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Journal Articles Journal of Process Control Year : 1997

Dynamics analysis and control strategy for a mixed flow corn dryer

Abstract

In most cases, industrial mixed flow corn dryers are controlled manually or by using very simple heuristic procedures, with a relatively poor performance. A detailed analysis, carried out using both a first principles model and a black-box approach, shows important non-linearities and gives a better insight into plant dynamics which may explain difficulties in using conventional linear control. Prior knowledge is used to derive a combined logarithmic and variable sample period co-ordinate transformation which is shown to linearize the plant exactly under reasonable simplifying assumptions. The resulting linear model has a rather special structure and better approximation capabilities than common transfer functions with many more estimated parameters. The control implications of the model are analysed. A simple PI controller is shown to be a suitable choice for an industrial application and significant improvements cannot be expected from more sophisticated designs such as LQG.

Dates and versions

hal-01200652 , version 1 (16-09-2015)

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Ioan-Cristian Trelea, Francis Courtois, Gilles Trystram. Dynamics analysis and control strategy for a mixed flow corn dryer. Journal of Process Control, 1997, 7 (1), pp.57-64. ⟨10.1016/S0959-1524(96)00013-3⟩. ⟨hal-01200652⟩
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