Abstract
Two controllers for an active dynamic vibration absorber are designed to reduce the vibration to zero at specified frequencies and to non-resonant levels at the others. One of them contains a disturbance observer and asymptotically realizes a feedforward control of disturbance cancellation. It preserves the regulation property independent of perturbations in the primary system, but is sensitive to those in the absorber system. The other incorporates a disturbance model into its feedback loop. It preserves the regulation property in the presence of perturbations in both the primary and absorber systems. The designed controllers are studied experimentally.
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