Abstract
In this paper, a seismic base-isolated table with a rotational inertia mass and nonlinear restoring force is proposed. The table is supported by ball bearings and produces restoring force by means of a rope and pulleys. The nonlinear dynamic characteristics of this table are investigated analytically and experimentally. The results obtained here are summarized as follows. ( 1 )The developed analytical model of this table has been examined and proved to be valid through comparison between the simulations and experiments. ( 2 )It has been proved that the input seismic acceleration from ground motion to the table was lost due to the effect of the installed rotational inertia mass. ( 3 ) The waveform of acceleration obtained from the dynamic experiment showed keen spikes due to the effect of the nonlinear characteristics of this table, and this phenomenon has been clearly, analyzed by the method of harmonic balance.
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