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On the Dynamic Resilience and Novel Dead Time Compensators for Plants with Multiple Dead Times

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Abstract:
The dynamic behaviour of many engineering systems and communication networks is dominated by dead-times (or time delays) which exert severe limitations on the performance and dynamic resilience of such systems. Hence control strategies that can potentially improve the performance and the dynamic resilience of those processes are of central importance. In my talk I will present new structures of optimal dead time compensators (DTC) for LTI MIMO plants with multiple I/O delays. These new DTC's shed light and enable to clarify the long standing issue of whether the dynamic resilience and performance of such plants can be improved sometimes by adding artificially dead times to the plant. Using recent extensions of the loop shifting technique to cases with multiple I/O delays, new solutions to the H2 optimal control of such systems are obtained. These new solutions suggest new DTC structures and demonstrate that artificial increases in delays do not necessarily improve resilience and performance. It will be further shown that the improved performance of the new DTCs may be attributed to novel inter-channel feedforward components of the new DTCs and that unlike the ad hoc procedures for constructing DTCs and the optimal methods for single delay cases, the structure of the optimal DTC does depend on the exogenous inputs and the control goals. Simple examples will be used to demonstrate the results.

Type of Seminar:
Public Seminar
Speaker:
Prof. Zalman J. Palmor
Danciger Professor of Engineering Faculty of Mechanical Engineering, Technion-IIT, Haifa 32000, Israel
Date/Time:
May 13, 2009   17:15 /
Location:

ETH Zentrum, Gloriastrasse 35, Building ETZ , Room E6
Contact Person:

Prof. M. Morari
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Biographical Sketch:
Zalman J. Palmor is the Danciger Professor of Engineering and the Deputy Executive Vice President for Academic Affairs at the Technion – Israel Institute of Technology. He received his BSc and MSc degrees in Mechanical Engineering in 1966 and 1972 respectively, from the Technion and his PhD in Chemical Engineering from the City College, CUNY, New York in 1976. Until 1978 he worked for Taylor Instrument Co., Rochester NY. In 1979 he joined the Faculty of Mechanical Engineering at the Technion IIT where he is a full professor and until December 2006 he was the Dean of the Faculty for five years. Professor Palmor is actively involved with industry and international engineering entities as a consultant and some of his control algorithms were installed and distributed world wide by leading vendors of process control equipment. In 1984 and 1993 he was a visiting Professor at the University of Rochester, NY and and at the University of Melbourne in 2000. In 1994 he was a visiting scientist with ABB Kent-Taylor Inc. and ABB Process Automation, NY. His research interests include control of systems with delays, sampled-data systems, auto-tuning and the application of control to mechanical devices and to chemical processes.