ORBi: Dimitriadis Grigorios - A time-frequency technique for the stability analysis of impulse responses from nonlinear aeroelastic systems

Reference : A time-frequency technique for the stability analysis of impulse responses from nonlinea...


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Aerospace & aeronautics engineering
	To cite this reference:	http://hdl.handle.net/2268/25508

Title :	A time-frequency technique for the stability analysis of impulse responses from nonlinear aeroelastic systems
Language :	English
Author, co-author :	Dimitriadis, Grigorios [Université de Liège - ULg > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
	Cooper, J. E. [University of Manchester > School of Engineering > > >]
Publication date :	Jun-2001
Main document title :	Proceedings of the 2001 International Forum on Aeroelasticity and Structural Dynamics
Publisher :	Associacion de Ingenieros Aeronauticos de Espana
Pages :	237-248
On invitation :	No
Audience :	International
ISBN :	84-931375-7-X
City :	Madrid
Country :	Spain
Event name :	International Forum on Aeroelasticity and Structural Dynamics, IFASD 2001
Event date :	du 5 juin 2001 au 7 juin 2001
Event organizer :	CEAS Council of European Aerospace Societies
Event place (city) :	Madrid
Event country :	Spain
Keywords :	[en] 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.
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/25508

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