Stability of a new type of hydrostatic hydrodynamic floating ring gas bearing

In this paper a new type of floating ring gas bearing in which a "floating ring" is combined with an "orifice-annular and shallow-pocket" gas bearing is introduced. The stability of this new type of floating ring gas journal bearing is theoretically analyzed by use of the modified 8-stiffness and damping coefficients method The variation of the dimensionless critical mass of the rotor with a clearance ratio C-2/C-1, mass ratio m(2)/m(1), given ring speed ratio omega(2)/omega(1) supply pressure P-S, eccentricity ratio of inner film epsilon(1) and width ratio of the shallow-pocket (l/L)(u) is presented. The variations of the dimensionless load capacity of this type of gas bearing with the above-mentioned parameters are also given.