Study on an isolated table using circular arc beams. Case in which beams are rigidly connected to a table board.

Ohmata, Kenichiro; Yamamoto, H.

doi:10.2493/jjspe.56.2249

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“…from earthquakes or mechanical vibrations (1)- (4) . In previous papers, the authors proposed horizontal isolation tables using circular arc springs and magnetic damping (5) (6) , and those using an X-Y table and wire rope isolators or spiral springs (7) (8) . Among our isolation tables, those using circular arc springs have the advantage of being simple in construction and of low cost, however they have the disadvantage of being tall because they use the circular arc springs vertically.…”

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Isolation Table Using Horizontal Circular Arc Springs and Magnetic Damping

Kodaira

Ohmata

Taguchi

et al. 2007

JEE

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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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