Design of Energy-Regeneration Seismic Isolation Device Considering Frequency Band of Ground Motion and Motor Characteristic

Abstract

During and after big earthquakes power outage often occurs, thus it is difficult to keep continuing energy supply. In this study by using energy regeneration, an active seismic isolation device having a charging function is proposed. First, rotational velocity - electromotive force characteristics of motors during actuation and regeneration is modeled based on the experimental data. Second, artificial long-period ground motions for design are created by using acceleration data of ground motions. Then, design variables of the seismic isolation device which focus is on the charging function are optimized using a genetic algorithm. By numerical simulation, it is confirmed that the proposed energy-regeneration active seismic isolation device shows response reduction and regeneration effect as required against both long-period and short-period ground motions.