Abstract

Some industrial processes are subject not only to varying gain and time-constants, but also to varying dead-time. For instance, in the pulp and paper industry the time delay between the percent solids and the feed liquor flow rate in a black liquor evaporator may change due to unexplained causes. For such a process, the now classical self-tuning regulator is inapplicable, since it requires the knowledge of the process time-delay. This report presents an adaptive dead-time compensator (ADTC) based on a recursive least-squares estimator and a pole placement algorithm. Simulations show that although it does not require the à-priori knowledge of the time-delay, this ADTC can perform near minimum variance. It is also shown that by the use of a variable forgetting factor, this ADTC can accommodate sudden and significant changes in the time-delay.

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