Method of estimating unknown or imprecisely known variables...

Details Method of estimating unknown or imprecisely known variables... Method of estimating unknown or imprecisely known variables...

D - Textiles, Paper

21

F

D21F 11/00 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2379228

Method of estimating unknown or imprecisely known variables in a paper making process wherein a mathematical model of a process is formed, the model including at least one target variable which is unknown or imprecisely known. A plurality of process variables and at least one property of a manufactured paper are measured. At least one of said measured variables or properties is chosen as a reference variable. An initial value is chosen for the target variable for solving the mathematical model and a difference between the simulated reference variable and the measured reference variable is determined. The difference constitutes a cost function which is optimized to estimate the unknown or imprecisely known value of the target variable.

L'invention concerne un procédé pour faire une estimation de variables inconnues ou connues de façon imprécise dans un processus de fabrication de papier, selon lequel on établit un modèle mathématique du processus, le modèle comprenant au moins une variable cible inconnue ou connue de façon imprécise. On mesure plusieurs variables du processus et au moins une des propriétés du papier manufacturé. Au moins une de ces variables mesurées est choisie comme variable de référence. Une valeur initiale est choisie pour la variable cible afin de solutionner le modèle mathématique, et l'on détermine une différence entre la variable de référence simulée et la variable mesurée. La différence constitue une fonction de coût qui est optimisée pour estimer la valeur inconnue ou connue de façon imprécise de la variable cible.

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