Latin Abstract :
In this work, the effect of the estimation structure on the performance and robustness characteristics of a geometric nonlinear
estimator is studied for free-radical continuous solution copolymerization reactors where conversion, composition, average molecular
weight, solid mass fraction, and production rate are inferred from temperature, density, refractive index, volume, and flowrate
measurements. The case study is based on the geometric characterization of the robust detectability property, yielding a set of
admissible estimator structures that represent a degree of freedom in the estimator design. The choice of structure determines the
estimator reconstruction rate and error propagation mechanism. Measures of estimability (i.e., robust detectability) are introduced
to discriminate structures. The estimator functioning results confirm the ones drawn from the structural assessment stage, and yield
that the best estimator behavior is attained with a structure different from the nominal detectability structure that underlies the
nonlinear fixed-structure EKF and Luenberger techniques employed in previous polymer reactor estimation studies.
NaturalLanguageKeyword :
Polymer reactor , Observability structure , Detectability measures , nonlinear detector , Detectability structure , Robustdetector , Chemical processes
