A new method of active structural control, which suppresses vibrations in civil structures due to seismic
shocks, has been developed. It is based on the equivalent-input-disturbance (EID) approach, which estimates
the effect of a seismic shock and produces an equivalent control signal on the control input channel
to compensate for it. A system designed by this method can be viewed as a conventional state-feedback
control system with an EID estimator plugged in. Unlike conventional control systems, this one has two
degrees of freedom, which yields better control performance. Simulations on a model of a ten-degree-offreedom
building demonstrated the validity of the method. In addition, the effect of the parameters of the
low-pass filter in the EID estimator on the vibration suppression performance was examined. A comparison
revealed that this method is superior to a linear-quadratic regulator and sliding-mode control.
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