Transonic buffeting control via a nonlinear aeroservoelastic model of reduced-order

Abstract The paper presents a detailed study on the transonic buffeting phenomenon and related active control problems via a novel nonlinear aeroservoelastic model of reduced-order. An important feature of the study is the reconstruction of the unsteady aerodynamics in transonic buffeting flows via a modified nonlinear state-space identification scheme. Based on the aerodynamic model reduction, the paper gives a nonlinear aeroservoelastic model of reduced-order by coupling the structural dynamics of a wing section with a control surface. To demonstrate the accuracy and efficiency of the above model and the control design for transonic buffeting, the study deals with detailed numerical simulations of a wing section of an NACA0012 aerofoil system with a control surface. The case studies cover the dynamic behaviours of such an aerofoil system, including flutter, limit-cycle oscillations, nodal-shaped oscillations and open/closed-loop aeroservoelastic buffeting oscillations. The numerical results demonstrate that the novel nonlinear reduced-order modeling approach provides an efficient way to synthesise the active buffeting control system. Based on the nonlinear aeroservoelastic model of reduced-order, the control gains of the buffeting controller can be efficiently determined and the unstable buffeting behaviours can also be controlled effectively.