Explicit robustness and fragility margins for linear discrete systems with piecewise affine control law

• Ngoc Anh Nguyena ^[1] ; Sorin Olaru ^[1] ; Pedro Rodríguez-Ayerbe ^[1] ; Morten Hovd ^[2]
  1. [1] University of Paris-Sud

     University of Paris-Sud

     Arrondissement de Palaiseau, Francia

     
  2. [2] Norwegian University of Science and Technology

     Norwegian University of Science and Technology

     Noruega

     
• Localización: Automatica: A journal of IFAC the International Federation of Automatic Control, ISSN 0005-1098, Vol. 68, 2016, págs. 334-343
• Idioma: inglés
• DOI: 10.1016/j.automatica.2015.10.048
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• Resumen

  • In this paper, we focus on the robustness and fragility problem for piecewise affine (PWA) control laws for discrete-time linear system dynamics in the presence of parametric uncertainty of the state space model. A generic geometrical approach will be used to obtain robustness/fragility margins with respect to the positive invariance properties. For PWA control laws defined over a bounded region in the state space, it is shown that these margins can be described in terms of polyhedral sets in parameter space. The methodology is further extended to the fragility problem with respect to the partition defining the controller. Finally, several computational aspects are presented regarding the transformation from the theoretical formulations to explicit representations (vertex/halfspace representation of polytopes) of these sets.