A structural response control system by installing active rotor fins (which are named "active fins") is proposed for reducing wind-induced building vibrations. The active fin system is manipulated to control the "wind forces' acting on the fin according to the structural responses. Through wind tunnel tests, aerodynamical wind force effects acting on rotating fin under transitional state are evaluated to relate the wind conditions into the control algorithm. In this paper, very simple and reasonable control algorithm of the active fin system is proposed and investigated. As a result, it is assured that effective wind-resistant response control can be operated by using the active fin system.
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