Application of an iterative identification and control design to a vibration system

This paper deals with a vibration control experiment using an iterative ide ntification and control design method. The purpose of this investigation is to suppress the natural vibrations of structures. The experimental device has three links behaves as a vibration system. The feature of this device i s that the control system is not sensor/actuator collocated for practical u se of an air jet actuator. In order to suppress natural vibrations, LQG con trol and H-2 control are applied to the model, which is identified iterativ ely on the basis of the closed-loop experimental input/output data. The ach ieved performance is improved, moreover, by a change for the better of the designed control performance in each iteration. In control experiments, ini tial displacement responses and resonance signal responses are examined. It is shown that the iterative design method is useful to design vibration co ntrolled systems and can perform better on suppressing the natural vibratio ns and disturbances than non-iterative design methods.