Abstract
This paper investigates various methods for controlling a nonlinear process based on the approximation of the original nonlinear system. We start with a polynomial approximation of the nonlinear model and explore the implementation of exact and approximate linearization techniques to develop controllers with varying degrees of sophistication. A case study of a continuous stirred tank reactor provides the basis for evaluating the performance of the closed-loop system under linear controllers, polynomial-type controllers, and the controllers developed through global linearization techniques.
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