Title :
Robust, fragile or optimal?
Author :
Keel, L.H. ; Bhattacharyya, S.P.
Author_Institution :
Center of Excellence in Inf. Syst., Tennessee State Univ., Nashville, TN, USA
Abstract :
We show by examples that optimum and robust controllers, designed by using the H2, H∞, l1 and μ formulations, can produce extremely fragile controllers, in the sense that vanishingly small perturbations of the coefficients of the designed controller destabilize the closed loop control system. The examples show that this fragility also usually manifests itself as extremely poor gain and phase margins of the closed loop system
Keywords :
H∞ control; closed loop systems; control system synthesis; linear systems; robust control; μ design; H∞ design; H2 design; closed loop control system; fragile controllers; gain margins; l1 design; optimum controllers; phase margins; robust controllers; Algorithm design and analysis; Closed loop systems; Control systems; Hydrogen; Information systems; Robust control; Robust stability; Robustness; Transfer functions; Uncertainty;
Conference_Titel :
American Control Conference, 1997. Proceedings of the 1997
Conference_Location :
Albuquerque, NM
Print_ISBN :
0-7803-3832-4
DOI :
10.1109/ACC.1997.609747
