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This paper presents a practical control methodology of the shaking tables for earthquake simulators. Reaction force generated by a nonlinear specimen on the shaking table generally deteriorates the motion performance of the table, resulting in the lower control accuracy of the seismic tests. In order to provide the precise table motion, therefore, a compensator for the reaction force is designed by using a force sensor. The compensator can be designed under considerations of the relationship between the reaction force and the compensation signal, to achieve the desired disturbance suppression performance. The proposed approach has been verified by experiments using an prototype shaking table system.

Controller Design for Reaction Force of Specimen Considering Disturbance Suppression in Shaking Table Systems