Abstract
A hybrid experimental method, in which an actuator-excited vibration experiment and a response analysis with a computer are on-line combined and simultaneously conducted, is being developed as a new seismic experimental method for structural systems. It is necessary to conduct a hybrid experiment in real time so that the dynamic characteristics of the structure under experiment can be considered in the response calculation. In a real-time hybrid experiment, however, the actuator response delay is equivalent to negative damping. To solve the problem, we proposed an actuator control compensation method which predicts the displacement to be realized by the actuator past the actuator response delay time and also modifies the parameters for prediction according to the vibration conditions, and introduced it to the hybrid experimental system we developed. It was found that the compensation method can cancel the delay and give precise experimental results as long as the vibration conditions are within the stable region which is defined with the actuator response delay time and the frequency of the vibration. The efficiency of the compensation was verified with the results of actual hybrid experiments for single-degree-of-freedom systems.
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