Documents disponibles écrits par cet auteur

Applicability of desirability function for control structure design in the frequency domain / Maté Haragovics in Industrial & engineering chemistry research, Vol. 51 N° 49 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 16007-16015 Titre : Applicability of desirability function for control structure design in the frequency domain Type de document : texte imprimé Auteurs : Maté Haragovics, Auteur ; Hajnalka Kencse, Auteur ; Péter Mizsey, Auteur Année de publication : 2013 Article en page(s) : pp. 16007-16015 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Design Résumé : In this work, the application of desirability function on controllability indices in the frequency domain is studied and a methodology is presented for its proper application. To design control structures, controllability indices are often used. Different indices represent different controllability attributes of the investigated system or systems; thus, their results might not be in agreement. With the desirability function, it is possible, however, to aggregate the different indices and a final ranking can be obtained, which may substitute time domain studies. Two different fields are examined: control structure variable pairing and selecting a distillation scheme that shows the best controllability features. On one hand, for the variable pairing step of the control structure design, the methodology does not deliver acceptable results, because controllability indices prove to be inaccurate in such cases on which the calculation is based. On the other hand, the methodology delivers similar result for the selection of the right distillation scheme from the controllability point of view to that of the load rejection investigations. This result shows the right area for the applicability of the methodology based on the desirability function. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732126 [article] Applicability of desirability function for control structure design in the frequency domain [texte imprimé] / Maté Haragovics, Auteur ; Hajnalka Kencse, Auteur ; Péter Mizsey, Auteur . - 2013 . - pp. 16007-16015. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 16007-16015 Mots-clés : Design Résumé : In this work, the application of desirability function on controllability indices in the frequency domain is studied and a methodology is presented for its proper application. To design control structures, controllability indices are often used. Different indices represent different controllability attributes of the investigated system or systems; thus, their results might not be in agreement. With the desirability function, it is possible, however, to aggregate the different indices and a final ranking can be obtained, which may substitute time domain studies. Two different fields are examined: control structure variable pairing and selecting a distillation scheme that shows the best controllability features. On one hand, for the variable pairing step of the control structure design, the methodology does not deliver acceptable results, because controllability indices prove to be inaccurate in such cases on which the calculation is based. On the other hand, the methodology delivers similar result for the selection of the right distillation scheme from the controllability point of view to that of the load rejection investigations. This result shows the right area for the applicability of the methodology based on the desirability function. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732126

Decomposability of the control structure design problem of recycle systems / Marcell Horvath in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6339–6345 Titre : Decomposability of the control structure design problem of recycle systems Type de document : texte imprimé Auteurs : Marcell Horvath, Auteur ; Péter Mizsey, Auteur Année de publication : 2009 Article en page(s) : pp. 6339–6345 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Control  structure  design  Whole  process  simultaneously Résumé : The control structure design is an important part of process synthesis tasks. The design becomes more difficult if recycle is present in the process to be controlled. The objective of this work is to clear up if the control structure design should be completed for the whole process simultaneously or it can be decomposed into subproblems involving only one unit of the whole system. Investigations show that the recycle can have an effect on the control structure that complicates the design problem. Simple case studies and exhaustive investigation of the industrial control problem are completed. Our investigations prove that decomposability can be applied simplifying the proper pairing of the controlled and manipulated variables, and this can facilitate the control structure design problem. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800976v [article] Decomposability of the control structure design problem of recycle systems [texte imprimé] / Marcell Horvath, Auteur ; Péter Mizsey, Auteur . - 2009 . - pp. 6339–6345. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6339–6345 Mots-clés : Control  structure  design  Whole  process  simultaneously Résumé : The control structure design is an important part of process synthesis tasks. The design becomes more difficult if recycle is present in the process to be controlled. The objective of this work is to clear up if the control structure design should be completed for the whole process simultaneously or it can be decomposed into subproblems involving only one unit of the whole system. Investigations show that the recycle can have an effect on the control structure that complicates the design problem. Simple case studies and exhaustive investigation of the industrial control problem are completed. Our investigations prove that decomposability can be applied simplifying the proper pairing of the controlled and manipulated variables, and this can facilitate the control structure design problem. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800976v

A methodology to determine controllability indices in the frequency domain / Mate Gabor 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. 4807–4816 Titre : A methodology to determine controllability indices in the frequency domain Type de document : texte imprimé Auteurs : Mate Gabor, Auteur ; Péter Mizsey, Auteur Année de publication : 2008 Article en page(s) : p. 4807–4816 Langues : Anglais (eng) Mots-clés : Frequency  domain  --  controllability  indices;  Open  loop  simulations;  State  space  representation Résumé : The control structure design is an important step of process synthesis. This activity can be supported with controllability indices of the process to be designed. Existing methods to calculate these indices are very complicated and time consuming. In this article, a methodology is presented for the simple determination of controllability indices in the frequency domain. With this methodology, the process of making open loop simulations to approximate transfer function matrices can be avoided. The results obtained can be used to evaluate different control structures. The methodology uses the Control Design Interface module of Aspen Dynamics to describe the system with the linear state space representation. The state space representation can be transferred into Matlab that is used to calculate the controllability indices in the function of frequency from the matrices transferred. The methodology is introduced on two thermally coupled distillation systems (side-stream stripper, SS, and side-stream rectifier, SR). The results show that the methodology is well applicable. The SS has better controllability properties than the SR if the BC separation is easier than AB. In the other cases the SR is better. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070952e [article] A methodology to determine controllability indices in the frequency domain [texte imprimé] / Mate Gabor, Auteur ; Péter Mizsey, Auteur . - 2008 . - p. 4807–4816. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4807–4816 Mots-clés : Frequency  domain  --  controllability  indices;  Open  loop  simulations;  State  space  representation Résumé : The control structure design is an important step of process synthesis. This activity can be supported with controllability indices of the process to be designed. Existing methods to calculate these indices are very complicated and time consuming. In this article, a methodology is presented for the simple determination of controllability indices in the frequency domain. With this methodology, the process of making open loop simulations to approximate transfer function matrices can be avoided. The results obtained can be used to evaluate different control structures. The methodology uses the Control Design Interface module of Aspen Dynamics to describe the system with the linear state space representation. The state space representation can be transferred into Matlab that is used to calculate the controllability indices in the function of frequency from the matrices transferred. The methodology is introduced on two thermally coupled distillation systems (side-stream stripper, SS, and side-stream rectifier, SR). The results show that the methodology is well applicable. The SS has better controllability properties than the SR if the BC separation is easier than AB. In the other cases the SR is better. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070952e