Abstract
Linear quadratic fault tolerant control is addressed. Under process and/or actuator faults, both fault accommodation and system reconfiguration procedures need the controller to be redesigned, which amounts to solving the algebraic Riccati equation associated with the post-fault system model. To overcome the risks of system instability and/or control inadmissibility that might result from the fault detection and isolation delay and the computation time of the post-fault control law, two progressive accommodation strategies, namely Newton-Kleinman and Matrix-Sign-Function, are investigated. The longitudinal control of an aircraft under actuator and structural faults is used to illustrate the approaches with respect to the handling quality constraints. Copyright c 2009 IFAC
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