Localization of energy in a perfectly symmetric bladed disk assembly due to nonlinearities

Georgiades, Fotios and Peeters, Maxime and Kerschen, Gaetan and Golinval, Jean-Claude and Ruzzene, Massimo (2007) Localization of energy in a perfectly symmetric bladed disk assembly due to nonlinearities. ASME Proceedings | Advances in Aerospace Technology, 1 . pp. 229-237. ISSN UNSPECIFIED

Full content URL: http://dx.doi.org/10.1115/IMECE2007-41649

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Abstract

Although a bladed disk is typically designed to have identical blades, manufacturing tolerances, wear,
and other causes may cause random deviations among the blades. The blade-to-blade
discrepancies, denoted as mistuning, lead to vibratory responses mostly concentrated in small
regions of the bladed-disk assembly, according to a phenomenon called localization. The resulting
spatial confinement of the vibration energy causes the responses of some blades to become
dangerously high and increases the amplitude of the bladed-disk assembly's overall response. The
attendant increase in stresses can lead to premature high cycle fatigue (HCF) of the blades. In this study
we investigate whether vibration localization in a perfectly symmetric bladed disk assembly may
occur in the presence of nonlinearity. To this end, the nonlinear normal modes (NNMs) of a simplified
model of a bladed disk assembly are computed. The NNMs are then carefully examined to highlight
possible vibration localization phenomena.

Additional Information:PROCEEDINGS ASME International Mechanical Engineering Congress and Exposition, IMECE2007-41649
Keywords:Localized NNMs, Georgiadis
Subjects:H Engineering > H310 Dynamics
H Engineering > H143 Structural Mechanics
H Engineering > H342 Vibration
H Engineering > H300 Mechanical Engineering
H Engineering > H140 Mechanics
Divisions:College of Science > School of Engineering
ID Code:9496
Deposited On:30 May 2013 10:02

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