The vibration characteristics of hybrid journal gas bearing systems

Abstract

The thesis contains an introduction to the field of lub cEltion in general and gas lubrication in cular. The steady state and vibration propert of both externally pressurised and self acting journal bearings arQ discussed and an exposition of recent theory con- cerned unstable free vibrations in self acting bearings given. A new description of the general mechanism by whic.h such vibrations arise is presented, and the implications of the theory are discussed in det 1 th particular reference to the hybrid type of bearing. It is found possible to give a concise explanation of the of half speed whirl instability widely observed these The general principles of constructing an experimental test rig for examining the practical performance of hybrid bearings the high speed range are given, together with a led description of the ~ in. diameter, annular feed hole bearing used. A method of examining the aerostatic performance of the bearing, under the conditions of variable supply pressure and clearance used, is developed from the work of Shires and Robinson. Experimental measurements of steady state stiffness are made and correlated to the theoretical prediction. The free vibration response of the rotor to a shock load is examined, being a planar vibration with the rotor stationary, and an orbital motion with the rotor revolving.

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