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ISA Trans. 2017 May;68:381-401. doi: 10.1016/j.isatra.2017.02.004. Epub 2017 Feb 13.

Dominant root locus in state estimator design for material flow processes: A case study of hot strip rolling.

Author information

1
Dept. of Instrumentation and Control Engineering (DICE), Czech Technical University in Prague, CZ 166 07, Czech Republic; The Czech Institute of Informatics, Robotics and Cybernetics (CIIRC), Czech Technical University in Prague, CZ 166 07, Czech Republic. Electronic address: jaromir.fiser@fs.cvut.cz.
2
Dept. of Instrumentation and Control Engineering (DICE), Czech Technical University in Prague, CZ 166 07, Czech Republic. Electronic address: pavel.zitek@fs.cvut.cz.
3
PT Solutions Worldwide, Ltd., CZ 160 00, Czech Republic. Electronic address: pskopec@ptsw.cz.
4
PT Solutions Worldwide, Ltd., CZ 160 00, Czech Republic. Electronic address: jknobloch@ptsw.cz.
5
Dept. of Instrumentation and Control Engineering (DICE), Czech Technical University in Prague, CZ 166 07, Czech Republic; The Czech Institute of Informatics, Robotics and Cybernetics (CIIRC), Czech Technical University in Prague, CZ 166 07, Czech Republic. Electronic address: tomas.vyhlidal@fs.cvut.cz.

Abstract

The purpose of the paper is to achieve a constrained estimation of process state variables using the anisochronic state observer tuned by the dominant root locus technique. The anisochronic state observer is based on the state-space time delay model of the process. Moreover the process model is identified not only as delayed but also as non-linear. This model is developed to describe a material flow process. The root locus technique combined with the magnitude optimum method is utilized to investigate the estimation process. Resulting dominant roots location serves as a measure of estimation process performance. The higher the dominant (natural) frequency in the leftmost position of the complex plane the more enhanced performance with good robustness is achieved. Also the model based observer control methodology for material flow processes is provided by means of the separation principle. For demonstration purposes, the computer-based anisochronic state observer is applied to the strip temperatures estimation in the hot strip finishing mill composed of seven stands. This application was the original motivation to the presented research.

KEYWORDS:

Constrained estimation; Dominant root locus; Hot strip mill; Material flow; Model-based observer

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