Multirate nonlinear state estimation with application to a polymerization reactor
✍ Scribed by Srinivas Tatiraju; Masoud Soroush; Babatunde A. Ogunnaike
- Publisher
- American Institute of Chemical Engineers
- Year
- 1999
- Tongue
- English
- Weight
- 170 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0001-1541
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✦ Synopsis
A method of multirate nonlinear state obser®er design, which can use directly a nonlinear process model in the obser®er design without any linear approximation, is presented. The multirate nonlinear state obser®er is easy to design and implement, and is computationally efficient. Furthermore, for a number of processes, it is possible to pro®e the global con®ergence of the multirate state obser®er analytically. The design, implementation and performance of the state obser®er design method are shown by a polymerization reactor in which free-radical solution polymerization of styrene takes place. The initiator concentration and three leading moments of the molecular weight distribu-( ) () tion MWD of the polymer product are estimated continuously from: i frequent measurements of the reactor temperature, jacket temperature and reacting-mixture density; ( ) ii infrequent and delayed measurements of the leading moments of the MWD. Each infrequent measurement has a sampling period and a measurement delay of 0.5 or 1 h.
In the presence of model-plant mismatch and measurement noise, the con®ergence of the multirate state obser®er is shown by numerical simulations.