Flutter Suppression of Bridge Deck Section With Controllable Winglets Using Output Feedback Available to Purchase

Control of wind induced flutter of a bridge deck is studied using static output feedback. Servomotor actuated winglets provide the control forces. Deck and winglets are modeled as flat plates and their aerodynamic interaction is neglected. Self excited wind forces acting on deck and winglets are modeled using the Scanlan-Tomko model, with flat plate flutter derivatives obtained from Theodorsen functions. Rogers rational function approximation is used for time domain representation of wind forces in order to simplify the stability and control analyses. Control input to servomotors is based on direct feedback of vertical and torsional displacements of deck. Feedback gains that are constant, or varying with wind speed, are considered. Winglet rotations being restricted, flutter and divergence behavior is studied using system eigenvalues as well as responses. Results show that variable gain output feedback control provides the maximum increase in critical speed and also response attenuation, followed by control with gain scheduling. Control with constant gain is least effective.