An improved shaking-table control method has been developed. This method compensates the reaction force caused by a nonlinear specimen in real time, and thus maintains a desired table acceleration. To do so, it identifies the difference between the desired and the actual transfer characteristics of the shaking table, then compensates for the difference. Because the required time for this combination of identification and compensation is less than one second, the method can compensate, in real time, for the disturbance caused by a nonlinear specimen. By means of a series of experiments, it is confirmed that the method can maintain a desired table acceleration even when a nonlinear specimen is under excitation.
Nowak, R. F., Kusner, D. A., Larson, R. L., and Thoen, B. K., 2000, “Utilizing Modern Digital Signal Processing for Improvement of Large Scale Shaking Table Performance,” Proc. 12th World Conference on Earthquake Engineering, New Zealand, Paper No. 2035.
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