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Decentralized control system design for MIMO processes with integrators / differentiators / Wuhua Hu 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. 12521–12528 Titre : Decentralized control system design for MIMO processes with integrators / differentiators Type de document : texte imprimé Auteurs : Wuhua Hu, Auteur ; Wen-Jian Cai, Auteur ; Gaoxi Xiao, Auteur Année de publication : 2011 Article en page(s) : pp. 12521–12528 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : MIMO  processes  integrators Résumé : This work extends the concept of relative normalized gain array (RNGA) and proposes a systematic approach to designing decentralized proportional−integral−derivative (PID) control for multi-input−multi-output (MIMO) processes containing integrators and/or differentiators. By determining the input−output-pairing using the relative gain array (RGA)−Nederlinski index (NI)−RNGA criterion, equivalent transfer functions (ETFs) for the selected input−output pairs are derived by utilizing the RGA and RNGA information, which has incorporated the information on loop interactions. Based on the ETFs, decentralized PID controllers are tuned to stabilize the MIMO system independently. The proposed approach is simple, easy to understand, and easy to implement by field engineers. Three industrial MIMO processes with different dimensions and interaction modes are employed to demonstrate the efficiency of the proposed approach. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1005838 [article] Decentralized control system design for MIMO processes with integrators / differentiators [texte imprimé] / Wuhua Hu, Auteur ; Wen-Jian Cai, Auteur ; Gaoxi Xiao, Auteur . - 2011 . - pp. 12521–12528. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12521–12528 Mots-clés : MIMO  processes  integrators Résumé : This work extends the concept of relative normalized gain array (RNGA) and proposes a systematic approach to designing decentralized proportional−integral−derivative (PID) control for multi-input−multi-output (MIMO) processes containing integrators and/or differentiators. By determining the input−output-pairing using the relative gain array (RGA)−Nederlinski index (NI)−RNGA criterion, equivalent transfer functions (ETFs) for the selected input−output pairs are derived by utilizing the RGA and RNGA information, which has incorporated the information on loop interactions. Based on the ETFs, decentralized PID controllers are tuned to stabilize the MIMO system independently. The proposed approach is simple, easy to understand, and easy to implement by field engineers. Three industrial MIMO processes with different dimensions and interaction modes are employed to demonstrate the efficiency of the proposed approach. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1005838

Multivariable process control / Shen, Yuling in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 761–771 Titre : Multivariable process control : decentralized, decoupling, or sparse? Type de document : texte imprimé Auteurs : Shen, Yuling, Auteur ; Wen-Jian Cai, Auteur ; Shaoyuan Li, Auteur Année de publication : 2010 Article en page(s) : pp 761–771 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Multivariable  control  PID  Industrial  processes  Decoupling. Résumé : In this article, a systematic approach is proposed to design PI-/PID-based multivariable control systems in which the designs and analyses of decentralized, decoupling, and sparse control schemes are all treated under a unified framework. First, based on the relative normalized gain array (RNGA), a best loop pairing is obtained using the RGA (relative gain array)−Nederlinski index (NI)−RNGA rules. The index matrix is then calculated, and the control structure is determined according to a selection criterion. Finally, the selected loop controllers are independently designed based on equivalent transfer functions. The effectiveness of the proposed design approach is verified by analysis of several multivariable industrial processes, demonstrating that the selected control structure results in better overall system performance. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901453z#afn1 [article] Multivariable process control : decentralized, decoupling, or sparse? [texte imprimé] / Shen, Yuling, Auteur ; Wen-Jian Cai, Auteur ; Shaoyuan Li, Auteur . - 2010 . - pp 761–771. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 761–771 Mots-clés : Multivariable  control  PID  Industrial  processes  Decoupling. Résumé : In this article, a systematic approach is proposed to design PI-/PID-based multivariable control systems in which the designs and analyses of decentralized, decoupling, and sparse control schemes are all treated under a unified framework. First, based on the relative normalized gain array (RNGA), a best loop pairing is obtained using the RGA (relative gain array)−Nederlinski index (NI)−RNGA rules. The index matrix is then calculated, and the control structure is determined according to a selection criterion. Finally, the selected loop controllers are independently designed based on equivalent transfer functions. The effectiveness of the proposed design approach is verified by analysis of several multivariable industrial processes, demonstrating that the selected control structure results in better overall system performance. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901453z#afn1

Normalized decoupling / Wen-Jian Cai in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7347–7356 Titre : Normalized decoupling : a new approach for MIMO process control system design Type de document : texte imprimé Auteurs : Wen-Jian Cai, Auteur ; Wei Ni, Auteur ; Mao-Jun He, Auteur Année de publication : 2008 Article en page(s) : p. 7347–7356 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Decoupling  control  system  Two-input  process  Two-output  process Résumé : In this paper, a novel engineering oriented decoupling control system design method for two-input, two-output processes is presented. By employing the concept of integrated error, gain and phase changes of a transfer function when other loops are closed can be uniquely determined. Consequently, an equivalent transfer function matrix for a closed-loop control system can be obtained and its relations with the original process transfer function matrix are derived. On the basis of the equivalent transfer function matrix, parameters of a stable, proper, and causal ideal diagonal decoupler can then be easily determined by proper parameter assignments of the decoupled transfer function matrix elements. The method avoids the drawbacks of existing decoupling schemes, is very simple and can be easily understood, and can be implemented by field control engineers. An industrial process is employed to demonstrate its simplicity in design and effectiveness in control system performance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006165 [article] Normalized decoupling : a new approach for MIMO process control system design [texte imprimé] / Wen-Jian Cai, Auteur ; Wei Ni, Auteur ; Mao-Jun He, Auteur . - 2008 . - p. 7347–7356. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7347–7356 Mots-clés : Decoupling  control  system  Two-input  process  Two-output  process Résumé : In this paper, a novel engineering oriented decoupling control system design method for two-input, two-output processes is presented. By employing the concept of integrated error, gain and phase changes of a transfer function when other loops are closed can be uniquely determined. Consequently, an equivalent transfer function matrix for a closed-loop control system can be obtained and its relations with the original process transfer function matrix are derived. On the basis of the equivalent transfer function matrix, parameters of a stable, proper, and causal ideal diagonal decoupler can then be easily determined by proper parameter assignments of the decoupled transfer function matrix elements. The method avoids the drawbacks of existing decoupling schemes, is very simple and can be easily understood, and can be implemented by field control engineers. An industrial process is employed to demonstrate its simplicity in design and effectiveness in control system performance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006165