Maximum Load Capacity Profiles for Gas Thrust Bearings Working Under High Compressibility Number Conditions

[+] Author and Article Information
I. Iordanoff

Laboratoire de mecanique des contacts, INSA de Lyon, 20 avenue Albert Einstein, 69621 Villeurbanne Cedex, France

J. Tribol 120(3), 571-576 (Jul 01, 1998) (6 pages) doi:10.1115/1.2834589 History: Received March 04, 1997; Revised July 01, 1997; Online January 30, 2008


To meet the requirements of new commercial equipment, performances of air thrust bearings always have to be improved. This work is concerned with the research of the converging profile that will give high load capacities. When compressibility effects increase (when the compressibility number Λ is over 50), a one-dimensional study shows that the best bearing is a composite bearing, i.e., one in which the leading portion has a constant slope followed by a surface parallel to the runner. For each compressibility number, entrance film thickness H1 and the transition angle θ1 define the best profile. In a two-dimensional study, for compressibility numbers from 10 to 1000, comparison in term of load capacity is made between tapered and composite profiles. It outlines the better load capacity of the composite bearings and confirms the good results obtained by Heshmat (1983) and Gray (1981) with such profiles.

Copyright © 1998 by The American Society of Mechanical Engineers
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