The effects of disk flexibility and multistage coupling on the dynamics of bladed disks with and without blade mistuning are investigated. Both free and forced responses are examined using finite element representations of example single and two-stage rotor models. The reported work demonstrates the importance of proper treatment of interstage (stage-to-stage) boundaries in order to yield adequate capture of disk-blade modal interaction in eigenfrequency veering regions. The modified disk-blade modal interactions resulting from interstage-coupling-induced changes in disk flexibility are found to have a significant impact on (a) tuned responses due to excitations passing through eigenfrequency veering regions, and (b) a design’s sensitivity to blade mistuning. Hence, the findings in this paper suggest that multistage analyses may be required when excitations are expected to fall in or near eigenfrequency veering regions or when the sensitivity to blade mistuning is to be accounted for. Conversely, the observed sensitivity to disk flexibility also indicates that the severity of unfavorable structural interblade coupling may be reduced significantly by redesigning the disk(s) and stage-to-stage connectivity. The relatively drastic effects of such modifications illustrated in this work indicate that the design modifications required to alleviate veering-related response problems may be less comprehensive than what might have been expected.
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January 2003
Technical Papers
Effects of Multistage Coupling and Disk Flexibility on Mistuned Bladed Disk Dynamics
R. Bladh, Graduate Student,
R. Bladh, Graduate Student
Department of Mechanical Engineering, The University of Michigan, 2250 G. G. Brown Building, Ann Arbor, MI 48109-2125
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M. P. Castanier, Assistant Research Scientist,
e-mail: mpc@umich.edu
M. P. Castanier, Assistant Research Scientist
Department of Mechanical Engineering, The University of Michigan, 2250 G. G. Brown Building, Ann Arbor, MI 48109-2125
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C. Pierre, Professor, Fellow ASME
C. Pierre, Professor, Fellow ASME
Department of Mechanical Engineering, The University of Michigan, 2250 G. G. Brown Building, Ann Arbor, MI 48109-2125
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R. Bladh, Graduate Student
Department of Mechanical Engineering, The University of Michigan, 2250 G. G. Brown Building, Ann Arbor, MI 48109-2125
M. P. Castanier, Assistant Research Scientist
Department of Mechanical Engineering, The University of Michigan, 2250 G. G. Brown Building, Ann Arbor, MI 48109-2125
e-mail: mpc@umich.edu
C. Pierre, Professor, Fellow ASME
Department of Mechanical Engineering, The University of Michigan, 2250 G. G. Brown Building, Ann Arbor, MI 48109-2125
Contributed by the International Gas Turbine Institute (IGTI) of the 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, New Orleans, LA, June 4–7, 2001; Paper 2001-GT-277. Manuscript received by IGTI, Dec. 2000, final revision Mar. 2001. Associate Editor: R. Natole.
J. Eng. Gas Turbines Power. Jan 2003, 125(1): 121-130 (10 pages)
Published Online: December 27, 2002
Article history
Received:
December 1, 2000
Revised:
March 1, 2001
Online:
December 27, 2002
Citation
Bladh, R., Castanier, M. P., and Pierre, C. (December 27, 2002). "Effects of Multistage Coupling and Disk Flexibility on Mistuned Bladed Disk Dynamics ." ASME. J. Eng. Gas Turbines Power. January 2003; 125(1): 121–130. https://doi.org/10.1115/1.1498267
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