Smooth sliding-mode observers for specific growth rate and substrate from biomass measurement
Título | Smooth sliding-mode observers for specific growth rate and substrate from biomass measurement |
Tipo de Publicación | Journal Article |
Año de Publicación | 2009 |
Autores | Picó J, De Battista H, Garelli F |
Journal | Journal of Process Control |
Volumen | 19 |
Páginas | 1314-1323 |
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 and concepts of variable structure systems. 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 vicinity of the real substrate concentration while achieving asymptotic convergence despite kinetic model uncertainties in properly excited processes is designed. This observer also exhibits first-order dynamics. © 2009 Elsevier Ltd. All rights reserved. |
URL | http://www.scopus.com/inward/record.url?eid=2-s2.0-70249132897&partnerID=40&md5=c62475aecf0ddcdbe3fc78e750190074 |