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Adaptive multirate state and parameter estimation strategies with application to a bioreactor
Author(s) -
Gudi Ravindra D.,
Shah Sirish L.,
Gray Murray R.
Publication year - 1995
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.690411111
Subject(s) - observability , kalman filter , control theory (sociology) , estimator , process (computing) , iterated function , estimation theory , computer science , state (computer science) , moving horizon estimation , extended kalman filter , mathematical optimization , control engineering , mathematics , engineering , algorithm , control (management) , statistics , mathematical analysis , artificial intelligence , operating system
The design and development of a mu8ltirate software sensor for use in the chemical process industry are presented. The measurements of process outputs that arrive at different sampling rates are formally accommodated into the estimation strategy by using rhwe multirate formulation of the iterated extended kalman filter. Measurement delays associated with some of the process outputs are included in the system description by addition of delayed states. Observability issues associated with state and parameter estimation in a multirate framework are discussed and modified measurement equations are proposed for systems with delayed measurements to ensure relatively “strong” system observability. The evaluation of the proposed multirate state and parameter estimator through simulations and an experimental application on afed batch fermentation system gave satisfactory performance.