The following paper presents a reduced-order-modeling approach for nonlinear aerodynamic systems utilizing a pruned Volterra series. The method is applied to a two-dimensional transonic airfoil undergoing forced pitch oscillations. Pruned Volterra series reduced-order-models up to fourth-order are identified and compared against computational fluid dynamics models. Very favorable accuracies are attained over a wide range of Mach number, reduced frequency and oscillation amplitude. The computational resources associated with the pruned Volterra series are demonstrated to be several orders-of-magnitude lower compared to the standard Volterra series. Copyright

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Conference 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Balajewicz, M. (Maciej), Nitzsche, F, & Feszty, D. (2009). Reduced order modeling of nonlinear transonic aerodynamics using a pruned volterra series. In Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference.