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Research Papers

Forced Response Analysis of Integrally Bladed Disks With Friction Ring Dampers

[+] Author and Article Information
Denis Laxalde1

Laboratoire de Tribologie et Dynamique des Systèmes, École Centrale de Lyon, 36 Avenue Guy de Collongue, 69134 Ecully Cedex, Francedenis.laxalde@mcgill.ca

Fabrice Thouverez

Laboratoire de Tribologie et Dynamique des Systèmes, École Centrale de Lyon, 36 Avenue Guy de Collongue, 69134 Ecully Cedex, France

Jean-Pierre Lombard

 Snecma—Safran Group, 77550 Moissy-Cramayel, France

1

Present address: Department of Mechanical Engineering, McGill University, Montreal, QC, Canada.

J. Vib. Acoust 132(1), 011013 (Feb 01, 2010) (9 pages) doi:10.1115/1.4000763 History: Received April 06, 2007; Revised November 18, 2009; Published February 01, 2010; Online February 01, 2010

This paper investigates a damping strategy for integrally bladed disks (blisks) based on the use of friction rings. The steady-state forced response of the blisk with friction rings is derived using the so-called dynamic Lagrangian frequency-time method adapted to cyclic structures with rotating excitations. In addition, an original approach for optimal determination of the number of Fourier harmonics is proposed. In numerical applications, a representative compressor blisk featuring several rings is considered. Each substructure is modeled using finite-elements and a reduced-order modeling technique is used for the blisk. The efficiency of this damping technology is investigated, and friction dissipation phenomena are interpreted with respect to frequency responses. It is shown that the friction damping effectiveness depends mainly on the level of dynamic coupling between blades and disk, and on whether the dynamics features significant alternating stick/slip phases. Through parameter studies, design guidelines are also proposed.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Cross-sectional view of a blisk with possible locations of friction rings

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Figure 2

Computation of the Lagrange multiplier vector

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Figure 3

FE model of a blisk (sector) with details of the contact interface and retained nodes

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Figure 4

Frequency/nodal diameter map of the blisk model

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Figure 5

First torsion mode deformed shapes: (a) two nodal diameters; (b) eight nodal diameters

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Figure 6

Frequency responses for various normal loads (N). Influence of the blade/disk coupling: (a) strong coupling; (b) weak coupling

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Figure 7

Third mode at 4 nodal diameters; second bending mode

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Figure 8

Frequency responses for several (normalized) ring’s thicknesses (D); third mode (2F) at 4 nodal diameters

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Figure 9

Local behavior of the contact interface: ((a) and (b)) normal and tangential relative displacements; ((c) and (d)) normal and tangential (friction) contact forces

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Figure 10

Frequency responses for three types of rings

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Figure 11

Frequency responses with single ring or multiple rings; influence of excitation force level (F); Third mode (2F) at 4 nodal diameters

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