerostatic Bearing Films: From Stability Analysis to Active Compensation," Precision Engineering, vol. 33, pp. 117-126, 2009.
    [11] S. Kassab, E. Noureldeen, and M. Shawky, "Effects of Operating Conditions and Supply Hole Diameter on the Performance of A Rectangular Aerostatic Bearing," Tribology International, vol. 30, no. 7, pp. 533-545, 1997.
    [12] Y. Li, and H. Ding, "Influences of the Geometrical Parameters of Aerostatic Thrust Bearing with Pocketed Orifice -type Restrictor on Its Performance," Tribology International, vol. 40, pp. 1120-1126, 2007.
    [13] A. Mishra, "Analysis if Pneumatic Instability of An Aerostatic Rectangular Thrust Bearing with Offset Load," Wear, vol. 122, pp. 1-12, 1988.
    [14] K. Stout, and F. Sweeney, "Design of Aerostatic Flat Pad Bearings Using Pocketed Orifice Restrictors," Tribology International, vol. 17, no. 4, pp. 191-198, 1984.
    [15] K. Stout, "Design of Aerostatic Fat Pad Bearings Using Annular Orifice Restrictors," Tribology International, vol. 18, no. 4, pp. 200-214, 1985.
    [16] F. B. Hildebrand, Advanced Calculus for Applications.
    New Jersey: Prentice-Hall, 1976, pp. 733.
    [17] T. R. Chandrupatla, and A. D. Belegundu, Introduction to Finite Elements in Engineering. 1997, pp. 414.
    [18] C. S. Desai, and T. Kundu, Introductory Finite Element Method. CRC, 2001, pp. 496.
    [19] Introduction to Finite Element Method Pohang University of Science and Technology, 2005.
    [20] Hydrostatic Journal Bearings 2009.
    [21] Z. Liu, G. Zhang, and H. Xu, "Performance Analysis of Rotating Externally Pressurized Air Bearings," Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, vol. 223, no. 4, pp. 653-663, 2009.
    [22] J. Lund, "A Theoretical Analysis of Whirl Instability and Pneumatic Hammer for a Rigid Rotor in Pressurized Gas Journal Bearings," Journal of Lubrication Technology, Part F, Transaction of ASME, vol. 89, pp. 154-166, 1967.

    Depositing User: Simon Barrans
    Date Deposited: 26 Apr 2011 10:29
    Last Modified: 26 Apr 2011 15:43
    URI: http://eprints.hud.ac.uk/id/eprint/10216

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