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Hydrodynamically air-lubricated foil journal bearings are prospective applicants for machine elements that can support a small-sized rotor of high-speed rotary machinery, such as a micro gas turbine. The smooth surface of the bearing deforms elastically, depending on an applied bearing load, since it is a flexible foil that is supported elastically. Bump foil journal bearing is a kind of the bearings. The bearing consists of two foils. One is cylindrical and named as a top foil. The other is corrugated and named as a bump foil. The top foil is supported elastically by the bump foil. As the foils are forced into the bearing sleeve in assembling the bearing, the top foil deforms due to the assembly preload from the bump foil. The previous prediction was conducted without the preload being considered. This study aims at predicting the maximum load capacity of the bearing with the preload, by using two models. One corresponds to the bearing with an infinitely static friction between the two foils and the other to the bearing without the friction. It is found that each of the bearing design variables has an effect on the capacity obtained with the preload being considered

Effect of Design Variables on Maximum Load Capacity of Hydrodynamically Air-Lubricated Foil Journal Bearings with Assembly Preload Applied