Two deterministic mistuning models utilizing component mode synthesis methods are used in a Monte Carlo simulation to generate mistuned response distributions for a geometrically perturbed integrally bladed rotor. The first method, a frequency-perturbation approach with a nominal mode approximation used widely in academia and industry, assumes airfoil geometric perturbations alter only the corresponding modal stiffnesses while its mode shapes remain unaffected. The mistuned response is then predicted by a summation of the nominal modes. The second method, a geometric method utilizing non-nominal modes, makes no simplifying assumptions of the dynamic response due to airfoil geometric perturbations, but requires recalculation of each airfoil eigen-problem. A comparison of the statistical moments of the mistuned response distributions and prediction error is given for three different frequency ranges and engine order excitations. Further, the response distributions are used for a variety of design and testing scenarios to highlight impacts of the frequency-based approach inaccuracy. Results indicate the frequency-based method typically provides conservative response levels.
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Materials Engineering,
Wright State University,
e-mail: Joseph.Slater@wright.edu
Air Force Research Laboratory,
Wright-Patterson Air Force Base,
e-mail: Charles.Cross@wpafb.af.mil
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September 2013
Research-Article
Probabilistic Mistuning Assessment Using Nominal and Geometry Based Mistuning Methods
Joseph A. Beck,
Joseph A. Beck
1
e-mail: Joseph.Beck@wpafb.af.mil
1Corresponding author.
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Jeffrey M. Brown,
Jeffrey M. Brown
e-mail: Jeffrey.Brown@wpafb.af.mil
Air Force Research Laboratory,
Turbine Engine Division
,Air Force Research Laboratory,
Wright-Patterson Air Force Base, OH 45433
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Joseph C. Slater,
Materials Engineering,
Wright State University,
e-mail: Joseph.Slater@wright.edu
Joseph C. Slater
Department of Mechanical and
Materials Engineering,
Wright State University,
Dayton, OH 45435
e-mail: Joseph.Slater@wright.edu
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Charles J. Cross
Air Force Research Laboratory,
Wright-Patterson Air Force Base,
e-mail: Charles.Cross@wpafb.af.mil
Charles J. Cross
Turbine Engine Division
,Air Force Research Laboratory,
Wright-Patterson Air Force Base,
OH 45433
e-mail: Charles.Cross@wpafb.af.mil
Search for other works by this author on:
Joseph A. Beck
e-mail: Joseph.Beck@wpafb.af.mil
Jeffrey M. Brown
e-mail: Jeffrey.Brown@wpafb.af.mil
Air Force Research Laboratory,
Turbine Engine Division
,Air Force Research Laboratory,
Wright-Patterson Air Force Base, OH 45433
Joseph C. Slater
Department of Mechanical and
Materials Engineering,
Wright State University,
Dayton, OH 45435
e-mail: Joseph.Slater@wright.edu
Charles J. Cross
Turbine Engine Division
,Air Force Research Laboratory,
Wright-Patterson Air Force Base,
OH 45433
e-mail: Charles.Cross@wpafb.af.mil
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received October 13, 2012; final manuscript received November 2, 2012; published online June 24, 2013. Editor: David Wisler.
J. Turbomach. Sep 2013, 135(5): 051004 (9 pages)
Published Online: June 24, 2013
Article history
Received:
October 13, 2012
Revision Received:
November 2, 2012
Citation
Beck, J. A., Brown, J. M., Slater, J. C., and Cross, C. J. (June 24, 2013). "Probabilistic Mistuning Assessment Using Nominal and Geometry Based Mistuning Methods." ASME. J. Turbomach. September 2013; 135(5): 051004. https://doi.org/10.1115/1.4023103
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