Analysis and design of extremum seeking controllers
Dragan Nesic (The University of Melbourne)
SYSTEMS AND CONTROL SERIESDATE: 2012-09-28
TIME: 11:00:00 - 12:00:00
LOCATION: RSISE Seminar Room, ground floor, building 115, cnr. North and Daley Roads, ANU
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ABSTRACT:
Extremum seeking is an approach for steady-state online optimization that deals with situations when the plant model and/or the cost to optimize are not available to the designer but it is assumed that measurements of the plant input and output signals are available. Using these available signals, the goal is to design a controller that dynamically searches for the optimizing inputs. This method was successfully applied to biochemical reactors, ABS control in automotive brakes, variable cam timing engine operation, electromechanical valves, axial compressors, mobile robots, mobile sensor networks, optical fibre amplifiers and so on. Interestingly, it was observed in the literature that some bacteria (such as the flagella-actuated E. Coli) and swarms of fish collectively search for food using extremum seeking techniques.
This talk presents a summary of our recent results on a class of adaptive extremum seeking controllers that are very popular among the practitioners. We provide a unifying framework for design of general extremum seeking schemes by combining an arbitrary optimization method, such as the continuous Newton, with an appropriate estimator of the derivatives of the input-output steady-state map for the system. We use the methods of averaging and singular perturbations to provide a precise characterization of the convergence properties of the closed loop system, as well as the tuning guidelines for the controller parameters.
BIO:
Dragan Nesic is a Professor in the Department of Electrical and Electronic Engineering at The University of Melbourne.
Prof Nesic is currently an ARC Future Fellow funded by the Australian Research Council (2010-2013). He has been a recipient of an ARC Australian Professorial Fellowship (APF) awarded by the Australian Research Council (2004-2008).
He has held an Alexander von Humboldt Research Fellowship awarded by the Alexander von Humboldt Foundation (Germany) in order to pursue research in Germany for a period of six months. He is an Associate Editor for the journals IEEE Transactions on Automatic Control , Automatica , European Journal of Control and Systems and Control Letters . Prof Nesic has served on International Program Committees of many international conferences, such as the American Control Conference, IEEE Conference on Decision and Control, NOLCOS, Asian Control Conference, European Control Conference, and so on. Prof Nesic is a Fellow of IEEE and a Fellow of IEAust . Prof Nesic has been named a Distinguished Lecturer of the Control Systems Society of the IEEE and is currently serving as a Chair of Technical Committee for Nonlinear systems and control, Control Systems Society, IEEE.
