Abstract
The active seismic isolation system and the active seismic vibration control system have now been getting attention because of the recent big earthquake disasters. In conventional active isolation devices, the actuators are usually controlled by commands which are generated by the computer based on sensor input. Although these systems have such advantages that a control program can be designed freely, the maintenance of the computer itself and software leaves serious problems to be solved when they are outdated. In this study, a novel seismic control apparatus, in which hydraulic spool valves are controlled by mechanical links directly driven by earthquake motion, is proposed to solve this problem.
