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Effect of Multivariable Dead Times on the Properties of the Quadruple-Tank Process

[+] Author Affiliations
Zalman J. Palmor, Dmitry Shneiderman

Technion-Israel Institute of Technology, Haifa, Israel

Paper No. ESDA2008-59033, pp. 375-382; 8 pages
doi:10.1115/ESDA2008-59033
From:
  • ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis
  • Volume 2: Automotive Systems; Bioengineering and Biomedical Technology; Computational Mechanics; Controls; Dynamical Systems
  • Haifa, Israel, July 7–9, 2008
  • Conference Sponsors: International
  • ISBN: 978-0-7918-4836-4 | eISBN: 0-7918-3827-7
  • Copyright © 2008 by ASME

abstract

The well known laboratory Quadruple-Tank Process (QTP) has been introduced in the laboratories of many schools around the world as it is ideally suited to illustrate concepts in multivariable control. In this paper the QTP is extended to include independent multivariable dead times (DTs) and their effects on the properties of the QTP are studied. DTs are very common in many various processes and make the control of the QTP more interesting and challenging. The addition of DTs may introduce infinite, finite or not any number of non-minimum-phase (NMP) zeros. As shown in the paper it depends on a particular combination of the multivariable DTs. The conditions for each case are stated and the location and behavior of the zeros closest to the imaginary axis due to the DTs are specified. Other properties of the QTP with DTs as the output real NMP zero directions and the decentralized integral controllability of the process are discussed too. Also, a novel laboratory QTP with DTs is described.

Copyright © 2008 by ASME

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