Abstract
This paper proposes active control system based on feedback control and an wave generating actuator with a vertical-vibrating plate, in order to attenuate standing-wave oscillation by unkown disturbance contamination in water wave tank. The validity of the system is examined by control experiments. The water wave tank is about 0.9 m in length, and has two actuators symmetrically located in the tank (one for disturbance generation and one for attenuation control) and two water-level sensors (one for control measurement and one for performance evaluation). First, the plant model is identified based on frequency response experiments, and the validity of the model is shown by a numerical analysis with the boundary element method. Secondly, the feedback controller is systematically designed by H∞ control synthesis so that the robust stability is guaranteed against plant uncertainty, and the validity of the system is shown based on the symmetry locations of actuators. Finally, control experiments are examined by using sinusoidal and random signals as unknown disturbance. It has been shown that the frequency components of resonance from the 1st to 4th modes are reduced by 20%～60%,which shows the desired performance of the proposed system to attenuate standing-wave oscillation.
