Design and experimental validation of an optimal fractional order controller for vibration suppression

In this paper, a fractional order optimal controller is designed, tested and validated experimentally for seismic mitigation in a one floor structure. The design is based on a two-step optimization procedure. The first step is concerned with the computation of the classical optimal controller gains. A second step follows that deals with the computation of an optimal fractional order parameter value that minimizes the attenuation level. The designed controller is implemented and tested experimentally on a laboratory scale civil structure. For comparison purposes, the passive seismic mitigation case is also considered, as well as the active case using the traditional optimal controller. The closed loop experimental results show that the designed fractional order optimal controller can ensure an improved attenuation level in the occurrence of a seismic event in comparison to the classical optimal controller.

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