robustness http://popups.lib.uliege.be/1373-5411/index.php?id=2162 Index terms fr 0 Realizability of Anticipatory Feedbacks http://popups.lib.uliege.be/1373-5411/index.php?id=2173 Different methods of system design lead to closed-loop systems which property of stability is unrobust. In the linear time-invariant case it is proved that this fact can be frequently connected with anticipatory feedbacks. Given are the robustness conditions with respect to negligible small time-delay and other parametric perturbations. Tue, 30 Jul 2024 12:31:18 +0200 Thu, 10 Oct 2024 16:44:00 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=2173 Local-Global Interaction on a Phase Space Based on Generative Pointer http://popups.lib.uliege.be/1373-5411/index.php?id=2857 Nonlinear dynamical systems show some different motions such as periodic, chaotic or intermittent ones. On-off intermittency is aperiodic switching motion between laminar phases and burst phases. It is observed in critical points with blowout bifurcation. Occurrence of it is sensitive with respect to parameter shifts in conventional systems. In the present paper, an extended dynamical system with an interaction between a global structure and a local motion is proposed. This interaction means a reciprocal definition between a parameter and state variables. The reciprocal definition is induced from the concept of a generative pointer that suggests an extended subobject classifier. Ubiquitous on-off intermittency is observed for a wide range of parameter values when a generative pointer is applied to a Henon map. This fact implies robustness of on-off intermittency against parameter shifts. Tue, 03 Sep 2024 15:24:24 +0200 Tue, 03 Sep 2024 15:24:31 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=2857 Design of a Robust Globally Stabilizing PD-Process Control System http://popups.lib.uliege.be/1373-5411/index.php?id=2160 We discuss the global asymptotic stabilization of a continuous stirred chemical tank reactor, using linear time invariant PD-control with full state feedback. The control input is the feed temperature or the cooling temperature. The emphasis is placed on the robustness of the design, i.e. the controller globally stabilizes the system's set point without requiring the exact knowledge of the process parameters. The control parameters are tuned by means of a classical root locus analysis of the linearized closed loop dynamics and by simulations of the closed loop transients and phase portraits. The stabilization technique relies on the direct method of Liapunov. Tue, 30 Jul 2024 11:56:35 +0200 Tue, 30 Jul 2024 11:59:14 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=2160