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Abstract

This study compares the relative performance of distinct microcomputer control algorithms for drying a textile sheet in an infrared oven. The process responses to changes in the set point as well as perturbations in the traveling velocity of the sheet and the inlet humidity of the sheet are analyzed. Feedback, feedforward, and hybrid control algorithms are considered. The results indicate that the performance of the feedback control algorithm is negatively affected by the time delay associated with the traveling of the sheet in the dryer. The feedforward control algorithm exhibits more rapid dynamics, but falls short of reaching the set point because of model imperfection. The hybrid control algorithm, combining the feedback and feedforward controls, gives the best results overall.

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Numerical Control of a Continuous Infrared Dryer

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