Influence of Aerodynamic Preloads and Clearance on the Dynamic Performance and Stability Characteristic of the Bump-Type Foil Air Bearing

The dry lubricated bump-type foil air bearing enables a carrying load capacity due to pressure build up in convergent film. Since the provides low power dissipation above lift-off speed and flexible an adaptivity against high temperatures, manufacturing errors or rotor growth, is particular suitable for rotating machineries. corresponding dynamic behavior depends on operational parameters, of structure, circumferential clearance. In order avoid suppress critical subsynchronous motion at rotational speeds, many researchers recommend adding aerodynamic preload bore shape, representing transition from circular lobed shape. addition positive effects stability, preliminary studies demonstrated degrading stiffness damping increasing values. This observation leads assumption, that value meets optimum with respect load-capacity, speed. With aim deriving appropriate lobe configuration design bearing, this work performs comprehensive numerical investigations performance stability characteristic as function minimum To end, uses steady-state transient analysis methods optimal aeroydnamic values