By K. Najim, E. Dufour

This quantity includes forty papers which describe the new advancements in complicated regulate of chemical procedures and comparable industries. the themes of adaptive keep an eye on, model-based regulate and neural networks are lined through three survey papers. New adaptive, statistical, model-based keep watch over and synthetic intelligence recommendations and their functions are unique in different papers. the matter of implementation of regulate algorithms on a electronic computing device is usually thought of

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Additional info for Advanced Control of Chemical Processes 1991. Selected Papers from the IFAC Symposium, Toulouse, France, 14–16 October 1991

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H o w e v e r , we get s o m e sights on the process by a m a t h e m a t i c a l a n a l y s i s , s e a r c h i n g a r e l a t i o n s h i p from i n p u t / o u t p u t observations (Majdoul et al. 1988). Thus we have selected an i n p u t - o u t p u t discrete time model to r e p r e s e n t the d y n a m i c behaviour of the main c o n t r o l l o o p (fuel rate / i n n e r c a l c i n a t i o n r e a c t o r t e m p e r a t u r e ) . T h i s c h o i c e is d i c t a t e d by the fact that the reactor t e m p e r a t u r e is a p r e d o m i n a n t c r i t e r i o n of t h e final p r o d u c t quality, while the fuel rate is the energy to be m i n i m i z e d .

In the present c a s e , a physical model c a n n o t be derived from theoretical a n a l y s i s b e c a u s e of the high n u m b e r of variables that must be seized in real time, and also many c o m p o n e n t s that are involved in the chemical reactions are e i t h e r u n k n o w n or c a n n o t b e m o n i t o r e d . H o w e v e r , we get s o m e sights on the process by a m a t h e m a t i c a l a n a l y s i s , s e a r c h i n g a r e l a t i o n s h i p from i n p u t / o u t p u t observations (Majdoul et al.

Improved performance can be achieved by adaptive controllers which continuously monitor the time-varying process dynamics and consequently adjust the tuning parameters as required, to optimise the system performance. Various simple dissolved oxygen control systems have been described in the literature, including a control loop utilising an adaptive regulator controlling a stepping motor driver for flow valve positioning [ 3 ] . Kobayashi presented a dissolved oxygen controller using a microcomputer to control both air flow and agitation, however the system required novel apparatus and used a simple proportional controller [ 4 ] .

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