유체기계공업학회:학술대회논문집
- 유체기계공업학회 2002년도 유체기계 연구개발 발표회 논문집
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- Pages.453-458
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- 2002
공기 포일 베어링으로 지지되는 무급유 터보 과급기 회전체 설계에 대한 연구
Study on the Oil-free Turbocharger Supported by Air Foil Bearing
초록
The feasibility study on supporting a turbocharger rotor on air foil bearing is investigated. Based on finite difference method and Newton-Raphson method, the static equilibrium position of a turbocharger rotor is predicted. And using finite difference method and perturbation method, dynamic characteristics of air foil bearings are calculated. Rotordynamic analysis is performed by finite element method, with collaboration of calculated stiffness and damping of foil bearing. The effect of compliance and clearance of bump foil bearing on the oil-free turbocharger is investigated in terms of rotordynamics. And the critical speeds, eccentricity ratio, vibration amplitude, and stability are considered. It is demonstrated that foil bearings offer a rlausible replacement for oil-lubricated bearings in turbocharger.