Pneumomechanical Critical Speed Control for Gas Turbine Engine Shafts.

摘要

The purpose of the program was to evaluate and demonstrate the feasibility of utilizing gas-lubricated foil bearings to resist high shaft excursions as the shaft advances through bending criticals and to determine the extent a shaft critical can be moved (increased) through use of these bearings. The program was initiated by design of a critical speed control (CSC) test rig. A critical speed and shaft displacement analysis was made to determine the loads imposed on the midspan foil bearing as the rotor advances through two predominantly bending critical speeds. The program resulted in a successful demonstration of the foil bearing as a device to diminish shaft excursion and shift the frequency of critical shaft speeds. (Modified author abstract)