Active Flutter Suppression of a Wind Tunnel Multiple-Actuated-Wing Model

Abstract In this study, a Multi-Input/Multi-Output (MIMO) time-delay feedback controller was designed to actively sup-press the flutter instability of a wind tunnel model of Multiple-Actuated-Wing (MAW) in the low subsonic flow re-gime. The unsteady aerodynamic forces of the MAW model were computed based on the doublet-lattice method (DLM). As the first attempt, the conventional LQG controller was designed to actively suppress the flutter of the MAW model. However, because of the time delay in the control loop, the wind tunnel test illustrated that the LQG-controlled MAW model had no guaranteed stability margins. To compensate the time delay, hence, a time-delay filter, approximated via the first-order Pade approximation, was added to the LQG controller. Based on the time-delay feedback controller, a new digital control system was constructed by using a fixed-point and embed-ded Digital Signal Processor (DSP) of high performance. Then, a number of wind tunnel tests were implemented based on the digital control system. The experimental results showed that the present time-delay feedback controller could expand the flutter boundary of the MAW model and suppress the flutter instability of the open-loop aeroelastic system effectively.

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