Title :
Conditions for preservation of stability of adaptive controllers for systems with unmodeled delay
Author :
Fernandez, George ; Ortega, Romeo ; Begovich, Ofelia
Author_Institution :
Div. de Estudios de Posgrado, Fac. de Ingenieria, Mexico City, Mexico
fDate :
6/1/1988 12:00:00 AM
Abstract :
Some recent results from the mathematical literature are used to derive conditions under which stability of an adaptive controlled system (first-order plant with output feedback) is preserved in spite of the presence of a time delay in the plant input. Bounds on the delay, for which stability is preserved, are derived for three robust versions of the gradient update law: fixed σ modification with and without normalization and a time-varying σ modification
Keywords :
adaptive control; delays; stability; adaptive controllers; fixed σ modification; stability preservation condition; time-varying σ modification; unmodeled delay; Adaptive control; Adaptive systems; Control systems; Delay effects; Delay systems; Equations; Output feedback; Programmable control; Robust stability; Upper bound;
Journal_Title :
Automatic Control, IEEE Transactions on
