Application of affine gray-box neural models for nonlinear control of chemical processes

Document Type : Full article

Authors

Electrical Engineering Department, Tarbiat Modarres University, Tehran, Iran

Abstract
 In this paper, an affine neural model is used to model the unknown part of SISO processes with un-modeled actuator dynamics. It is assumed that a partially known first principlesbased model of the process, which is invertible with respect to the unknown part, is available. Using this available knowledge, I/O training data of the process, and affine neural networks, a serial gray-box model is generated which is suitable for applying feedback linearization. Hence, the resulting nonlinear controller works in a large operating region. The superiority of the gray-box over the black-box approach is investigated for a fermentor using the experimental data borrowed from the literature. Simulation results of our case study show that the proposed affzne gray-box method is superior to the conventional agfine black-box method and preserves extrapolation property.

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