Probabilistic rotor life assessment using reduced order models

Article type: Research Article

Authors: Beachkofski, Brian K.

Affiliations: Air Force Research Laboratory, Propulsion Directorate, 1950 5th Street, Wright-Patterson AFB, OH 45433, USA

Note: [] Corresponding author. Tel.: +1 937 255 7219; E-mail: brian.beachkofski@wpafb.af.mil

Abstract: Probabilistic failure assessments for integrally bladed disks are system reliability problems where a failure in at least one blade constitutes a rotor system failure. Turbine engine fan and compressor blade life is dominated by High Cycle Fatigue (HCF) initiated either by pure HCF or Foreign Object Damage (FOD). To date performing an HCF life assessment for the entire rotor system has been too costly in analysis time to be practical. Although the substantial run-time has previously precluded a full-rotor probabilistic analysis, reduced order models make this process tractable as demonstrated in this work. The system model includes frequency prediction, modal stress variation, mistuning amplification, FOD effect, and random material capability. The model has many random variables which are most easily handled through simple random sampling.

Keywords: High cycle fatigue, probabilistic analysis, reduced order model, system reliability

DOI: 10.3233/SAV-2009-0490

Journal: Shock and Vibration, vol. 16, no. 6, pp. 581-591, 2009