KSTLE International Journal

Korean Tribology Society (한국트라이볼로지학회)
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A Study on Hydrodynamic Coefficient Characteristics of Air Bearing for High Speed Journal

  • Lee, Jong-Ryul (Engineering Research Institute, Gyeongsang National University) ;
  • Lee, Deug-Woo (Department of Precision Mechanical Engineering, Pusan National University) ;
  • Soeng, Sueng-Hak (Department of Precision Mechanical Engineering, Pusan National University) ;
  • Lee, Yong-Chul (Department of Precision Mechanics, Yonam Institute of Digital Technology)
  • Published : 2003.12.01
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Abstract

This paper presents the hydrodynamic effect by the journal speed, eccentricity and source positions in order to overcome the defects of air bearing such as low stiffness and damping coefficient. Choosing the two row source position of air bearing is different from existing investigations in the side of pressure distribution of air film because of the high speed of journal and the wedge effects by the eccentricity. These optimal choices of the two row source positions enable us to improve the performance of the film reaction force and loading force as making the high-speed spindle. In this paper, The pressure behavior in theory of air film in high speed region of journal according to the eccentricity of journal and the source positions analyzed. The theoretical analysis has been identified by experiments. The results of investigated characteristics may be applied to precision devices like ultra-precision grinding machine and ultra high-speed milling.

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References

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