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]  inIndustrial & 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

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