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Author Pittner, J. ♦ Simaan, M.A.
Sponsorship IEEE Industry Applications Society
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1972
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics
Subject Keyword Riccati equations ♦ Optimal control ♦ Nonlinear equations ♦ Milling machines ♦ Strips ♦ Control systems ♦ Control nonlinearities ♦ Delay effects ♦ Robust control ♦ Nonlinear control systems ♦ state-dependent Riccati equation ♦ Pointwise linear quadratic optimal controller ♦ rolling mill control ♦ rolling mill model
Abstract The tandem cold rolling of metal strip is a large multiinput-multioutput process that presents a difficult challenge to the control designer because of the following factors: 1) the complex interactions between the process variables; 2) the nonlinearities; and 3) the interstand time delays that change significantly with the mill speed. Control systems using the present technology have produced an acceptable product but are limited in their capability for improvement in performance and robustness, and therefore, there is a need for a better approach. It is considered that the state-dependent algebraic Riccati equation technique for the control of nonlinear systems that has been quite successful in the aerospace industry might fulfil this need. This paper presents the results of an initial work performed to investigate the theoretical and applied aspects of this technique for the control of the tandem cold rolling mill. In this paper, nonlinear state space equations are derived from a mathematical model of the mill, and a controller using the state-dependent Riccati equation approach (with trims) is developed. By simulation of typical operating conditions, the controller, when coupled to the model, is shown to be effective in reducing the effects of disturbances in entry strip thickness and hardness.
Description Author affiliation :: Dept. of Electr. Eng., Univ. of Pittsburgh, PA, USA
ISSN 00939994
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2006-05-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 42
Issue Number 3
Size (in Bytes) 258.58 kB
Page Count 8
Starting Page 836
Ending Page 843

Source: IEEE Xplore Digital Library