Abstract
This study aims at understanding the influence of some design factors on the performance of a moisture cross-direction(CD) control system in papermaking. Among the factors are: measurement and actuator widths, misalignment of actuator and sensor, measurement noise level, influence of machine-direction variations, and some examples of measurement/actuator mismatch. A simulation system, characterized by dual signal paths, has been designed. One path represents the signal flow in an industrial CD-control system. The purpose of the second path is to examine the true CD-profile and how it is affected by the control actions. The signals in this path represent process information that are generally not available in an industrial system. Sine waves of various frequencies (in cross-machine length-units) are used as the basic process variations to be controlled. Hence, conclusions can be made about the streak reduction capability of the system. Diagrams are presented showing the reduction of the profiles as functions of the design-factors. Another type of result deals with the difference between the measured and the actual CD-profile. The performance of an industrial control system is generally based on the reduction of the variations measured by an online system. The study points out situations where these measurements can lead to misleading conclusions.
Published Version
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