Abstract: A foil journal bearing comprising a housing having an opening to receive the journal of a shaft, and a plurality of foil supports extending longitudinally through the opening. The foil supports having arcuate inner and outer surfaces and are positioned to transversely surround the journal. An endless foil element encircles each foil support in a direction transverse the longitudinal axis of the element to engage and support the journal. Rods are positioned between the outer arcuate surface of each foil support and respective foil element that are movable relative to the foil support for varying the stiffness of each foil element.

Abstract: A hydrostatic bearing having two axial grooves on opposite sides of the bearing for breaking the rotational symmetry in the dynamic force coefficients thus reducing the whirl frequency ratio and increasing the damping and stiffness of the hydrostatic bearing.

Abstract: An aircraft engine rotor system is provided with a squeeze film damper mechanism that allows axial flow of lubricant in a squeeze film region without creating a gross circumferential distortion of pressure around the damper journal. The outer race of a rolling-element bearing assembly which assembly is disposed in a journal bearing enclosure, is provided with a number of encircling annular slots, these slots providing space for reception of a spaced pair of serrated rings which are fixed to an inner wall surface of the journal bearing enclosure, the serrated peripheries of the rings being in contact with the bearing journal enclosure inner wall space. Oil enters the squeeze film region through the serrations in one of the rings and outflows through those in the other ring.