3 패드 가스 포일 저널 베어링의 프리로드 증가에 따른 성능 해석
Analysis of Three-Pad Gas Foil Journal Bearing for Increasing Mechanical Preloads
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In this study, a three-pad gas foil journal bearing with a diameter of 40 mm and an axial length of35 mm was modeled to predict the static and dynamic performances with regard to an increasing mechanical preload. The Reynolds equation for an isothermal and isoviscous ideal gas was coupled with a simple elastic foundationfoil model to calculate the hydrodynamic pressure solution iteratively. In the prediction results, the journaleccentricity, journal attitude angle, and minimum film thickness decreased, but the friction torque increased withthe preload. A quick comparison implied a lower load capacity but higher stability for a three-pad gas foil bearingcompared to a one-pad gas foil journal bearing. The direct stiffness coefficients increased with the preload, butthe cross-coupled stiffness coefficients decreased. The direct damping coefficient increased in the horizontaldirection but decreased in the vertical direction as the preload increased. These model predictions will be usefulas a benchmark against experimental test data.
Abstract
In this study, a three-pad gas foil journal bearing with a diameter of 40 mm and an axial length of35 mm was modeled to predict the static and dynamic performances with regard to an increasing mechanical preload. The Reynolds equation for an isothermal and isoviscous ideal gas was coupled with a simple elastic foundationfoil model to calculate the hydrodynamic pressure solution iteratively. In the prediction results, the journaleccentricity, journal attitude angle, and minimum film thickness decreased, but the friction torque increased withthe preload. A quick comparison implied a lower load capacity but higher stability for a three-pad gas foil bearingcompared to a one-pad gas foil journal bearing. The direct stiffness coefficients increased with the preload, butthe cross-coupled stiffness coefficients decreased. The direct damping coefficient increased in the horizontaldirection but decreased in the vertical direction as the preload increased. These model predictions will be usefulas a benchmark against experimental test data.
참고문헌 (10)
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