Abstract
This paper deals with a hydraulic active mass damper (AMD) system with springs between the mass and the structure. This system has been proved to be able to use small-size actuators without degradation of control performance, and a modified system model to apply an optimal control theory is proposed. In this system, effects of cylinder size and spring constant are examined and their design guide is shown. A method is proposed to prevent the AMD from damage and keep the structure safe against large earthquakes compatible with the control performance at small level of oscillations, and its effectiveness is proved by simulations. Some observed data of an AMD system installed on a high-rise building are shown.
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