Active flutter control of transonic flapped wing based on CFD/CSD coupling

Transonic unsteady aerodynamics model can be obtained by CFD/CSD coupling computation, but it is disadvantaged to analyze and integrate ASE problems because of the high order of model. The high order ASE model is dealt with order reduction technique using system differentiate and analyses and balanced truncation in this paper, and integrate with the low order model. Outlines of this paper can be generalized as follow: 1) the unsteady aerodynamics reduced-order model (ROM) is gained by applying Volterra series theory, and the aeroservoelasticity (ASE) model is gained by coupling configuration dynamics and servo dynamics; 2) a lower ASE reduced-order model is obtained using the balanced truncation method; 3) based on ASE reduced-order model a mixed sensitivity H_infin controller is designed for flutter suppression. At last, in a typical BACT system, simulations of model reduction and active flutter suppression controller designing are given. The result shows that the ASE reduced-order model based on ROM can reflect flutter characteristic of practical system factually, and it has lower order than CFD/CSD coupling model, while the low-order robust controller designed based on balanced truncated ASE model can apply to practical system effectually, and increased the flutter speed by 36%.