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Rotor-Bearing Dynamics Design Technology. Part VII: The Three Lobe Bearing And Floating Ring Bearing

Report Number: AFAPL TR 65-45 Part 7
Author: Lund, J. W.
Corporate Author: Mechanical Technology Inc Latham NY
Laboratory: Air Force Aero Propulsion Laboratory
Date of Publication: 1968-02
Pages: 292
Contract: AF 33(615)-3238
Project: 3048
Task: 304806
AD Number: AD0829895

The volume treats three special bearing types selected for study because of their favorable stability characteristics and, hence, their potential for use in high speed rotating machinery applications. The three bearing types are: (a) The Three Lobe Journal Bearing; (b) The Floating Sleeve Bearing with an Incompressible Lubricant; (c) The Floating Sleeve Bearing with a Compressible Lubricant. In the floating sleeve bearings, the ring is prevented from rotating but is otherwise free to move. The ring is floated by pressurizing the outer film of the bearing. In the case of a compressible lubricant, the inner film is pressurized as well. The volume gives extensive design data in form of charts and tables from which the bearing dimensions can be obtained for a given application. Data are given for bearing flow, friction power loss and the speed at which hydrodynamic instability sets in. In addition, two computer programs accompany the volume, and instructions and listings of the programs are included. The programs may be used to obtain data for cases not covered by the presented design data.

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