Documents disponibles écrits par cet auteur

Design of reactor–separator–recycle systems based on the optimization of estimations of the domain of attraction / Luis G. Matallana in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) Titre : Design of reactor–separator–recycle systems based on the optimization of estimations of the domain of attraction Type de document : texte imprimé Auteurs : Luis G. Matallana, Auteur ; Anibal M. Blanco, Auteur ; J. Alberto Bandoni, Auteur Année de publication : 2011 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Reactor  separator  recycle  Estimations  attraction Résumé : In this paper, an optimization-based methodology is applied to the design of a reactor–separator–recycle system based on a measure of the extension of the domain of attraction of the operating equilibrium. The approach consists in maximizing the radius of a ball in the state space contained in the region of negative definiteness of the time derivative of a quadratic Lyapunov function. A two-level optimization strategy is proposed that solves a deterministic nonconvex global optimization problem at the inner level. To cope with the non-differentiability introduced by the inner problem, we applied a stochastic algorithm to manipulate the design variables at the outer level. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102326n [article] Design of reactor–separator–recycle systems based on the optimization of estimations of the domain of attraction [texte imprimé] / Luis G. Matallana, Auteur ; Anibal M. Blanco, Auteur ; J. Alberto Bandoni, Auteur . - 2011. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) Mots-clés : Reactor  separator  recycle  Estimations  attraction Résumé : In this paper, an optimization-based methodology is applied to the design of a reactor–separator–recycle system based on a measure of the extension of the domain of attraction of the operating equilibrium. The approach consists in maximizing the radius of a ball in the state space contained in the region of negative definiteness of the time derivative of a quadratic Lyapunov function. A two-level optimization strategy is proposed that solves a deterministic nonconvex global optimization problem at the inner level. To cope with the non-differentiability introduced by the inner problem, we applied a stochastic algorithm to manipulate the design variables at the outer level. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102326n

Improving the computational performance of STN / RTN formulations for short - term scheduling / Guillermo A. Durand in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12477-12495 Titre : Improving the computational performance of STN / RTN formulations for short - term scheduling Type de document : texte imprimé Auteurs : Guillermo A. Durand, Auteur ; J. Alberto Bandoni, Auteur Année de publication : 2011 Article en page(s) : pp. 12477-12495 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Scheduling  Short  term Résumé : In this article, we present a series of integer cuts to improve the computational performance of scheduling problems based on either discrete- or continuous-time representation. They are expressed as novel equations in terms of binary variables alone that take advantage of structural characteristic of general STN and RTN formulations. Different fixed pairs of tasks appearing in scheduling problems of continuous and batch-continuous processes are identified, and corresponding integer cuts are developed to improve the solution efficiency of the mathematical formulations. For demonstration purposes, five selected scheduling formulations are modified as proposed in this article and applied to three well-known benchmark problems, and their computational performances are compared against the unmodified formulations. An industrial case study is also used to demonstrate the advantages of using the new equations. This case study corresponds to a sector, the so-called "sugarhouse", of a beet sugar plant. The scheduling model is presented, and the results are discussed in terms of both the optimal plant schedule and the computational point of view. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23692003 [article] Improving the computational performance of STN / RTN formulations for short - term scheduling [texte imprimé] / Guillermo A. Durand, Auteur ; J. Alberto Bandoni, Auteur . - 2011 . - pp. 12477-12495. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12477-12495 Mots-clés : Scheduling  Short  term Résumé : In this article, we present a series of integer cuts to improve the computational performance of scheduling problems based on either discrete- or continuous-time representation. They are expressed as novel equations in terms of binary variables alone that take advantage of structural characteristic of general STN and RTN formulations. Different fixed pairs of tasks appearing in scheduling problems of continuous and batch-continuous processes are identified, and corresponding integer cuts are developed to improve the solution efficiency of the mathematical formulations. For demonstration purposes, five selected scheduling formulations are modified as proposed in this article and applied to three well-known benchmark problems, and their computational performances are compared against the unmodified formulations. An industrial case study is also used to demonstrate the advantages of using the new equations. This case study corresponds to a sector, the so-called "sugarhouse", of a beet sugar plant. The scheduling model is presented, and the results are discussed in terms of both the optimal plant schedule and the computational point of view. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23692003