Effect of an out-of-sphericity error on the radial stiffnessof an air dynamic bearing

Woo Chun Choi, Yong Ho Shin, Chung Whan Choi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Out-of-sphericity error is degree of deformation of an air bearing sphere deviated from a perfect sphere. This paper investigates numerically the effect of out-of-sphericity error on the radial stiffness of an air bearing. Three types of out-of-sphericity modes are considered. In this study, the stiffness is calculated from pressure distribution at the bearing surface, which is obtained by solving the Reynolds equation. In some cases, large out-of-sphericity errors are found to improve the stiffness of an air bearing. This implies that an air bearing of perfect hemispheres is not necessarily of the best performance. Thus, much labor and cost in manufacturing air bearings can be saved. In addition, the radial stiffness depends greatly on the force applying direction for bearings of radially deformed stator hemisphere.

Original languageEnglish
Pages (from-to)421-426
Number of pages6
JournalJSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing
Issue number2
Publication statusPublished - 2001


  • Air dynamic bearing
  • Clearance wedge effect
  • Eccentricity
  • Groove
  • Out-of-sphericity error
  • Rotor
  • Stator
  • Stiffness

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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