0
Research Papers: Gas Turbines: Structures and Dynamics

Reduction of Forced Response Levels for Bladed Disks by Mistuning: Overview of the Phenomenon

[+] Author and Article Information
E. P. Petrov

Department of Mechanical Engineering, Centre of Vibration Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UKy.petrov@imperial.ac.uk

J. Eng. Gas Turbines Power 133(7), 072501 (Mar 10, 2011) (10 pages) doi:10.1115/1.4002619 History: Received April 08, 2010; Revised April 09, 2010; Published March 10, 2011; Online March 10, 2011

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.

Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Resonance frequency shifts and modal damping factors from action of the aerodynamic forces

Grahic Jump Location
Figure 2

Natural frequencies of the tuned blisk and frequency ranges of interest

Grahic Jump Location
Figure 3

Coefficients of the mistuned forced response expansion over tuned blisk mode +3EO: (a) 1%, (b) 5%, and (c) 10% mistuning ranges

Grahic Jump Location
Figure 4

Energy dissipated by +3EO modes and by all the other modes: a case of +3EO excitation

Grahic Jump Location
Figure 5

Dependency of the amplification factor on the mistuning range

Grahic Jump Location
Figure 6

Probability density for the amplification factors: a case of +3EO

Grahic Jump Location
Figure 7

Probability density for the amplification factors: a case of −3EO

Grahic Jump Location
Figure 8

Probability density for the amplification factors: a case of +15EO

Grahic Jump Location
Figure 9

Probability density for the amplification factors: a case of −15EO

Grahic Jump Location
Figure 10

Probability density for the amplification factors: +3EO

Grahic Jump Location
Figure 11

Probability density for the amplification factors: −3EO

Grahic Jump Location
Figure 12

Probability density for the amplification factors: +15EO

Grahic Jump Location
Figure 13

Probability density for the amplification factors: −15EO

Grahic Jump Location
Figure 14

Amplification factors for worst and best mistuning patterns found by the optimization search: a case of +3EO excitation

Grahic Jump Location
Figure 15

Mistuning pattern providing minimum amplification factor values: a case of +3EO excitation

Grahic Jump Location
Figure 16

Amplification factor variations in the vicinity of the optimum mistuning pattern: a case of +3EO

Grahic Jump Location
Figure 17

Effect of random perturbations around the optimum mistuning pattern on the forced response level

Grahic Jump Location
Figure 18

Statistical characteristics of the amplification factors calculated for random perturbations around the optimum mistuning pattern

Grahic Jump Location
Figure 19

Dependency of the amplification factor on the structural damping and the mistuning range: a case of +3EO

Grahic Jump Location
Figure 20

Dependency of the amplification factor on the structural damping and the mistuning range: a case of −3EO

Grahic Jump Location
Figure 21

Dependency of the amplification factor on the structural damping and the mistuning range: a case of +15EO

Grahic Jump Location
Figure 22

Dependency of the amplification factor on the structural damping and the mistuning range: a case of −15EO

Grahic Jump Location
Figure 23

Dependency of the amplification factor on the structural damping: (a) a case of 3EO and (b) a case of 15EO

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In