Keynote Lecture
Luís Paulo Reis, University of Porto, Portugal
Analysis and Control Design Tools for Dynamical Systems with Time-Delay
Wim Michiels, KU Leuven, Belgium
Keynote Lecture
Luís Paulo Reis
University of Porto
Portugal
http://www.fe.up.pt/~lpreis
Brief Bio
Luís Paulo Reis holds a BSc (5 years), MSc (2 years) and PhD degree in Electrical and Computer Engineering from the Faculty of Engineering of the University of Porto (FEUP), Associate Professor of DEI/FEUP - Department of Computer Engineering (DEI) of FEUP and Director of LIACC/UP - Laboratory of Artificial Intelligence and Computer Science of the same University. It has a complete and very well balanced curriculum in the main areas of Computer Engineering and Computer Science with emphasis on the areas of Artificial Intelligence, Intelligent Robotics, Machine Learning, Interaction /Games, Computer Programming and Information Systems. He has very good academic qualification, teaching experience, research experience, knowledge transfer experience and management experience in these areas.
Analysis and Control Design Tools for Dynamical Systems with Time-Delay
Wim Michiels
KU Leuven
Belgium
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Brief Bio
Wim Michiels (1974) obtained a MSc degree in Electrical Engineering and a PhD degree in Computer Science from KU Leuven, in 1997 and 2002. He was a postdoctoral fellow of the Research Foundation Flanders (2002-2008) and a research associate at the Eindhoven University of Technology (2007). In 2008 he was appointed as an assistant professor at KU Leuven (associated professor 2012, professor 2017, full professor 2021), where he leads a research team within the Numerical Analysis and Applied Mathematics (NUMA) Section. His research interests include mathematical systems theory, dynamical systems, control and optimization, numerical linear algebra and scientific computing. His work focuses on the analysis and control of systems described by functional differential equations and other infinite-dimensional systems, on control of systems with a network structure, and on large-scale linear algebra problems in the context of control and optimization. He has published in a variety of journals in the area of computational and applied mathematics, control theory, optimization and dynamical systems. He is lead author of the book Stability, Control and Computation of Time-Delay Systems, SIAM, 2014 (2nd edition). He coordinated the H2020 Innovative Training Network UCoCoS, on the analysis and control of complex systems. He has been Associate Editor for the IEEE Transactions on Automatic Control (2014-2019), Systems and Control Letters (2010-2014 and 2023-), Communications in Nonlinear Science and Numerical Simulation (2015-2018), Calcolo (2019-), Frontier in Control Engineering (2020-) and area editor of the Springer book series Advances in Delays and Dynamics (2014-). He has been an IPC chair of the IFAC Workshop on Time-Delay systems (2016, 2021) and the IFAC Workshop on Periodic Control Systems (2016) and has been co-organizer of the ILAS 2016 conference in Leuven. He established and currently leads the IFAC Working Group on Time-Delay Systems (with G. Orosz). He a passionate teacher of six yearly courses at KU Leuven and has vast experiences as lecturer in international PhD training programs (SOCN, CISM, DISC, EECI). He has been a member of the KU Leuven Research Council.
Abstract
Time-delays are important components of many systems from engineering, physics and life science, due to the fact that the transfer of material, energy and information is mostly not instantaneous. They appear for instance as computation and communication lags, they model transport phenomena and hereditary and they arise as feedback delays in control loops. The inclusion of time-delays in the mathematical models gives rise to a description in terms of delay-differential equations.
From a qualitative point of view, the presence of time-delays in dynamical systems may induce complex behavior and this behavior is not always intuitive. Even if the system's equation is scalar, oscillations and chaotic behavior may occur. But on the other hand time-delayed feedback is typically used for stabilizing chaotic systems. Time-delays in control loops are usually associated with degradation of performance and robustness, but there are situation where time-delays are beneficial and even used as controller parameters. Delays may interact with different scales of the system: whereas sometimes very large delays can be tolerated, there are situations where an arbitrarily small delay may destabilize a stable system.
The aim of my talk is to present a control oriented guided tour on time-delay systems. I will first review basic properties of time-delay systems and discuss a flexible modeling framework for interconnected systems, in terms of delay differential-algebraic equations. Next I will address analysis and design methods for structured feedback controllers, relying on non-smooth optimization and illustrated by means of the new software package TDS-CONTROL. Examples from various application domains complete the presentation, with particular emphasis on delay based vibration control methodologies.