Documents disponibles écrits par cet auteur

Advanced control strategies for the regulation of hypnosis with propofol / Yelneedi Sreenivas in Industrial & engineering chemistry research, Vol. 48 N° 8 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3880–3897 Titre : Advanced control strategies for the regulation of hypnosis with propofol Type de document : texte imprimé Auteurs : Yelneedi Sreenivas, Auteur ; Lakshminarayanan Samavedham, Auteur ; G.P. Rangaiah, Auteur Année de publication : 2009 Article en page(s) : pp. 3880–3897 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hypnosis  Propofol  Bispectral  index  Nonlinear  PK−PD  representation Résumé : Anesthesia implies maintaining a triad of hypnosis, analgesia, and neuromuscular blockade by infusing several drugs which specifically act on each of the above aspects. This work focuses on controlling the hypnosis by automatic infusion of propofol using bispectral index (BIS) as the primary controlled variable. A fourth-order nonlinear pharmacokinetic (PK)−pharmacodynamic (PD) representation is used for the hypnosis dynamics of patients. A reliable PK−PD model with associated parameters is obtained from the literature and the closed-loop responses of four types of control strategies (model predictive control, internal model control, controller with modeling error compensation, and proportional-integral-derivative (PID) control) are compared. Robust performance of the four controllers is tested for a broad range of patients by considering variability in PK−PD parameters. Also, the relative performance of the four controllers is studied for different set-points, noise, and disturbances in BIS signal. Numerical simulations show that all the advanced controllers performed better than the PID controller with the model predictive controller showing the best performance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800695b [article] Advanced control strategies for the regulation of hypnosis with propofol [texte imprimé] / Yelneedi Sreenivas, Auteur ; Lakshminarayanan Samavedham, Auteur ; G.P. Rangaiah, Auteur . - 2009 . - pp. 3880–3897. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3880–3897 Mots-clés : Hypnosis  Propofol  Bispectral  index  Nonlinear  PK−PD  representation Résumé : Anesthesia implies maintaining a triad of hypnosis, analgesia, and neuromuscular blockade by infusing several drugs which specifically act on each of the above aspects. This work focuses on controlling the hypnosis by automatic infusion of propofol using bispectral index (BIS) as the primary controlled variable. A fourth-order nonlinear pharmacokinetic (PK)−pharmacodynamic (PD) representation is used for the hypnosis dynamics of patients. A reliable PK−PD model with associated parameters is obtained from the literature and the closed-loop responses of four types of control strategies (model predictive control, internal model control, controller with modeling error compensation, and proportional-integral-derivative (PID) control) are compared. Robust performance of the four controllers is tested for a broad range of patients by considering variability in PK−PD parameters. Also, the relative performance of the four controllers is studied for different set-points, noise, and disturbances in BIS signal. Numerical simulations show that all the advanced controllers performed better than the PID controller with the model predictive controller showing the best performance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800695b

Application and evaluation of three methodologies for plantwide control of the styrene monomer plant / Suraj Vasudevan in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10941–10961 Titre : Application and evaluation of three methodologies for plantwide control of the styrene monomer plant Type de document : texte imprimé Auteurs : Suraj Vasudevan, Auteur ; G.P. Rangaiah, Auteur ; N. V. S. N. Murthy Konda, Auteur Année de publication : 2010 Article en page(s) : pp. 10941–10961 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Application--Evaluation--Methodologies--Plantwide--Control--Styrene--Monomer--Plant Résumé : Plantwide control (PWC) methodologies have gained significant importance given the high and increasing degree of integration in chemical processes due to material recycle, energy integration, and stringent product quality control, all of which though economically favorable, pose tough challenges to smooth plant operation. As part of the continuing search for more effective PWC system design methods, an integrated framework of heuristics and simulation was proposed [Konda et al. Ind. Eng. Chem. Res. 2005, 44, 8300−8313]. The basic idea behind this development is to make effective use of rigorous process simulators to aid in decision-making during the development of the heuristic-based PWC structure. Konda and co-workers have successfully applied the procedure to the toluene hydrodealkylation process. Though the integrated framework is promising, there is still a need to test its applicability to other complex industrial processes. The present contribution considers the development of a PWC structure for the styrene monomer plant using the integrated framework. In addition, in order to gauge its effectiveness in comparison to the other plantwide control methods, two more methods are considered in this study. First, the heuristics procedure of Luyben and co-workers [Luyben et al. Plant-Wide Process Control; McGraw-Hill: New York, 1998], which is a popular heuristics-based methodology, is also applied to the same flowsheet, and is considered as the base case for performance assessment. Second, the self-optimizing control procedure [Skogestad, S. Comput. Chem. Eng. 2004, 28, 219−234] is also used in order to have a more comprehensive analysis of the effectiveness of the integrated framework. An analysis of the results indicates that while all the procedures give stable control structures, the integrated framework and self-optimizing control procedures give more robust control structures than the heuristics procedure. This is the first study to develop simulation models and complete PWC structures for the styrene plant, together with a detailed analysis of the relative performance of the resulting structures in order to evaluate the different PWC methodologies. