Identification and control of web processes: Polymer film extrusion

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  • P.E. Wellstead
    University of Manchester
  • W.P. Heath
    Lucas AVSD
  • A.P. Kjaer
The paper describes an approach to the identification and control of the cross-directional (CD) properties of web-forming processes, and its application to polymer film extrusion. Discrete orthonormal Chebyshev polynomials are used to model the CD behaviour. This allows a Chebyshev domain estimator for CD profile response to be formulated, and constrained Chebyshev domain optimisation of the CD profile to be used. The result is an identification and control procedure for the CD profile problem which is consistent in its use of the Chebyshev framework, and which is also applicable to other web-forming processes.
Original languageUnknown
Pages (from-to)321-331
Number of pages11
JournalControl Engineering Practice
Volume6
Issue number3
DOIs
Publication statusPublished - 1 Mar 1998
Externally publishedYes
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