Abstract
This paper investigates disturbance cancellation control to suppress vortex-induced vibration of a circular cylinder in a cross flow. The controller consists of an optimal regulator and a feedforward control. The external force of the vortex shedding is assumed to be a harmonic force, and the magnitude of the disturbance is estimated by a minimal-order observer for the feedforward control. The cylinder is supported by two pairs of elastic beams, and electro-magnets are used as control devices. Experiments have shown that the present method is effective in reducing the vibration amplitude of circular cylinders. We investigate the effect of frequency error in the observer on disturbance cancellation control.
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