ROBUST-CONTROL OF UNCERTAIN STRUCTURES

Objective of this paper is to present robust control strategies able t o handle acceleration feedback. The robustness of the controller is in vestigated in respect to both stability and performance measures. The uncertainty set is chosen as a convex one with either real or complex structured uncertainty. H-infinity control is firstly used to comply w ith the stability requirements whereas a mu synthesis approach is then adopted as far as the performance is concerned. The degradation of th e performance in respect to the size of the perturbation is eventually proposed as a merit parameter to rank different controllers. Numerica l simulations are proposed on a MDOF structural system under earthquak e excitation. (C) 1998 Elsevier Science Ltd. All rights reserved.