The focus of this paper is active vibration control with application to cable-stayed bridges. Hybrid vibration control, involving the combined use of feedforward and feedback action, is applied to a prototype cable-stayed bridge. The control objective is to reject all disturbances that produce unwanted motion in the bridge structure, namely seismic activity, wave loading and wind loading. A 1/150 scale model of a cable-stayed bridge is designed and fabricated from steel, aluminum, and steel wire and compared to an existing structure using experimental modal analysis. A three-dimensional finite element model of the bridge is developed for verification purposes. The frequency range of interest for the structural active vibration control problem is determined, A method for placing sensors and actuators on the structure is developed using operational vibration data within the frequency range of interest. An adaptive, combined feedforward and feedback control system is implemented on the structure.

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