Abstract
This paper investigates the dissipativity and performance characteristics of the semiactivecontrol of the base isolated benchmark structure with magnetorheological (MR) fluiddampers. Previously, the authors introduced the concepts of dissipativity and dissipativityindices in the semiactive control of structures with smart dampers and studied thedissipativity characteristics of simple structures with idealized dampers. To investigate theeffects of semiactive controller dissipativity characteristics on the overall performance of thebase isolated benchmark building, a clipped optimal control strategy with a linearquadratic Gaussian (LQG) controller and a 20 ton MR fluid damper model is used.A cumulative index is proposed for quantifying the overall dissipativity of a control systemwith multiple control devices. Two control designs with different dissipativity andperformance characteristics are considered as the primary controller in clipped optimalcontrol. Numerical simulations reveal that the dissipativity indices can be classifiedinto two groups that exhibit distinct patterns. It is shown that the dissipativityindices identify primary controllers that are more suitable for application withMR dampers and provide useful information in the semiactive design processthat complements other performance indices. The computational efficiency ofthe proposed dissipativity indices is verified by comparing computation times.
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