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LOCALIZATION OF ENERGY IN A PERFECTLY SYMMETRIC BLADED DISK ASSEMBLY DUE TO NONLINEARITIES
Georgiades, Fotios; Peeters, Maxime; Kerschen, Gaëtan et al.
2007In ASME Internaional Mechanical Engineering Congress and Exposition, Seattle, 2007
Peer reviewed
 

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Keywords :
Localization phenomena; nonlinear normal modes; vibrational energy; BLADED DISK ASSEMBLY
Abstract :
[en] 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.
Disciplines :
Physics
Mechanical engineering
Mathematics
Author, co-author :
Georgiades, Fotios;  University of Liege > Aerospace and Mech. Eng. Dept. LTAS-Vibration and Identification Group
Peeters, Maxime ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
Kerschen, Gaëtan  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Golinval, Jean-Claude  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
Ruzzenne, M.;  Georgia Institute of Technology Atlanta, Georgia > School of Aerospace Engineering
Language :
English
Title :
LOCALIZATION OF ENERGY IN A PERFECTLY SYMMETRIC BLADED DISK ASSEMBLY DUE TO NONLINEARITIES
Publication date :
November 2007
Event name :
ASME Internaional Mechanical Engineering Congress and Exposition
Event organizer :
ASME 2007
Event place :
Seattle, Washington, United States
Event date :
November 11-15, 2007
Audience :
International
Main work title :
ASME Internaional Mechanical Engineering Congress and Exposition, Seattle, 2007
Peer reviewed :
Peer reviewed
Available on ORBi :
since 10 August 2009

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