INVESTIGADORES
DE BATTISTA Hernan
artículos
Título:
Smooth sliding-mode observers for specific growth rate and substrate from biomass measurement
Autor/es:
PICÓ, J.; DE BATTISTA, H.; GARELLI, F.
Revista:
JOURNAL OF PROCESS CONTROL
Editorial:
Elsevier Science Ltd
Referencias:
Lugar: Amsterdam; Año: 2009 vol. 19 p. 1314 - 1323
ISSN:
0959-1524
Resumen:
This paper addresses the estimation of specific growth rate and substrate concentration from biomass measurements in fermentation processes. Specifically, sliding mode observers are proposed, for which finite-time global convergence is demonstrated using Lyapunov stability theory. Two observers are developed for specific growth rate estimation, one producing a discontinuous estimation which is used afterwards for substrate estimation, and the other one -based on high-gain observers- that generates a smooth estimation with first-order dynamics and finite-time bounded convergence error. In the case of substrate estimation, an observer that increases the convergence rate to a vecinity of the real substrate concentration, while achieving asymptotic convergence despite kinetic model uncertainties in properly excited processes is designed.
