It is because the actuator is the final step in the control chain that failure can be so important and hard to compensate for. When the nature or location of the failure is unknown, the offsetting of consequent system uncertainties becomes even more awkward.
This monograph centers on counteracting situations in which unknown control inputs become indeterminately unresponsive over an uncertain period of time by adapting the responses of remaining functional actuators. Both "lock-in-place" and varying-value failures are dealt with. The results presented demonstrate:
? the existence of nominal plant-model matching controller structures with associated matching conditions for all possible failure patterns;
? the choice of a desirable adaptive controller structure;
? derivation of novel error models in the presence of failures;
? the design of adaptive laws allowing controllers to respond to combinations of uncertainties stemming from activator failures and system parameters.
From the reviews:
The monograph describes adaptive actuator failure compensation control schemes for systems with uncertain actuator failures ? The monograph is a comprehensive and self-contained exposition supposing the knowledge of linear systems and feedback control at the undergraduate level. Graduate students, researchers, and professionals working in the areas of control engineering, computer science, and applied mathematics will appreciate this book as a significant up-to-date technical reference in the field.
Zentralblatt MATH 1063 (2005) (Reviewer: Lubomír Bakule)
