A New Strategy for Optimal Control of Continuous Tandem Cold Metal Rolling

    Authors

    J. Pittner; N. S. Samaras;M. A. Simaan

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Ind. Appl.

    Keywords

    Continuous tandem cold rolling; flying gauge change; multi-input-multi-output control; rolling mill control; state-dependent; Riccati equation (SDRE); Engineering, Multidisciplinary; Engineering, Electrical & Electronic

    Abstract

    The control of continuous tandem cold rolling of metal strip is similar to the control of stand-alone tandem cold rolling except that additional challenges occur during the passage of the weld, which generally is done at reduced speed. The more significant issues that must be considered are the following: 1) reducing the length of strip near the weld that has excessive excursions in thickness; 2) reducing the excursions in tension and roll force as the weld goes through a stand; and 3) maintaining the mass flow balance in the mill. This paper presents the results of an investigation of the application of the state-dependent Riccati equation (SDRE) technique developed for improvement in the control of stand-alone tandem cold rolling, to continuous tandem cold rolling, particularly during passage of the weld. Two methods of control during this regime of operation are evaluated and a preferred method is selected. Using the preferred method, it was determined by simulation that the SDRE technique has the capability for successfully controlling the mill during weld passage, so that this novel approach offers a strong potential for improvement in the control of both the stand-alone and continuous tandem cold rolling processes.

    Journal Title

    Ieee Transactions on Industry Applications

    Volume

    46

    Issue/Number

    2

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    703

    Last Page

    711

    WOS Identifier

    WOS:000275854900019

    ISSN

    0093-9994

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