Abstract
In this paper, conventional analysis and control methods on open- and closed-loop system of disturbance attenuation control in water-wave tank, is extended to consider variation in bottom surface geometry by additionally locating a submerged block. Frequency responses obtained by experiment and analyzed by the boundary element method (BEM) show good agreement in low frequency range, for various changes in block height, width, and position. Specifically, resonant frequencies are almost identical only with 2%error. The resonant frequency is decreased when the block height and width becomes larger. It is shown that the desired performance to attenuate standing-wave oscillation is provided by H_∞ control system design considering bottom shapes. Control experiment shows that sinusoidal disturbance with 1st to 3rd resonant frequencies are attenuated up to 40%, and random disturbance is attenuated up to 30% at 1st to 3rd resonant frequencies.
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