By International Federation of Automatic Control, Heinz Unbehauen

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S. Kershenbaum, and B. E. Ydstie (1981). Implementation of self-tuning regulators with variable forgetting factors. Proc. IEE, 128, Kurz, H. (1979). Digital parameter-adaptive control of processes with unknown constant or timevarying dead time. 5th IFAC Symposium on Identification and System Parameter Estimation, Darmstadt. , R. Isermann, and R. Schumann (1978). Development, comparison and application of various parameter adaptive digital control algorithms. 7th IFAC-Congress, Helsinki. Park, S.

70 '85 Programmed Changes in Feed 240(min) Flow. y " · | ,Μ,ΊΜΙ V\- The first control scheme tested w a s that of a c l a s sical Smith Predictor w i t h P I c o n t r o l l e r , and fixed prediction step. It h a s b e e n documented that this controller's p e r f o r m a n c e degrades w h e n a change in process dead time occurs (Buckley, 1 9 6 4 ) . The experimental results for increasing and decreasing dead time are shown in F i g s . 7 and 8. Fig. In F i g . 6, w e note a gradual degradation in control performance after 1 0 0 m i n u t e s .

E. Bortolotto and S. Bay J0rgensen K: 1 ; " ··»—^i ' : · 7 Γ" Fig. 6. Open loop response to a step in the total mass flow rate. Fig. 7 is an enlargement of the initial part of Fig. 6. T0 . 8 Fig. 2. Open loop response to a step in the inlet temperature. Fig. 3 is an enlargement of the initial part of Fig. 2. _ „ j Fig. 8. Closed loop response to a step disturbance in the inlet temperature. 9 T0 . 8 T0 . 7 feed C. Fig. 9. Closed loop response to a step disturbance in the inlet Oxygen feed. 7 feed Fig.

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