Abstract
This paper studies the disturbance cancellation control to suppress a vortex-induced vibration of a circular cylinder in a cross flow. The controller consists of the optimal regulator and the feedforward control. The external force by the vortex shedding is assumed as a harmonic force, and the magnitude of disturbance is estimated by the minimal order observer for the feedforward control. The cylinder is supported by an elastic beam, and piezoelectric actuators are used as control devices.
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