Flutter suppression of a suspension bridge sectional model by the feedback controlled twin-winglet system

Active controlled twin-winglet system is one of the aerodynamic affiliated facilities, which can increase the flutter stability of a suspension bridge. Though much attention has been paid on this method in recent years, most of the studies only focus on theoretical analysis, and few research groups have conduct experiments to validate their control effects. In this paper, we successfully realize the control progress of the twin-winglet system on a bridge sectional model in the wind tunnel, where feedback control tests are carried out to examine a previously proposed theoretical framework. According to the framework, control parameters are determined at the flutter critical wind speed with laminar incoming flow assumption. To check effectiveness and robustness of these theoretical assumptions, we conduct a series of wind tunnel tests under various actual wind speed in both laminar and turbulent inflows. With the efforts above, theoretical basis and application effect of the theoretical framework are verified in a relatively systematical way.