Effects of Damping and Varying Contact Area at Blade-Disk Joints in Forced Response Analysis of Bladed Disk Assemblies

[+] Author and Article Information
E. P. Petrov, D. J. Ewins

 Centre of Vibration Engineering, Mechanical Engineering Department, Imperial College London, South Kensington Campus, London SW7 2AZ, UK

J. Turbomach 128(2), 403-410 (Sep 28, 2005) (8 pages) doi:10.1115/1.2181998 History: Received August 25, 2005; Revised September 28, 2005

An approach is developed to analyze the multiharmonic forced response of large-scale finite element models of bladed disks taking account of the nonlinear forces acting at the contact interfaces of blade roots. Area contact interaction is modeled by area friction contact elements which allow for friction stresses under variable normal load, unilateral contacts, clearances, and interferences. Examples of application of the new approach to the analysis of root damping and forced response levels are given and numerical investigations of effects of contact conditions at root joints and excitation levels are explored for practical bladed disks.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Bladed disk models: (a) a bladed disk sector; (b) master nodes of the reduced model at blade contact surfaces; (c) master nodes at disk contact surfaces; and (d) an area contact element

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Figure 2

Model (a), natural frequencies of the bladed disk with different contact conditions and frequency range of interest (b)

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Figure 3

Forces response of the bladed disk with stuck contact surfaces modeled by different number of the area contact elements

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Figure 4

Errors in prediction of the resonance characteristics for different number of the area contact elements: (a) For resonance frequencies and (b) for resonance amplitudes

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Figure 8

Effects of the excitation level on the forced response in frequency range of 1F mode: (a) Displacement; and (b) displacement normalized by the excitation level

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Figure 5

The forced response levels for different levels of the static normal stresses and different numbers of the friction area elements applied at the contact surfaces

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Figure 6

Effects of different levels of the static normal stresses: (a) Forced response; and (b) contact area where slip occurs

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Figure 7

Harmonic components for the multiharmonic forced response (calculated for the case of 50% of the normal stress level)

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Figure 9

Effects of the excitation level on the forced response in frequency range of 1T mode: (a) Displacement; and (b) displacement normalised by the excitation level

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Figure 10

Effects of the excitation level on the resonance displacement

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Figure 11

Effects of the excitation level on the slipping area at resonance frequency

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Figure 12

Dependency of the Q-factor on the excitation level



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