Stability of a New Type of Hydrostatic/Hydrodynamic Floating Ring Gas Bearing

Abstract

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 C₂/C₁, mass ratio m₂/m₁, given ring speed ratio ω₂/ω₁, supply pressure P_s, eccentricity ratio of inner film ε₁ 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.

KEY WORDS:

• Stability
• Floating Ring Bearing
• Gas Bearing
• Film Geometry