고속 공기 포일 베어링의 정적ㆍ동적 특성에 관한 실험적 연구

Experiments were conducted to determine the structural static and dynamic characteristics of air foil bearings. The housing of the bearing on the journal was driven by an impact hammer which was used to simulate dynamic forces acting on the bump foil with various loading condition. Two different bump foils (Cu-coated bump and viscoelastic bump) were tested and the static and dynamic coefficients of two bump foils compared, based on the experimental measurements for a wide range of operating conditions. The static and dynamic characteristics of air foil bearings were extracted from the frequency response function by least square method and Ⅳ(Instrumental Variable) method. The experiment was tested at 0rpm and 10,000~16,000rpm, and loaded on 50~150N. From the test results, the possibility of the application of high load and high speed condition is suggested.