2 research outputs found

    Estimation et commande des systĂšmes descripteurs

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    This thesis addresses the estimation and control for nonlinear descriptor systems. The developments are focused on a family of nonlinear descriptor models with a full-rank descriptor matrix. The proposed approaches are based on a Takagi-Sugeno (TS) descriptor representation of a given nonlinear descriptor model. This type of TS models is a generalization of the standard TS ones. One of the mains goals is to obtain conditions in terms of linear matrix inequalities (LMIs). In the existing literature, the observer design for TS descriptor models has led to bilinear matrix inequality (BMI) conditions. In addition, to the best of our knowledge, there are no results in the literature on controller/observer design for discrete-time TS descriptor models (with a non-constant and invertible descriptor matrix).Three problems have been addressed: state feedback controller design, observer design, and static output feedback controller design. LMI conditions have been obtained for both continuous and discrete-time TS descriptor models. In the continuous-time case, relaxed LMI conditions for the state feedback controller design have been achieved via parameterdependent LMI conditions. For the observer design, pure LMI conditions have been developed by using a different extended estimation error. For the static output feedback controller, LMI constraints can be obtained once an auxiliary matrix is fixed. In the discretetime case, results in the LMI form are provided for state/output feedback controller design and observer design; thus filling the gap in the literature. Several examples have been included to illustrate the applicability of the obtained results and the importance of keeping the original descriptor structure instead of computing a standard state-space.Cette thĂšse est consacrĂ©e au dĂ©veloppement des techniques d’estimation et de commande pour systĂšmes descripteurs non linĂ©aires. Les dĂ©veloppements sont centrĂ©s sur une famille particuliĂšre de systĂšmes descripteurs non linĂ©aires avec une matrice descripteur de rang plein. Toutes les approches prĂ©sentĂ©es utilisent un formalisme de modĂ©lisation du type Takagi-Sugeno (TS) pour reprĂ©senter les modĂšles descripteurs non linĂ©aires. Un objectif trĂšs important est de dĂ©velopper des conditions sous la forme d’inĂ©galitĂ©s matricielles linĂ©aires (LMI, en anglais). Dans la littĂ©rature, les conditions pour l’estimation des modĂšles TS descripteurs s’écrivent sous forme d’inĂ©galitĂ©s matricielles bilinĂ©aires (BMI, en anglais). En plus, Ă  notre connaissance, il n’y pas de rĂ©sultats dans la littĂ©rature concernant la commande/estimation pour les modĂšles TS descripteurs en temps discret (avec une matrice descripteur rĂ©guliĂšre non linĂ©aire).Trois problĂšmes ont Ă©tĂ© examinĂ©s : commande par retour d’état, estimation de l’état et commande statique par retour de la sortie. Dans le cas continu, des conditions moins conservatives ont Ă©tĂ© dĂ©veloppĂ©es pour la commande par retour d’état. Pour l’estimation d’état, des conditions LMI ont Ă©tĂ© obtenues (au lieu des usuelles BMI) en utilisant un diffĂ©rent vecteur d’erreur augmentĂ©. Pour la commande statique par retour de la sortie, des conditions LMI sont proposĂ©es si une matrice auxiliaire est fixĂ©e. Pour le temps discret, des nouveaux rĂ©sultats sous la forme LMI ont Ă©tĂ© dĂ©veloppĂ©es pour la commande/estimation, comblant ainsi certains manques de la littĂ©rature. Des exemples ont Ă©tĂ© inclus pour montrer l’applicabilitĂ© de tous les rĂ©sultats que nous avons obtenus et ainsi l’importance de garder la structure originale des descripteurs

    Proceedings of the ECCOMAS Thematic Conference on Multibody Dynamics 2015

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    This volume contains the full papers accepted for presentation at the ECCOMAS Thematic Conference on Multibody Dynamics 2015 held in the Barcelona School of Industrial Engineering, Universitat Politùcnica de Catalunya, on June 29 - July 2, 2015. The ECCOMAS Thematic Conference on Multibody Dynamics is an international meeting held once every two years in a European country. Continuing the very successful series of past conferences that have been organized in Lisbon (2003), Madrid (2005), Milan (2007), Warsaw (2009), Brussels (2011) and Zagreb (2013); this edition will once again serve as a meeting point for the international researchers, scientists and experts from academia, research laboratories and industry working in the area of multibody dynamics. Applications are related to many fields of contemporary engineering, such as vehicle and railway systems, aeronautical and space vehicles, robotic manipulators, mechatronic and autonomous systems, smart structures, biomechanical systems and nanotechnologies. The topics of the conference include, but are not restricted to: ● Formulations and Numerical Methods ● Efficient Methods and Real-Time Applications ● Flexible Multibody Dynamics ● Contact Dynamics and Constraints ● Multiphysics and Coupled Problems ● Control and Optimization ● Software Development and Computer Technology ● Aerospace and Maritime Applications ● Biomechanics ● Railroad Vehicle Dynamics ● Road Vehicle Dynamics ● Robotics ● Benchmark ProblemsPostprint (published version
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