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Identification and adaptation in control loops with time varying gain
Author(s) -
Mellichamp D. A.,
Coughanowr D. R.,
Koppel L. B.
Publication year - 1966
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690120117
Subject(s) - identification (biology) , control theory (sociology) , process (computing) , identifier , adaptive control , automatic gain control , control system , process gain , system identification , computer science , process control , control (management) , adaptation (eye) , control engineering , engineering , artificial intelligence , data modeling , channel (broadcasting) , amplifier , computer network , bandwidth (computing) , optics , biology , operating system , programming language , spread spectrum , botany , physics , electrical engineering , database
A method is presented to apply the gain identification procedures developed in a companion paper to a control system. The method employs a small identification tank which follows the control tank; the identification tank is perturbed to estimate the gain of the process (controlled tank system). The effects of load changes on the identification system are minimized by this approach. The results of analog and digital computer simulations of this adaptive process are given. Both a general system with linear change in gain and a p H control system with a step change in concentration of the buffer species are studied. Process gain changes up to 20:1 are introduced. It is concluded that an adaptive control system of this type can be designed to maintain good control characteristics in a process experiencing wide gain variation. Criteria are presented to aid in the design of an adequate identifier.