Reference : Two-domain and three-domain limit cycles in a typical aeroelastic system with freepla...
Scientific journals : Article
Engineering, computing & technology : Aerospace & aeronautics engineering
Two-domain and three-domain limit cycles in a typical aeroelastic system with freeplay in pitch
Verstraelen, Edouard mailto [Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux >]
Dimitriadis, Grigorios mailto [Université de Liège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
Dal Ben Rossetto, Gustavo [Embraer > Technology Development Department > > >]
Dowell, Earl H. [Duke University > Mechanical Engineering and Materials Science > > >]
Journal of Fluids and Structures
Academic Press
Yes (verified by ORBi)
United Kingdom
[en] Nonlinear aeroelasticity ; Grazing bifurcation ; Aperiodic solution ; Limit cycle oscillations ; Wind tunnel ; Freeplay
[en] Freeplay is a significant source of nonlinearity in aeroelastic systems and is strictly regulated by airworthiness authorities. It splits the phase plane of such systems into three piecewise linear subdomains. Depending on the location of the freeplay, limit cycle oscillations can result that span either two or three of these subdomains. The purpose of this work is to demonstrate the existence of two-domain cycles both theoretically and experimentally. A simple aeroelastic system with pitch, plunge and control deflection degrees of freedom is investigated in the presence of freeplay in pitch. It is shown that two-domain and three-domain cycles can result from a grazing bifurcation and propagate in the decreasing airspeed direction. Close to the bifurcation, the two limit cycle branches interact with each other and aperiodic oscillations ensue. Equivalent linearization is used to derive the conditions of existence of each type of limit cycle and to predict their amplitudes and frequencies. Comparisons with measurements from wind tunnel experiments demonstrate that the theory describes these phenomena with accuracy.
Interactions Fluide Structure et Aérodynamique Expérimentale
UE - Union Européenne
Researchers ; Professionals
FP7 ; 307265 - NOVIB - The Nonlinear Tuned Vibration Absorber

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