|Synthesis of a Minimum Functional State Observer Approach for Unperturbed/Perturbed Dynamical Systems
Ridha Aloui* and Naceur Benhadj Braiek
International Journal of Control, Automation, and Systems, vol. 16, no. 4, pp.1736-1745, 2018
Abstract : "In this paper, we investigate the synthesis of minimum functional state observer for unperturbed and
perturbed linear time invariant systems. The principal contribution is the design of a minimum functional state
observer, which can estimate directly the state feedback control law. Hence, for the linear time invariant systems,
the existence conditions of a minimum functional state observer are obtained by verification of a special dimension
condition on system matrices. As a matter of fact, the exact solution of the proposed approach is determined, and
the minimum functional state observer that has the same dimension as the control vector is derived by solving a
set of linear matrix inequality (LMI) constraints. Whereas, for perturbed linear systems, the proposed minimum
functional state observer scheme is developed to ensure the robust quadratic stability of the augmented system.
The robustness issue is given via the reconstructed control law designed using an LMI based H∞ method; so that
the desired design matrices are derived through the resolution of an optimum LMI system. The effectiveness and
usefulness of the proposed approach are validated through a flexible link robot example."
"Functional observer design, LMI optimization problem, minimum order observer, state feedback control, unperturbed/perturbed linear time invariant systems."