Aeroelasticity; Structural dynamics; Time-varying systems; Linearization; Short Time Fourier Transform
Abstract :
[en] A time-frequency method is proposed for the analysis of response time histories
from nonlinear aeroelastic systems. The approach is based on a time-varying curve-fit of the
Short Time Fourier Transform of the impulse response. It is shown that the method can be
used in order to obtain a clear picture of the sub-critical stability of a number of aeroelastic
systems with a variety of structural and aerodynamic nonlinearities. Additionally, frequency
and amplitude information can be obtained for both the linear and nonlinear signatures of the
response signals in the sub and post-critical regions. Finally, it is shown that, given certain
types of nonlinear functions, subcritical damping trends can be extrapolated to predict
bifurcation airspeeds.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Dimitriadis, Grigorios ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
Cooper, J. E.; University of Manchester > School of Engineering
Language :
English
Title :
A time-frequency technique for the stability analysis of impulse responses from nonlinear aeroelastic systems
Publication date :
June 2001
Event name :
International Forum on Aeroelasticity and Structural Dynamics, IFASD 2001
Event organizer :
CEAS Council of European Aerospace Societies
Event place :
Madrid, Spain
Event date :
du 5 juin 2001 au 7 juin 2001
Audience :
International
Main work title :
Proceedings of the 2001 International Forum on Aeroelasticity and Structural Dynamics
Publisher :
Associacion de Ingenieros Aeronauticos de Espana, Madrid, Spain
