Forced Response Analysis of a Mistuned Blisk Using Noncyclic Reduced-Order Models

The importance of mistuning analysis lies on understanding the distribution of the vibrational energy around the blisk. The large vibration amplitudes of individual blades inherent in mistuned blisks reduces the high cycle fatigue margin significantly. It is therefore important to perform mistuning...

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Bibliographic Details
Published in:Journal of propulsion and power 2018-05, Vol.34 (3), p.565-577
Main Authors: Gutierrez Salas, Mauricio, Petrie-Repar, Paul, Mårtensson, Hans, Bladh, Ronnie, Vogt, Damian M
Format: Article
Language:English
Subjects:
Accuracy
aeroelasticity
Aerospace Engineering
Blisks
Computing costs
Cost analysis
craig-bampton
craig-chang
cyclic symmetry
Energy distribution
fixed-interface
flutter
Flyg- och rymdteknik
forced response
free-interface
High cycle fatigue
Mistuning (turbomachinery)
noncyclic
Reduced order models
reduction subset nominal mode
ROM
snm
Substructures
transformation
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Summary:The importance of mistuning analysis lies on understanding the distribution of the vibrational energy around the blisk. The large vibration amplitudes of individual blades inherent in mistuned blisks reduces the high cycle fatigue margin significantly. It is therefore important to perform mistuning analyses at a high accuracy while keeping the computational cost at an acceptable level. Because numerous analyses with large amount of degrees of freedom models are commonly performed, it is frequent to employ reduced-order models such as to reduce the computational effort. In this paper, a unique way to address the reduced-order model is presented, where each blisk sector is attached as individual substructures with the free-interface approach known as Craig–Chang. This implementation is compared against a fixed-interface approach known as Craig–Bampton in terms of accuracy for disk- and blade-dominated modes. Neither of these approaches applies cyclic symmetry, making them more accurate in the presence of mistuning when the harmonic patterns are destroyed. Results show the high benefits of using the free-interface approach for a mistuned forced response analysis.
ISSN:0748-4658
1533-3876
1533-3876
DOI:10.2514/1.B36584