Einladung zum Vortrag im Kolloquium
Delay effects on stability of dynamical interconnected systems.
Algorithms & applications
Dr. Silviu-Iulian Niculescu
Laboratoire des Signaux et Systèmes
CNRS SUPELEC Université Paris Sud
Gif-sur-Yvette · France
Montag, 31. Mai 2010 · 15:15 Uhr
IST-Seminarraum 3.243 · Pfaffenwaldring 9 · Campus Stuttgart-Vaihingen
It is well-known that the interconnection of two or more dynamical systems leads to an increasing complexity of the overall system’s behavior due to the effects induced by the emerging dynamics (in the presence or not of feedback loops)in strong interactions (sensing, communication) with the environment changes. One of the major problems appearing in such interconnection schemes is related to the propagation, transport, and communication delays acting ”through”and ”inside” the interconnections.
The aim of this talk is to present briefly some ”user-friendly” methods and techniques frequency-domain approaches)for the analysis and control of the dynamical systems in presence of delays. The presentation is as simple as possible, focusing on the main intuitive (algebraic, geometric) ideas to develop theoretical results, and their potential use in practical applications. Single and multiple delays will be both considered. Classical control schemes (as, for example, the well-known PI and PID controllers, or Smith predictors) will be also revisited. The talk ends with the analysis of some control schemes used in the motion synchronization in shared virtual environments. The presentation is mainly based on [1, 2] (and the references therein).
 W. Michiels and S.-I. Niculescu: Stability and stabilization of time-delay systems. An eigenvalue based approach
(SIAM: Philadelphia, vol. 12, Series on Advances in control and design, 2007).
 S.-I. Niculescu: Delay Effects on Stability: A Robust Control Approach (Springer-Verlag: Heidelberg, LNCIS,
vol. 269, 2001).
Silviu-Iulian Niculescu received the B.S. degree from the Polytechnical Institute of Bucharest, Romania, the M.Sc.,and Ph.D. degrees from the Institut National Polytechnique de Grenoble, France, and the French Habilitation (HDR)from Universit de Technologie de Compi`egne, all in Automatic Control, in 1992, 1993, 1996, and 2003, respectively.
He is currently Research Director at the CNRS (French National Center for Scientific Research) and the head of L2S (Laboratory of Signals and Systems), a common research unit of CNRS with SUPELEC and Université Paris-Sud (Orsay) located at Gif-sur-Yvette. He is also the responsible of the IFAC (International Federation of Automatic Control)Research Group on ”Time-delay systems” since its creation in October 2007.
Author/co-author of 3 books and of more than 300 scientific papers, his research interests include delay systems, robust control, operator theory, and numerical methods in optimization, and their applications to the design of engineering systems. For further information: http://silviu.niculescu.lss.supelec.fr