In order to study the effects of foil friction between bump foil and bearing housing on dynamics characterict of rotor-foil bearing system

a test rig was developed for bump-type gas foil bearing. By experiment comparing between two sets of bearing supporting a 0.458kg rotor which have different surface roughness of bearing housing cylindrical hole with speed from 0-80000r/min

the effects of friction between bump foil and bearing housing on rotor dynamics charecteristic are studied. The results indicate that bump-type gas foil journal bearing with 19.98mm diameter can support the rotor's stable running at a quite high speed

and the vibration amplitude at bearing support is around 20μm. Reducing the surface roughness (friction coefficient) of bearing housing cylindrical hole enables relatively easy slippage of bump foil between the top foil and bearing housing

helping to absorb and eliminate high frequency vibration of rotor

and improve the stability of rotor system.