Abstract
The purpose of this work is to evaluate the effect of the external springs and dampings on the stability of the herringbone grooved aerodynamic journal bearings. The change of the air film thickness which is caused by the centrifugal growth of the rotor under the ultra-high-speed rotation was also considered. Nonlinear lubrication equation based on the narrow groove theory was solved by the perturbation method, and the stability boundary charts of the bearing system were obtained. It was cleared that the stability boundary of the herringbone grooved aerodynamic journal bearings supported by the suitable springs and dampings can be heightened more than two times the rigidly supported herringbone grooved aerodynamic journal bearings.
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