Pneumomechanical Critical Speed Control for Gas Turbine Engine Shafts.
Abstract
The object of the subject program was to further evaluate the application of gas-lubricated foil bearings to control high-speed turbomachine shaft critical speeds and/or amplitude of excursion. The work was intended to expand upon previous efforts by (1) incorporating a simulated H.P. rotor to house the intershaft foil bearings such that various interaction effects could be assessed, and (2) evaluating a tension type foil intershaft bearing. A two rotor test rig which simulated the dynamic characteristics of a two spool aircraft gas turbine engine for testing tension type foil intershaft bearings was designed and constructed. Test results demonstrated that the simulated L.P. rotor could be operated through the region of the second critical speed with the foil intershaft bearings installed; whereas it could not if the foil bearings were not installed. Furthermore, the foil bearings attenuated all rotor amplitudes between the first and second critical speeds. Detrimental interaction effects between high and low speed rotors were not observed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1975
- Accession Number
- ADA021427
Entities
People
- Robert S. Van Huysen
- Warren D. Waldron