A reduced-order-model-based multiple-in multiple-out gust alleviation control law design method in transonic flow

Gust alleviation is very important to a large flexible aircraft. A nonlinear low-order aerodynamic state space model is required to model the nonlinear aeroelastic responses due to gust. Based on the proper orthogonal decomposition method, a reduced or- der modeling of gust loads was proposed. And then the open-loop and closed-loop reduced order state space model for the transonic aeroelastic system was developed. The static output feed back control scheme was used to design a simple multi- ple-in multiple-out （MIMO） gust alleviation control law. The control law was demonstrated with the Goland＋ wing model with four control surfaces. The simulation results of different discrete gusts show the capability and good performance of the de- signed MIMO controller in transonic gust alleviation.