Documents disponibles écrits par cet auteur

Analysis of interaction effects on plantwide operability / Ridwan Setiawan in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8585-8602 Titre : Analysis of interaction effects on plantwide operability Type de document : texte imprimé Auteurs : Ridwan Setiawan, Auteur ; Jie Bao, Auteur Année de publication : 2011 Article en page(s) : pp. 8585-8602 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Plantwide  Chemical  processes Résumé : Modem chemical plants are complex and consist of many process units interconnected in various configurations (e.g., recycle, bypass, and heat integration). Because of these interconnections, the unit interactions often impose limitations on the plantwide operability of chemical processes, especially on the performance of decentralized controller. In this article, a plantwide operability analysis approach that explicitly considers the interactions based on network perspective is presented. It provides a uniform framework for the assessment of plantwide stability, stabilizability, and achievable dynamic performance in the case of regulatory control using the concept of dissipative systems. To focus on the effects of process dynamics and the interaction between subsystems on the plantwide operability, this analysis was developed with the assumption of state-feedback control. The above analysis problem involves linear matrix inequalities (LMIs), which are convex and easy to solve. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346899 [article] Analysis of interaction effects on plantwide operability [texte imprimé] / Ridwan Setiawan, Auteur ; Jie Bao, Auteur . - 2011 . - pp. 8585-8602. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8585-8602 Mots-clés : Plantwide  Chemical  processes Résumé : Modem chemical plants are complex and consist of many process units interconnected in various configurations (e.g., recycle, bypass, and heat integration). Because of these interconnections, the unit interactions often impose limitations on the plantwide operability of chemical processes, especially on the performance of decentralized controller. In this article, a plantwide operability analysis approach that explicitly considers the interactions based on network perspective is presented. It provides a uniform framework for the assessment of plantwide stability, stabilizability, and achievable dynamic performance in the case of regulatory control using the concept of dissipative systems. To focus on the effects of process dynamics and the interaction between subsystems on the plantwide operability, this analysis was developed with the assumption of state-feedback control. The above analysis problem involves linear matrix inequalities (LMIs), which are convex and easy to solve. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346899

Control of chemical processes via output feedback controller networks / Shichao Xu in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7421–7445 Titre : Control of chemical processes via output feedback controller networks Type de document : texte imprimé Auteurs : Shichao Xu, Auteur ; Jie Bao, Auteur Année de publication : 2010 Article en page(s) : pp. 7421–7445 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Chemical  Processes Résumé : Many modern chemical plants are complex systems consisting of a large number of process units. The interactions between these units often intensify the complexity of large scale plantwide systems and cause significant difficulties in plantwide process control. This paper aims to address these issues by developing a networked control approach. The plantwide process is modeled as a network of process units connected via mass and energy flow. A network of output feedback distributed controllers are then designed to control the process network. Using the concept of dissipativity, plantwide stability and global performance requirement are translated into dissipativity conditions for which each output feedback control system has to satisfy. This allows controllers to be designed and implemented independently. In this framework, the plantwide connective stability is established to ensure the stability of the plant even when communications between controllers break down. This leads to improved reliability and fault tolerance. The effectiveness of the proposed linear control approach is demonstrated in a case study of a process network that consists of a reactor and two multistage distillation columns. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901768q [article] Control of chemical processes via output feedback controller networks [texte imprimé] / Shichao Xu, Auteur ; Jie Bao, Auteur . - 2010 . - pp. 7421–7445. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7421–7445 Mots-clés : Chemical  Processes Résumé : Many modern chemical plants are complex systems consisting of a large number of process units. The interactions between these units often intensify the complexity of large scale plantwide systems and cause significant difficulties in plantwide process control. This paper aims to address these issues by developing a networked control approach. The plantwide process is modeled as a network of process units connected via mass and energy flow. A network of output feedback distributed controllers are then designed to control the process network. Using the concept of dissipativity, plantwide stability and global performance requirement are translated into dissipativity conditions for which each output feedback control system has to satisfy. This allows controllers to be designed and implemented independently. In this framework, the plantwide connective stability is established to ensure the stability of the plant even when communications between controllers break down. This leads to improved reliability and fault tolerance. The effectiveness of the proposed linear control approach is demonstrated in a case study of a process network that consists of a reactor and two multistage distillation columns. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901768q

Dynamic operability analysis for stable and unstable linear processes / Herry Santoso in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4765–4774 Titre : Dynamic operability analysis for stable and unstable linear processes Type de document : texte imprimé Auteurs : Herry Santoso, Auteur ; Jie Bao, Auteur ; Peter L. Lee, Auteur Année de publication : 2008 Article en page(s) : p. 4765–4774 Langues : Anglais (eng) Mots-clés : Passive  systems;  Nonpassive  process;  Input  feedforward  passivity;  Output  feedback  passivity Résumé : Dynamic operability analysis determines the achievable control performance for a given process. Based on open-loop models, such analysis is useful in revealing controllability problems in the early process design stages. This paper presents a new approach to dynamic operability analysis based on the concept of passive systems. It is well-known that passive systems are very easy to control. The lack of passivity of a nonpassive process can be quantified by using an input feedforward passivity (IFP) or an output feedback passivity (OFP) index, which measures how much feedforward/feedback is required to render the process passive. A nonminimum phase stable process usually has a shortage of IFP and thus needs a controller with an excessive OFP to ensure closed-loop stability. Excessive OFP of the controller represents the upper limit of the controller gain. Therefore, the shortage of IFP of a stable process can be used to determine its achievable performance. This analysis is then extended to unstable processes using coprime factorization. Numerical methods for dynamic operability analysis for both stable and unstable processes are developed in this paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070599c [article] Dynamic operability analysis for stable and unstable linear processes [texte imprimé] / Herry Santoso, Auteur ; Jie Bao, Auteur ; Peter L. Lee, Auteur . - 2008 . - p. 4765–4774. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4765–4774 Mots-clés : Passive  systems;  Nonpassive  process;  Input  feedforward  passivity;  Output  feedback  passivity Résumé : Dynamic operability analysis determines the achievable control performance for a given process. Based on open-loop models, such analysis is useful in revealing controllability problems in the early process design stages. This paper presents a new approach to dynamic operability analysis based on the concept of passive systems. It is well-known that passive systems are very easy to control. The lack of passivity of a nonpassive process can be quantified by using an input feedforward passivity (IFP) or an output feedback passivity (OFP) index, which measures how much feedforward/feedback is required to render the process passive. A nonminimum phase stable process usually has a shortage of IFP and thus needs a controller with an excessive OFP to ensure closed-loop stability. Excessive OFP of the controller represents the upper limit of the controller gain. Therefore, the shortage of IFP of a stable process can be used to determine its achievable performance. This analysis is then extended to unstable processes using coprime factorization. Numerical methods for dynamic operability analysis for both stable and unstable processes are developed in this paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070599c