Application Status and Failure Mode Analysis of Hydrodynamic Gas Foil Bearings for Air Cycle Machines Used in Aircrafts
The hydrodynamic gas foil bearings are ideal supporting devices for internal shaft systems of air cycle mechines(ACMs)for aircrafts because of compact structure,excellent stability,oil-free lubrication,high rotational speed capability and low maintenance requirements,etc.The structures of the bearings are analyzed,and the research progress of gas-suspended ACMs in improving rotational speed and load capacity,reducing volume,extending service life and broadening operating temperature range is reviewed.The failure modes of the bearings for ACMs are discussed,including bearing-rotor failure,overload failure,improper bearing clearance assembly,start-stop wear failure,external impurity wear failure and high-temperature failure,and the corresponding failure causes and failure mechanisms are analyzed.Combined with current research hotspot of the bearings,the future development trend of ACMs supported by the bearings is predicted to be higher rotational speed,larger load capacity,smaller volume,longer service life and broader temperature range.
plain bearinghydrodynamic gas bearingair cycle cooling systemfailure modedevelopmental trend
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