Abstract:The TF30 P-lll + engine developed a high-pressure spool rotor dynamic instability when it went into production in mid-1986. Vibration rejection rates were as high as 50% until the instability was eliminated with the incorporation of an oil-film damper at the high-pressure turbine (HPT) bearing. This paper focuses on the analytical treatment of the instability and includes a summary of engine testing that was done to help diagnose the problem. Correlation between test and analysis implicates the aerodynamic cro… Show more
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