The newly revealed phenomenon of reduction of forced response levels in a mistuned bladed disk to levels significantly (e.g., by a factor of 2 and more) lower than that of its tuned counterpart is studied in detail on an example of a realistic bladed disk. Statistical properties of the amplification factor of the mistuned forced response calculated with aero-effects included have been studied for cases of random blade mistuning and for mistuned blade rearrangements. The optimization search for the best mistuning patterns providing maximum forced response reduction effect have been performed and the robustness of the optimum mistuning patterns has been demonstrated. The combined effect of the aerodynamic and structural damping on the response reduction is assessed. It is shown that the new phenomenon is of major practical significance and has to be taken into account in analysis of the forced response and design decisions.
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July 2011
Research Papers
Reduction of Forced Response Levels for Bladed Disks by Mistuning: Overview of the Phenomenon
E. P. Petrov
E. P. Petrov
Department of Mechanical Engineering, Centre of Vibration Engineering,
e-mail: y.petrov@imperial.ac.uk
Imperial College London
, South Kensington Campus, London, SW7 2AZ, UK
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E. P. Petrov
Department of Mechanical Engineering, Centre of Vibration Engineering,
Imperial College London
, South Kensington Campus, London, SW7 2AZ, UKe-mail: y.petrov@imperial.ac.uk
J. Eng. Gas Turbines Power. Jul 2011, 133(7): 072501 (10 pages)
Published Online: March 10, 2011
Article history
Received:
April 8, 2010
Revised:
April 9, 2010
Online:
March 10, 2011
Published:
March 10, 2011
Citation
Petrov, E. P. (March 10, 2011). "Reduction of Forced Response Levels for Bladed Disks by Mistuning: Overview of the Phenomenon." ASME. J. Eng. Gas Turbines Power. July 2011; 133(7): 072501. https://doi.org/10.1115/1.4002619
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