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Research Papers

Integer Frequency Veering of Mistuned Blade Integrated Disks

[+] Author and Article Information
T. Klauke

e-mail: thomas.klauke@rolls-royce.com

U. Strehlau

e-mail: ulrik.strehlau@vattenfall.de

A. Kühhorn

e-mail: kuehhorn@tu-cottbus.de
Chair of Structural Mechanics and
Vehicle Vibration Technology
BTU Cottbus,
Siemens-Halske-Ring 14,
03044 Cottbus, Germany

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received June 14, 2010; final manuscript received February 13, 2013; published online September 13, 2013. Assoc. Editor: Matthew Montgomery.

J. Turbomach 135(6), 061004 (Sep 13, 2013) (7 pages) Paper No: TURBO-10-1055; doi: 10.1115/1.4024022 History: Received June 14, 2010; Revised February 13, 2013

As a result of more balanced blade aspect ratios of modern blade-integrated disks (blisks), interactions between disk-dominated and blade-dominated modes are becoming more and more important, especially if blade mistuning is considered. The specific vibration behavior in these transition regions is characterized by a mix of both fundamental mode types into “coupled” modes. In this paper, numerical and experimental investigations based on a front high-pressure compressor (HPC) blisk stage were carried out in order to determine the effect of blade mistuning on those regions in detail. At this, effects like mode localization and amplitude magnification are found to be weakened in an integer frequency-veering zone. Contrary to this, blisks are very sensitive to mistuning in regions of pure blade-dominated mode families with high modal density.

Copyright © 2013 by ASME
Topics: Disks , Blades
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Figures

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Fig. 2

Full assembly model and meshed sector model of front HPC blisk

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Fig. 3

Nodal diameter map; modes colored by type

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Fig. 1

Disk and blade deflection for different blisk vibration modes

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Fig. 4

Difference in the eigenfrequencies of adjacent mode families; normalized to CSM 4

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Fig. 5

Experimental setup

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Fig. 6

Experimental-determined blade-alone frequency mistuning distribution around blisk circumference

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Fig. 7

Mean normalized frequency response function of all blades between first torsion and tramline mode

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Fig. 8

Mean FRF of first torsion modes (top); displacements at blade tip/leading edge around circumference with corresponding localization factor, mode fill factor, and including Fourier components of two torsion modes (bottom)

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Fig. 9

Mean FRF of frequency veering 1 modes (top); displacements at blade tip/leading edge around circumference with corresponding localization factor, mode fill factor, and including Fourier components of two frequency-veering 1 modes (bottom)

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Fig. 12

Nodal diameter map, including resulting localization factor due to blade mistuning

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Fig. 13

Nodal diameter map, including resulting mode-filling factor due to blade mistuning

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Fig. 14

Nodal diameter map, including resulting displacement amplitude magnification factor

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Fig. 15

Nodal diameter map, including resulting stress amplitude magnification factor

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Fig. 16

Resulting stress amplitude magnification factor versus displacement magnification factor of mistuned blisk

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Fig. 17

Localization factor and blade displacement magnifications depending on mistuning level; first torsion modes, EO 4 excitation, scaled measured mistuning distribution applied

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Fig. 10

Nodal diameter map of E3E-R1, including blade strain energy ratio compared to total blisk strain energy

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Fig. 11

Nodal diameter map of E3E-R1, including PMAC

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