AEROSERVOELASTIC ANALYSIS AND ROBUST CONTROLLER SYNTHESIS by ALPER AKMEŞE

By ALPER AKMEŞE

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Laurenson et al. [31] used a rigid airfoil with the steady subsonic aerodynamics, Yehezkely et al. [30] used an elastic airfoil with the unsteady supersonic aerodynamics via piston theory. Özbay [42] used the thin airfoil assumption with the unsteady incompressible aerodynamics in his study on the robust controller synthesis for flutter suppression of an airplane wing. On the other hand, Lind and Brenner [45, 46 , 47 ] used doublet lattice and other panel methods, with the unsteady subsonic and supersonic aerodynamics in their robust control studies.

This method was applied by Vipperman et al. [26] in 1999 to an airplane wing model. On the other hand, it is also possible to define uncertainties for flight parameters and a robust controller can be synthesized considering these uncertainties. Waszak [27] performed a similar study. In that study, the uncertainty of the aeroelastic system was derived by applying a disturbance to the dynamic pressure. At the controller synthesis step, the aeroelastic system uncertainty was included, hence the disturbance to dynamic pressure was included indirectly.

History of Aeroelasticity and Aeroservoelasticity In this Section, the history of the aeroelasticity and the aeroservoelasticity is presented based on the studies of Fung [1], Bisplinghoff et al. [2, 3], Garic [4, 5, 6], and Felt et al. [7] . The history of aeroelasticity is older than human history. Because, the aeroelasticity is not confined to manmade structures. Aeroelastic phenomena are also observed in biomechanics, on the wing of birds, in plants, etc. Human race must have been faced with aeroelastic problems as they improved their tools and goods, and they may have solved the problems empirically.

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