Prof. Bassam Bamieh (University of California, Santa Barbara): Coherence in Large Dynamical Networks: Limitations of Local Feedback

Mon, 03/18/2013

Department of Control Engineering, FEE CTU in Prague invites anyone to a public talk given by Prof. Bassam Bamieh (University of California, Santa Barbara). The talks is organized thanks to the IEEE Control Systems Society Distinguished Lecturer Program (with partial suppport from its national chapter as well). 

The talk will start at 14:30 and will last for about one hour. It will take place in the seminar room G205 on the second floor of G building in the Karlovo namesti campus of CTU in Prague.

Abstract of the talk: Networks of interconnected dynamical systems subject to stochastic disturbances exhibit scaling phenomena that are not present in deterministic networks. Standard notions of stability as a binary property (i.e. a system is either stable or not), or convergence rates, may fail to predict the behavior of large networks. This motivates the study of such networks using system norms as performance measures. This talk will specifically address the notion of network coherence under stochastic disturbances, and its dependence on network topology and various notions of network dimension. Regular lattices and fractal networks provide case studies with both integer and fractional dimension. We give asymptotic lower bounds on network disorder and show its dependence on both the complexity of individual node dynamics, as well as network dimension. It turns out that higher connectivity (network dimension) improves coherence, while more complex node dynamics can hinder it. However, in all cases there is a critical network dimension above which purely local interactions can lead to the emergence of global order. We outline the connections between these results and those on the statistical mechanics of harmonic solids, resistive lattices and random walks. We also present implications to the distributed control of vehicular formations and platoons, as well as phase synchronization in power networks with highly-distributed generation.

Bio: Bassam Bamieh is Professor of Mechanical Engineering at the University of California at Santa Barbara. He received his B.Sc. degree in Electrical Engineering and Physics from Valparaiso University (Valparaiso, IN) in 1983, and his M.Sc. and PhD degrees in Electrical and Computer Engineering from Rice University (Houston, TX) in 1986 and 1992 respectively. Prior to joining UCSB in 1998, he was an Assistant Professor in the Department of Electrical and Computer Engineering and the Coordinated Science Laboratory at the University of Illinois at Urbana-Champaign (1991-98). Professor Bamieh's research interests are in the fundamentals of Control and Dynamical Systems, as well as the applications of systems and feedback techniques in several physical and engineering systems. These areas include Robust and Optimal Control, distributed control and dynamical systems, shear flow transition and turbulence, and the use of feedback in thermoacoustic energy conversion devices. Professor Bamieh has co-authored over 100 refereed publications in Systems and Controls and allied fields. He has received several awards and honors for his research, including an IEEE Control Systems Society G. S. Axelby Outstanding Paper Award, an AACC Hugo Schuck Best Paper Award, and a National Science Foundation CAREER award. He was elected a Distinguished Lecturer of the IEEE Control Systems Society (2005), a Fellow of the International Federation of Automatic Control (IFAC) , and a Fellow of the IEEE with the citation "For contributions to robust, sampled-data and distributed control".

Prof. Bassam is staying in Prague Monday, March 18, through Wednesday, Monday 20 and is available for further scientific discussions.

Image: Prof. Bassam Bamieh (University of California, Santa Barbara): Coherence in Large Dynamical Networks: Limitations of Local Feedback (7)
Image: Announcement of Bassam Bamieh's lecture
Image: Prof. Bassam Bamieh (University of California, Santa Barbara): Coherence in Large Dynamical Networks: Limitations of Local Feedback (1)
Image: Prof. Bassam Bamieh (University of California, Santa Barbara): Coherence in Large Dynamical Networks: Limitations of Local Feedback (2)
Image: Prof. Bassam Bamieh (University of California, Santa Barbara): Coherence in Large Dynamical Networks: Limitations of Local Feedback (3)
Image: Prof. Bassam Bamieh (University of California, Santa Barbara): Coherence in Large Dynamical Networks: Limitations of Local Feedback (4)
Image: Prof. Bassam Bamieh (University of California, Santa Barbara): Coherence in Large Dynamical Networks: Limitations of Local Feedback (5)
Image: Prof. Bassam Bamieh (University of California, Santa Barbara): Coherence in Large Dynamical Networks: Limitations of Local Feedback (6)
Image: Prof. Bassam Bamieh (University of California, Santa Barbara): Coherence in Large Dynamical Networks: Limitations of Local Feedback (8)