Abstract
Bump foil journal bearings are prospective applicants for machine elements that can support a small-sized rotor of high-speed rotary machinery. The authors have proposed two models to the bearing, one of which corresponds to the bearing with an excessive static friction between the top and the bump foils and the other to the bearing without the friction. The variation of predicted maximum load capacity of the bearings with respect to the assembly preload was in qualitatively good agreement with the measurement. This study aims at predicting the effect of the design variables of the bearing on the stability threshold speed of the horizontal rigid rotor supported in the model bearings. The modified stability charts show that the effect of two of the variables, the attached angle and the angular extent of top foil, is noticeable, the other two variables, the rigidity of top foil and the equivalent spring constant of bump foil, is modest and the rest of the variables, the density and the thickness of top foil and the pitch angle of bump foil, is negligible. It is also found that the models have to be modified, considering that the top foil is detached from the bump foil.
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