Séminaire d'Automatique du Plateau de Saclay

Séminaire le 13 Février 2017, 10h00 à L2S CentraleSupelec, Salle du Conseil
Wei Li and Lucien Etienne

The next seminars in the framework of the "Séminaire d'Automatique du Plateau de Saclay" of iCODE will be held on Monday 13th February in Salle du conseil of L2S at CentraleSupelec (Gif-sur-Yvette), 4th floor.

10h-11h: Lucien Etienne (L2S, CentraleSupélec) - Observer synthesis under time-varying sampling for Lipschitz nonlinear systems

ABSTRACT: The problem of observation of continuous-time nonlinear Lipschitz systems under time-varying discrete measurements is studied. This class of systems naturally occurs when continuous processes are observed through digital sensors and information is sent via a network to a computer for state estimation. Since network introduces uncertainties in the sampling time, the observer must be designed so to take these uncertainties into account. Here two classes of observation scheme are studied. First an impulsive observers, which make instantaneous correction when information is received, is considered. Then a Luenberger-like observer with a piece wise constant correction term is studied. For both classes of observer, generic conditions are provided. Then a restriction of the generic conditions is used to establish tractable conditions that allows the synthesis of an observer gain.

BIOGRAPHY: Lucien Etienne received a M.Sc. Degree in applied mathematics at the INSA Rouen in 2012 and a joint Ph.D. in automatic control from the university of L'Aquila and the university of Cergy-Pontoise in 2016. After a Post-doc at INRIA Lille on observer synthesis for sampled data system, he is currently Post-doc at L2S Central Supéléc working on switched systems for embedded control under mixed stochastic/deterministic timing uncertainty.
His research interests include switched and hybrid systems, Observer synthesis and sampled data systems.

11h-12h: Wei Li (Nanjing University, China) - Cooperative Control of Multi-Agents: On a Sphere Manifold and in the Euclidean Space.

ABSTRACT: The talk will discuss cooperative control of multi-agents on a sphere and in the Euclidean space. We will first consider the control law design of agents on a sphere, and analyze the stability, scaling, and geometry properties, and discuss future directions. Then, for agents evolving in the Euclidean space, we will consider coupled agents with second-order dynamics. The state of a single agent includes both position and velocity, thus generally, the agents have both velocity coupling and position couplings (VCPC); and if we consider different VCPC, then interesting yet difficult problems arise. We then discuss two aspects of analysis on consensus convergence , and future directions.

BIOGRAPHY: Wei Li received the Ph.D. degree in Automatic Control from Shanghai Jiao Tong University, Shanghai, China, in 2008. From 2009 to 2010, he was a Post-Doctoral Research Associate with the Department of Electrical Engineering, The University of Texas at Dallas, Dallas, TX, USA. Since 2010, he has been an Associate Professor with the Department of Control and Systems Engineering, Nanjing University, Nanjing, China. His current research interests include robotics, autonomous mobile robots, decentralized control, cooperative control of mobile robotic agents, and wireless sensor networks. Dr. Li is an Associate Editor of Asian Journal of Control. He is a Senior Member of IEEE.