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Technical Briefs

Prediction of Vibration Response Levels of Mistuned Integral Bladed Disks (Blisks): Robustness Studies

[+] Author and Article Information
Y.-J. Chan1

Department of Mechanical Engineering, Imperial College London, South Kensington, London SW7 2AZ, UKchanyj@graduate.hku.hk

D. J. Ewins

Department of Mechanical Engineering, Imperial College London, South Kensington, London SW7 2AZ, UKd.ewins@imperial.ac.uk

1

Corresponding author.

J. Turbomach 134(4), 044501 (Jul 19, 2011) (7 pages) doi:10.1115/1.4003646 History: Received December 10, 2009; Revised November 09, 2010; Published July 19, 2011; Online July 19, 2011

Integral bladed disks (also known as blisks) are more widely used in modern aeroengine compressor designs because of the potential weight savings, but there are challenges in controlling the extreme vibration response levels in mistuned blisks, which are blisks with blades slightly different from each other. As blisks lack the uncertainty and variability of friction properties related to joints, the maximum vibration response level of a blisk test piece in operation can be predicted prior to installation. A previously proposed response-level prediction procedure for mistuned blisks is outlined, and its robustness is studied. A method of improving the results, given noisy experimental data, is proposed. Some of the issues discussed are validated by using experimental data.

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References

Figures

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Figure 2

Predicting the amplification factor of a mistuned blisk

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Figure 1

Amplification factors before and after crack growth

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Figure 10

Comparison between identified mistuning patterns and the targeted pattern

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Figure 3

Measurement and excitation points in simulations

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Figure 4

Receptance FRFs under various excitation points

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Figure 5

Modal constants of a point receptance FRF

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Figure 6

Improved response-prediction procedure

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Figure 7

Distribution parameters of identified frequency mistuning patterns using noisy modes

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Figure 8

Distribution parameters of identified damping mistuning patterns using noisy modes

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Figure 9

Experimental setup

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Figure 11

MAC function between identified modes and selected reconstructed modes. Modes are arranged in an ascending order of their corresponding natural frequencies.

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