Calculation Method for Fatigue Life of Wave Foil Type Air Foil Bearings
Taking wave foil type air foil bearings as examples,a mechanical model of wave foil deformation is built,and a fluid-solid coupling algorithm for solving gas film pressure is established by combining Reynolds equation of compressible gas.On this basis,the stress analysis of top foil and wave foil is carried out,and the calculation method for fatigue life of top foil and wave foil is established by using linear fatigue damage accumulation theory.The numerical study is carried out with specific examples.The results show that the fatigue damage rate of wave foil is much higher than that of top foil when the bearings are operated normally;the fatigue life of the bearings is mainly determined by wave foil under the premise of ignoring friction and wear of top foil during start and stop stage;the fatigue life of wave foil decreases with the increase of arc angle of wave arch,arc radius of wave arch and wave distance,and increases with the increase of radius gap and thickness of wave foil.
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