The stabilization problem of aperiodic sampleddata linear systems subject to input constraints is dealt with. A state feedback control law is designed to optimize the size of a polyhedral estimate of the region of attraction of the origin (RAO) of the closed-loop system. The control law is derived from the computation of a controlled contractive polytope for the dynamics between two successive sampling instants. The polytope is of low complexity as its number of vertices is fixed a priori. As shown in the numerical example, the polyhedral estimate of the RAO associated with the proposed feedback control is larger than the ones obtained with other approaches in the literature.
I. INTRODUCTIONThe use of methods based on polyhedral sets to address the stability analysis and stabilization of dynamic systems is quite appealing [1]. In particular, it is known that a linear uncertain system is robustly stabilizable if and only if there exists a polyhedral control Lyapunov function for it or, equivalently, a polyhedral controlled invariant set [1]. Moreover, polyhedrons form a class of sets particularly suitable for the application of iterative procedures like the one in [2], that converges to the maximal controlled invariant/contractive set for the system. However, the sets obtained by such algorithms become more complex at each iteration, making the obtained solutions intractable in many important cases [1]. In order to circumvent this problem, many approaches exist in the literature for linear systems subject to constraints, as, for instance, [3], [4], [5], [6], [7]. In [3] a procedure that does not rely on iterative computations is developed while in [4] an algorithm based on linear programming that allows to overcome the complexity inherent to the Minkowski set addition is presented. In turn, [5], [6], [7] develop methods to compute polyhedrons of low complexity in order to get conservative but computationally affordable results.Aperiodic sampled-data systems have been the focus of many recent works, since they allow to model the behavior of networked control systems subject to uncertainties in the communication channel between computer algorithms, actuators and sensors [8]. Many approaches exist to perform the stability analysis of such systems as, for instance, [9], [10], [11] in the linear case and [12], [13], [14] in the presence