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900022h [article] Application and evaluation of three methodologies for plantwide control of the styrene monomer plant [texte imprimé] / Suraj Vasudevan, Auteur ; G.P. Rangaiah, Auteur ; N. V. S. N. Murthy Konda, Auteur . - 2010 . - pp. 10941–10961. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10941–10961 Mots-clés : Application--Evaluation--Methodologies--Plantwide--Control--Styrene--Monomer--Plant Résumé : Plantwide control (PWC) methodologies have gained significant importance given the high and increasing degree of integration in chemical processes due to material recycle, energy integration, and stringent product quality control, all of which though economically favorable, pose tough challenges to smooth plant operation. As part of the continuing search for more effective PWC system design methods, an integrated framework of heuristics and simulation was proposed [Konda et al. Ind. Eng. Chem. Res. 2005, 44, 8300−8313]. The basic idea behind this development is to make effective use of rigorous process simulators to aid in decision-making during the development of the heuristic-based PWC structure. Konda and co-workers have successfully applied the procedure to the toluene hydrodealkylation process. Though the integrated framework is promising, there is still a need to test its applicability to other complex industrial processes. The present contribution considers the development of a PWC structure for the styrene monomer plant using the integrated framework. In addition, in order to gauge its effectiveness in comparison to the other plantwide control methods, two more methods are considered in this study. First, the heuristics procedure of Luyben and co-workers [Luyben et al. Plant-Wide Process Control; McGraw-Hill: New York, 1998], which is a popular heuristics-based methodology, is also applied to the same flowsheet, and is considered as the base case for performance assessment. Second, the self-optimizing control procedure [Skogestad, S. Comput. Chem. Eng. 2004, 28, 219−234] is also used in order to have a more comprehensive analysis of the effectiveness of the integrated framework. An analysis of the results indicates that while all the procedures give stable control structures, the integrated framework and self-optimizing control procedures give more robust control structures than the heuristics procedure. This is the first study to develop simulation models and complete PWC structures for the styrene plant, together with a detailed analysis of the relative performance of the resulting structures in order to evaluate the different PWC methodologies. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900022h

Application and evaluation of three methodologies for plantwide control of the styrene monomer plant / Suraj Vasudevan in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10941–10961 Titre : Application and evaluation of three methodologies for plantwide control of the styrene monomer plant Type de document : texte imprimé Auteurs : Suraj Vasudevan, Auteur ; G.P. Rangaiah, Auteur ; N. V. S. N. Murthy Konda, Auteur Année de publication : 2010 Article en page(s) : pp. 10941–10961 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Plantwide  control  methodologies  Styrene  monomer  plant Résumé : Plantwide control (PWC) methodologies have gained significant importance given the high and increasing degree of integration in chemical processes due to material recycle, energy integration, and stringent product quality control, all of which though economically favorable, pose tough challenges to smooth plant operation. As part of the continuing search for more effective PWC system design methods, an integrated framework of heuristics and simulation was proposed [Konda et al. Ind. Eng. Chem. Res. 2005, 44, 8300−8313]. The basic idea behind this development is to make effective use of rigorous process simulators to aid in decision-making during the development of the heuristic-based PWC structure. Konda and co-workers have successfully applied the procedure to the toluene hydrodealkylation process. Though the integrated framework is promising, there is still a need to test its applicability to other complex industrial processes. The present contribution considers the development of a PWC structure for the styrene monomer plant using the integrated framework. In addition, in order to gauge its effectiveness in comparison to the other plantwide control methods, two more methods are considered in this study. First, the heuristics procedure of Luyben and co-workers [Luyben et al. Plant-Wide Process Control; McGraw-Hill: New York, 1998], which is a popular heuristics-based methodology, is also applied to the same flowsheet, and is considered as the base case for performance assessment. Second, the self-optimizing control procedure [Skogestad, S. Comput. Chem. Eng. 2004, 28, 219−234] is also used in order to have a more comprehensive analysis of the effectiveness of the integrated framework. An analysis of the results indicates that while all the procedures give stable control structures, the integrated framework and self-optimizing control procedures give more robust control structures than the heuristics procedure. This is the first study to develop simulation models and complete PWC structures for the styrene plant, together with a detailed analysis of the relative performance of the resulting structures in order to evaluate the different PWC methodologies. