Title: State and unknown input observer design for a class of non-linear systems: application to a fermentation process

Authors: Mohamed Kamel, Mohamed Chaabane, Abdessattar Chaari, Mondher Farza

Addresses: Automatic Control Unit, National School of Engineers of Sfax, ENIS,Route soukra, km 3.5 – BP. 1173, 3038 Sfax, Tunisia. ' Automatic Control Unit, National School of Engineers of Sfax, ENIS,Route soukra, km 3.5 – BP. 1173, 3038 Sfax, Tunisia. ' Automatic Control Unit, National School of Engineers of Sfax, ENIS,Route soukra, km 3.5 – BP. 1173, 3038 Sfax, Tunisia. ' GREYC – ENSICAEN, 6, Boulevard Maréchal Juin, F-14050 CAEN cedex, France

Abstract: This paper deals with the simultaneous estimation of states and unknown inputs for a class of non-linear systems using only the measured outputs. A high gain non-linear observer is proposed. Besides the usual rank assumptions on the unknown input observers, the unknown inputs and their derivatives are assumed to be uniformly bounded. An application to an alcoholic fermentation process in chemical reactor semi-continuous, Fed-batch, is presented. Observer|s performances are illustrated through the simulation results of the Fed-batch system.

Keywords: nonlinear systems; unknown inputs; high gain observers; fermentation process; observer design; state estimation; alcoholic fermentation; simulation; batch processing.

DOI: 10.1504/IJSCC.2011.039224

International Journal of Systems, Control and Communications, 2011 Vol.3 No.1, pp.34 - 52

Published online: 31 Mar 2015 *

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