Reduced-order models have been reported in the literature that can be used to predict the harmonic response of mistuned bladed disks. It has been shown that in many cases they exhibit structural fidelity comparable to a finite element analysis of the full bladed disk system while offering a significant improvement in computational efficiency. In these models the blades and disk are treated as distinct substructures. This paper presents a new, simpler approach for developing reduced-order models in which the modes of the mistuned system are represented in terms of a subset of nominal system modes. It has the following attributes: the input requirements are relatively easy to generate; it accurately predicts mistuning effects in regions where frequency veering occurs; as the number of degrees-of-freedom increases it converges to the exact solution; it accurately predicts stresses as well as displacements; and it accurately models the deformation and stresses at the blades’ bases.
A Reduced-Order Model of Mistuning Using a Subset of Nominal System Modes
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, IN, June 7–10, 1999; ASME Paper 99-GT-288. Manuscript received by IGTI Oct. 1998; final revision received by the ASME Headquarters March 1999. Associate Editor: D. Wisler.
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Yang , M., and Griffin, J. H. (March 1, 1999). "A Reduced-Order Model of Mistuning Using a Subset of Nominal System Modes ." ASME. J. Eng. Gas Turbines Power. October 2001; 123(4): 893–900. https://doi.org/10.1115/1.1385197
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