0
TECHNICAL PAPERS

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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
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

Grahic Jump Location
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

Grahic Jump Location
Figure 3

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

Grahic Jump Location
Figure 2

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

Grahic Jump Location
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

Grahic Jump Location
Figure 6

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

Grahic Jump Location
Figure 7

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

Grahic Jump Location
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

Grahic Jump Location
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

Grahic Jump Location
Figure 10

Effects of the excitation level on the resonance displacement

Grahic Jump Location
Figure 11

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

Grahic Jump Location
Figure 12

Dependency of the Q-factor on the excitation level

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In