In order to analyze the static stiffness

structure stiffness and viscous damping of bearing under different factors

the experiment rigs for gas foil bearing (GFB) static and dynamic characteristic experiment were established. By changing the size of the journal of a same bearing

the influences of radial clearance on the static and dynamic properties of experiment bearings were studied. Additionally

the different bump foils

foil materials

ways of heat treatment and other factors affecting bearing elastic structure properties were also investigated. Result shows that

with the decreasing radial clearance of the bearing

the static stiffness and dynamic structure stiffness increase gradually and equivalent viscous damping increases first and then decreases; different bump foils and foil materials play a major role in GFBs' structural properties.