Active suppression of flutter and gust response of bridge using edge control surfaces

The control surfaces at the edge of deck are proposed for flutter suppression and gust alleviation. The state space equation of motion considering the aerodynamic and dynamic interaction between the deck and the control surfaces is derived. The unsteady aerodynamic forces terms are included in the equation of motion using rational function approximation. The derived equation combined with output feedback optimal control theory is adopted. The proposed method can sustain the stability within design wind velocity and reduce gust response as well. Minimum energy control scheme would be applied for flutter problem. Multiple controllers which is operated possibly under malfunction of some controllers is proper to enhance the robustness of active control system.