Coupling characteristic analysis of a large hydraulic centrifugal shaker

A centrifugal shaker is considered as the most advanced and effective equipment in aseismic field. A coupled mathematical model of a light-flexible base, a hydraulic actuator and a soil model was established to clarify the coupling characteristic of a centrifugal shaker. The light-flexible base was firstly simplified as a continuous mass spring to deduce the natural frequencies estimation method of the light-flexible base and to derive the equivalent method for the base's dynamic characteristic. Then, the transfer function of the coupled system was deduced by integrating four kinds of the fundamental equations according to the prior equivalent model of the centrifugal shaker. Finally, the servo control strategy of the centrifugal shaker was investigated. The design requirement of the system's frequency bandwidth was satisfied by designing a forward filter, a three-state feedback controller and a forward-feed controller.