공기 포일 스러스트 베어링의 하중지지능력에 관한 연구
A study of the Load Capacity of Air Foil Thrust Bearings
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초록
Air foil thrust bearings are the critical components available on high-efficiency turbomachinery which need an ability to endure the large axial force. Air foil bearings are self-acting hydrodynamic bearings that use ambient air as their lubricant. Since the air is squeezed by the edge of compliance-surface of bearing, hydrodynamic force is generated. In this study, we measured the air film thickness and obtained the minimum film thickness experimentally. To increase the maximum load capacity, compliance of sub-structure was controlled. From numerical analyses, it is seen that, if the air film thickness is distributed more uniformly by variable compliance, the thrust bearings can take more axial load.
Abstract
Air foil thrust bearings are the critical components available on high-efficiency turbomachinery which need an ability to endure the large axial force. Air foil bearings are self-acting hydrodynamic bearings that use ambient air as their lubricant. Since the air is squeezed by the edge of compliance-surface of bearing, hydrodynamic force is generated. In this study, we measured the air film thickness and obtained the minimum film thickness experimentally. To increase the maximum load capacity, compliance of sub-structure was controlled. From numerical analyses, it is seen that, if the air film thickness is distributed more uniformly by variable compliance, the thrust bearings can take more axial load.
참고문헌 (6)
- Heshmat, H, "Analysis of Gas Lubricated Compliant Thrust Bearing", J. of Lubrication Technology, 105(105), pp.638~646 (1983)
- Heshmat, C. A, "Analysis of Gas Lubricated Foil Thrust Bearings Using Coupled Finite Element and Finite Difference Methods", J. of Tribology, 122, pp.199~204 (2000)
- Iordanoff, I, "Maximum Load Capacity Profiles for Gas Thrust Bearings Working Under High Compressibility Number Conditions", J. of Tribology, 120, pp.571~576 (1998)
- Park, D. J, "Theoretical Considerations of Static and Dynamic Characteristics of Air Foil Thrust Bearing with Tilt and Slip Flow", Tribology International, 41(4), pp.282~295 (2008)
- Load Capacity Estimation of Foil Air Journal Bearings for Oil-Free Turbomachinery Apllication, "Dellacorte C", ~, pp.NASA (2000), TM-2000-209782
- 이용복, "공기윤활 범프 저어널 베 어링의 부상 특성에 관한 연구", 한국윤활학회지, 17(6), pp.441~446 (2001)