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Research Papers: Gas Turbines: Structures and Dynamics

Experimental and Numerical Investigation of Rotating Bladed Disk Forced Response Using Underplatform Friction Dampers

[+] Author and Article Information
Ibrahim A. Sever

 Rolls-Royce plc, P.O. Box 31, Derby DE24 8BJ UKibrahim.sever@rolls-royce.com

Evgeny P. Petrov

Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UKy.petrov@imperial.ac.uk

David J. Ewins

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

J. Eng. Gas Turbines Power 130(4), 042503 (Apr 29, 2008) (11 pages) doi:10.1115/1.2903845 History: Received July 30, 2007; Revised July 30, 2007; Published April 29, 2008

In this paper, we present a methodology and results from an experimental investigation of forced vibration response for a bladed disk with fitted underplatform “cottage-roof” friction dampers, together with the corresponding numerical predictions. A carefully designed and constructed rotating test rig is used to make precise measurements, which involve only the phenomena of interest. For this purpose, the measurement rig is operated under vacuum to eliminate aerodynamic effects on the rotating blisk and noncontact excitation and measurement techniques are employed so as not to modify the bladed disk dynamics. The experimental data measured are used for validation of multiharmonic balance-based prediction tools developed at the Imperial College. Predictions are carried out both with and without taking inherent mechanical mistuning into account, which is identified from measured data. Measured and predicted response curves are compared with each other and the degree of correlation is discussed.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 3

(a) Simple FE model used in the damper design; (b) free body diagram of a damper

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Figure 4

Comparison of two blade responses to nine EO excitation. —Measured; - - predicted.

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Figure 5

Blisk response with fitted Ti CR damper

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Figure 6

Undamped response of Blade 1 to (a) 19 EO and (b) 17 EO excitations

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Figure 7

(a) Response of all Blades and (b) maximum amplitude variation to 19 EO excitations

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Figure 8

Blade 1 tip response–19 EO/5 ND resonance (inset top) and damper surface after shutting down (inset bottom)

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Figure 9

(a) Response of Blade 1 to 19 EO excitations for all installations, and time histories at 884rpm for (b) Installation 1 and (c) Installation 4

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Figure 10

(a) Variation of force signal amplitude with rotational speed, and (b) response of Blade 1 to 20 EO excitations at various blade-magnet gaps

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Figure 11

Modeling of friction dampers and introduction of mistuning (inset)

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Figure 12

Comparison of measured and computed damped response in Blade 1: 19 EOs, μ=0.45

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Figure 13

Measured and computed damped response in Blade 1: (a) for 18 EO and (b) for 17 EO excitations (μ=0.45)

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Figure 14

Measured and computed damped response in Blade 1: (a) for 18 EO and (b) for 19 EO excitations (μ=0.6)

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Figure 1

Manufactured blisk (a) and its cyclic-sector FE model used to calculate the 1F family natural frequencies (b)

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Figure 2

Test rig and measurement system

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