Real-Time Parameter Identification for a Control-Oriented Model of Continuous Infrared Drying of a Wet Fabric

Abstract

Parameters are determined for a model representing the drying dynamics of a wet fabric continuously passing through an infrared oven using a method involving off-line (batch) data processing, as well as by real-time recursive calculation. Drying trials with the infrared oven under various operational conditions demonstrate the strong nonlinearity of the drying process. Because of this, the model parameters established by off-line (batch) processing do not allow adequate calculation of the observed process responses under other different operating conditions. On the other hand, a method of recursive identification applied to real-time treatment of the readings from the oven provides a model with very satisfactory adaptation to changing operational conditions. The results also show that a simple first-order model represents the dynamic characteristics of the oven just as well as models of higher order, thus providing an important advantage for elaborating an efficient numerical controller for the drying process.

Get full access to this article

View all access options for this article.

References

1. Corriou, J. P., “Commande des Procédés,” Collection Génie des Procédés de l'École de Nancy, Techniques & Documentation, 1996.

2. Côté, B. , Thérien, N. , and Broadbent, A. D. , Modélisation et Simulation du Séchage en Continu des Couches Minces par Rayonnement Infrarouge, Can. J. Chem. Eng. 68, 786–794 (1990).

3. Dhib, R. , Thérien, N. , and Broadbent, A. D. , Derivation of a Control Oriented Low Order Model of the Dynamics of an Infrared Oven for the Continuous Drying of a Thin Sheet of Material, Can. J. Chem. Eng. 76, 290–299 (1998).

4. Dhib, R. , Broadbent, A. D. , and Thérien, N. , Modeling and Simulation of the Drying of Thin Sheets in a Continuous Infrared Dryer, Can. J. Chem. Eng. 72, 894–905 (1994).

5. Forget, C. , Broadbent, A. D. , and Thérien, N. , Numerical Control of a Continuous Infrared Dryer, Textile Res. J. 63, 404–413 (1993).

6. Landau, I. D. , “System Identification and Control Design,” Prentice Hall, Englewood Cliffs, NJ, 1990.

7. Skrokov, R. , “Mini- and Microcomputer Control in Industrial Processes—Handbook of Systems and Application Strategies,” Van Nostrand Reinhold Company, NY, 1980.

8. Söderström, T. , and Stoica, P. , “System Identification,” M. J. Grimble , ed., Prentice Hall, NY, 1989.

9. Sounny Slitine, M. D., Identification et Commande en Temps Réel d'un Procédé de Séchage par Rayonnement Infrarouge, Doctoral thesis, Université de Sherbrooke, Québec, 1994.

10.

10. Stoecker, W. F. , and Stoecker, P. A. , “Microcomputer Control of Thermal and Mechanical Systems,” Van Nostrand Reinhold Company, NY, 1989.