Abstract
There is considerable economic incentive for improved timber drying in terms of reduced total drying time, lower wastage levels and improved product quality. This paper presents simulation results in two areas pertinent to improved timber drying productivity. Firstly, ii is shown that limber drying can be posed and solved as a nonlinear mode! predictive control problem. It is also shown that using only the initial moisture content and an on-line measurement of a timber stack's weight is sufficient to design a closed-loop corurol system whose performance is essentially indistinguishable from that achieved using an open-loop system based on perfectly known drying and internal stress models. In both open and closed-loop cases, significant improvements in both total drying time and final product quality were predicted.
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