Flutter and limit cycle oscillation suppression using linear and nonlinear tuned vibration absorbers

[en] Aircraft are more than ever pushed to their limits for performance reasons. Consequently, they become increasingly nonlinear and they are more prone to undergo aeroelastic limit cycle oscillations. Structural nonlinearities affect aircraft such as the F-16, which can undergo store-induced limit cycle oscillations (LCOs). Furthermore, transonic buzz can lead to LCOs because of moving shock waves in transonic flight conditions on many aircraft. This study presents a numerical investigation of passive LCO suppression on a typical aeroelastic system with pitch and plunge degrees of freedom and a hardening stiffness nonlinearity. The absorber used is made of a piezoelectric patch glued to the plunge springs and connected to a resistor and an inductance forming a RLC circuit. A mechanical tuned mass damper absorber of similar configuration is also considered. The piezoelectric absorber features significant advantages in terms of size, weight and tuning convenience. The results show that both types of absorber increase the linear flutter speed of the system in a similar fashion but, when optimal, they lead to a sub-critical bifurcation while a super-critical bifurcation was observed without absorber. Finally, it is shown that the addition of a properly tuned nonlinear spring (mechanical absorber) or capacitor (piezo- electric absorber) can restore the super-criticality of the bifurcation. The tuning of the nonlinearity is carried out using numerical continuation.

Disciplines :

Aerospace & aeronautics engineering

Author, co-author :

Verstraelen, Edouard ; Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux

Kerschen, Gaëtan ; Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux

Dimitriadis, Grigorios ; Université de Liège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale

Language :

English

Title :

Flutter and limit cycle oscillation suppression using linear and nonlinear tuned vibration absorbers

Publication date :

February 2017

Event name :

Conférence IMAC XXXV

Event organizer :

Society for Experimental Mechanics (SEM)

Event place :

Garden Grove, United States

Event date :

30/1/2017 - 2/2/2017

Audience :

International

Main work title :

Proceedings of the SEM IMAC XXXV

European Projects :

FP7 - 307265 - NOVIB - The Nonlinear Tuned Vibration Absorber

Name of the research project :

The nonlinear tuned vibration absorber (NoVib 307265)

Funders :

UE - Union Européenne [BE]
CE - Commission Européenne [BE]

Available on ORBi :

since 03 March 2017

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