Abstract
Based on the Theodorsen’s Theory of the aerodynamic forces on wing-aileron, the Scanlan’s Theory is expanded considering a deck-flap system. It is suggested that a new forced vibration method can acquire aerodynamic derivatives of this deck-flap system theoretically. After obtaining the wind induced forces, a deck-flap equation of motion in time domain is established to investigate its control law. Numerical simulation results indicate suboptimal control law of the deck-flap system can suppress the flutter effectively, and the flutter speed can be increased for desirable purpose.
Highlights
Flutter is a self-excited motion, which eventually leads to catastrophic damage in bridge structures
Numerical simulation results indicate suboptimal control law of the deck-flap system can suppress the flutter effectively, and the flutter speed can be increased for desirable purpose
Combined with aerodynamic derivatives acquired from forced vibration method, each coefficient can be obtained through the rational function approximation
Summary
Flutter is a self-excited motion, which eventually leads to catastrophic damage in bridge structures. Adding stiffness of a girder, application of mechanical dampers are common ways to improve a bridge aerodynamic property. Using active control is a new way to solve these problems. Some researchers tried to put flaps away from deck in order to omit interference of aerodynamic forces between deck and flaps and can apply Theodorsen’s Theory of aerodynamic forces [1]. This interference cannot be omitted and can improve aerodynamic property in a way [2] [3]. The active control system composes of a deck and flaps symmetrically mounted adjacent to the deck. A numerical simulation helps to investigate its control law
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