Control of a pneumatic anti-vibration apparatus under long-period earthquake ground motion using SI value

This paper considers control of a pneumatic anti-vibration apparatus under long-period earthquake ground motion. To suppress effects of the earthquake, floor vibration feedforward and acceleration feedback controls are automatically stopped based on any floor vibration displacement. Next, to detect the long-period earthquake ground motion, this paper considers SI (Spectral Intensity) value. Performance of proposed method is evaluated by simulations using measured seismic waveforms.