Reference : Characterization of the Behaviour of a Simple Aeroservoelastic System with Control No...
Scientific journals : Article
Engineering, computing & technology : Aerospace & aeronautics engineering
Characterization of the Behaviour of a Simple Aeroservoelastic System with Control Nonlinearities
Dimitriadis, Grigorios mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Intéractions fluide structure et aérodynamique expérimentale >]
Cooper, Jonathan E [University of Manchester > School of Engineering > > >]
Journal of Fluids & Structures
Academic Press
Yes (verified by ORBi)
United Kingdom
[en] Aeroservoelasticity ; Control Nonlinearities
[en] The characterization of the behaviour of nonlinear aeroelastic systems has become a very important research topic in the Aerospace Industry. However, most work carried to-date has concentrated upon systems containing structural or aerodynamic nonlinearities. The purpose of this paper is to study the stability of a simple aeroservoelastic system with nonlinearities in the control system and power control unit. The work considers both structural and control law nonlinearities and assesses the stability of the system response using bifurcation diagrams. It is shown that simple feedback systems designed to increase the stability of the linearized system also stabilize the nonlinear system, although their effects can be less pronounced. Additionally, a nonlinear control law designed to limit the control surface pitch response was found to increase the flutter speed considerably by forcing the system to undergo limit cycle oscillations instead of fluttering. Finally, friction was found to affect the damping of the system but not its stability, as long as the amplitude of the frictional force is low enough not to cause stoppages in the motion.
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03 Journal of Fluids and Structures, Vol 14, No 8, 2000.pdfPublisher postprint286.47 kBRequest copy

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