Mc. Turner et I. Postlethwaite, Guaranteed stability regions of linear systems with actuator saturation using the low-and-high gain technique, INT J CONTR, 74(14), 2001, pp. 1425-1434
The stability regions of input-saturated linear systems are examined, with
attention focused on state-feedback LQ control. The results describe hyper-
ellipsoidal domains, which are subsets of the actual domain of attraction f
or the system. This is not new; the novelty is in the use of the low-and-hi
gh gain technique, to reduce conservatism in the results. In addition to th
e standard regulator, the tracking case is treated and some comments are ma
de regarding other extensions.