ABSTRACT
Fault-tolerant design approaches can be broadly classified into two types: passive fault-tolerant control (FTC) and active FTC. The passive approaches are relatively conservative and the desired control performance for the closed-loop systems may not be satisfied, especially when the number of possible faults and the degrees of system redundancy increase [119, 224]. An active FTC approach can reconfigure systems either by selecting a pre-computed control law or by synthesizing an online control strategy; among these the observer design and robust control methodologies have been widely applied (see [71, 115, 116, 232]).
