Abstract
In this paper, a two-dimensional isolation table using circular arc springs and a magnetic damper, which has a simple construction, low height and the capability of vibration isolation in every horizontal direction, is proposed. The isolation table is composed of eight circular arc springs, twelve free bears, a magnetic damper, a table board and a base board. It has approximately the same stiffness and damping coefficient in every direction in the horizontal plane. The response acceleration spectra of the isolation table for two kinds of actual seismic acceleration waves are calculated to confirm the effects of isolation on the seismic responses of the table. A trial isolation table was made and its resisting force characteristics were investigated theoretically and experimentally. The seismic responses and the frequency responses of the table which was installed with a mass or a tall furniture-type model were measured using an electrohydraulic-type vibration machine. The experimental results were compared with the calculated results, and the effects of vibration suppression of the table were confirmed.
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