Pneumomechanical Critical Speed Control for Gas Turbine Engine Shafts.
Abstract
Initial evaluation of the use of gas-lubricated intershaft foil bearings to reduce inner spool vibration levels in small gas-turbine aircraft engines has been successfully concluded. A Hydresil intershaft foil bearing was applied to a power turbine shaft simulator operating on elastically-mounted ball bearings without support damping. A series of tests showed that the two-pad and three-pad Hydresil bearings are superior to the 360-degree bearing for the journal size and rotor speeds tested. Rotor balancing via the recently-developed MTI Multiplane-Multispeed Balancing Procedure was used to suppress the first (bending) shaft-bearing system critical speed and a pedestal resonance, and to leave a distinct vibration peak at the second (bending) critical speed. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1973
- Accession Number
- AD0772805
Entities
People
- Jere M. Reddecliff
- Richard A. Cundiff
- Robert H. Badgley