Comparative study of matrix riccati equation solvers for parametric faults accommodation

Linear quadratic fault accommodation is addressed. Under process and/or actuator faults, fault accommodation procedures need the controller to be redesigned, which amounts to solving the matrix algebraic Riccati equation (ARE) associated with the post-fault system model. In this respect, direct and iterative ARE solvers are analyzed, providing two different ways of application, namely the progressive respectively classical accommodation, function whether the ARE solution is used either during or after convergence. The longitudinal control of an aircraft under actuator and structural faults is used to illustrate the approaches.