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900022h [article] Application and evaluation of three methodologies for plantwide control of the styrene monomer plant [texte imprimé] / Suraj Vasudevan, Auteur ; G.P. Rangaiah, Auteur ; N. V. S. N. Murthy Konda, Auteur . - 2010 . - pp. 10941–10961. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10941–10961 Mots-clés : Plantwide  control  methodologies  Styrene  monomer  plant Résumé : Plantwide control (PWC) methodologies have gained significant importance given the high and increasing degree of integration in chemical processes due to material recycle, energy integration, and stringent product quality control, all of which though economically favorable, pose tough challenges to smooth plant operation. As part of the continuing search for more effective PWC system design methods, an integrated framework of heuristics and simulation was proposed [Konda et al. Ind. Eng. Chem. Res. 2005, 44, 8300−8313]. The basic idea behind this development is to make effective use of rigorous process simulators to aid in decision-making during the development of the heuristic-based PWC structure. Konda and co-workers have successfully applied the procedure to the toluene hydrodealkylation process. Though the integrated framework is promising, there is still a need to test its applicability to other complex industrial processes. The present contribution considers the development of a PWC structure for the styrene monomer plant using the integrated framework. In addition, in order to gauge its effectiveness in comparison to the other plantwide control methods, two more methods are considered in this study. First, the heuristics procedure of Luyben and co-workers [Luyben et al. Plant-Wide Process Control; McGraw-Hill: New York, 1998], which is a popular heuristics-based methodology, is also applied to the same flowsheet, and is considered as the base case for performance assessment. Second, the self-optimizing control procedure [Skogestad, S. Comput. Chem. Eng. 2004, 28, 219−234] is also used in order to have a more comprehensive analysis of the effectiveness of the integrated framework. An analysis of the results indicates that while all the procedures give stable control structures, the integrated framework and self-optimizing control procedures give more robust control structures than the heuristics procedure. This is the first study to develop simulation models and complete PWC structures for the styrene plant, together with a detailed analysis of the relative performance of the resulting structures in order to evaluate the different PWC methodologies. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900022h

A comprehensive evaluation of PID, cascade, model-predictive, and RTDA controllers for regulation of hypnosis / Yelneedi Sreenivas in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5719–5730 Titre : A comprehensive evaluation of PID, cascade, model-predictive, and RTDA controllers for regulation of hypnosis Type de document : texte imprimé Auteurs : Yelneedi Sreenivas, Auteur ; Tian Woon Yeng, Auteur ; G.P. Rangaiah, Auteur Année de publication : 2009 Article en page(s) : pp. 5719–5730 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Anesthesia  Proportional-integral-derivative  controller  Closed-loop  systems Résumé : Although manual control of anesthesia is still the dominant practice during surgery, an increasing number of studies have been conducted to investigate the possibility of automating this procedure. Several clinical studies that compare closed-loop to manual anesthesia control performance have been reported. These studies used proportional−integral−derivative (PID) controllers, as well as model-based controllers. However, there is a need for a comprehensive evaluation of closed-loop systems, to establish their safety, reliability, and efficacy for anesthesia regulation. This requires a detailed evaluation of promising and/or recent controllers for a range of patients and conditions via simulation. The present study investigates the performance of single-loop PID, cascade, model-predictive, and RTDA (Robustness, set point Tracking, Disturbance rejection, Aggressiveness) controllers for closed-loop regulation of hypnosis using isoflurane with bispectral index (BIS) as the controlled variable. Extensive simulations are performed using a model that simulates patient responses to the drug, surgical stimuli, and unexpected surgical events. Results of this comprehensive evaluation show that model-predictive and RTDA controllers provide better regulation of BIS, compared to the other controllers tested. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800927u [article] A comprehensive evaluation of PID, cascade, model-predictive, and RTDA controllers for regulation of hypnosis [texte imprimé] / Yelneedi Sreenivas, Auteur ; Tian Woon Yeng, Auteur ; G.P. Rangaiah, Auteur . - 2009 . - pp. 5719–5730. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5719–5730 Mots-clés : Anesthesia  Proportional-integral-derivative  controller  Closed-loop  systems Résumé : Although manual control of anesthesia is still the dominant practice during surgery, an increasing number of studies have been conducted to investigate the possibility of automating this procedure. Several clinical studies that compare closed-loop to manual anesthesia control performance have been reported. These studies used proportional−integral−derivative (PID) controllers, as well as model-based controllers. However, there is a need for a comprehensive evaluation of closed-loop systems, to establish their safety, reliability, and efficacy for anesthesia regulation. This requires a detailed evaluation of promising and/or recent controllers for a range of patients and conditions via simulation. The present study investigates the performance of single-loop PID, cascade, model-predictive, and RTDA (Robustness, set point Tracking, Disturbance rejection, Aggressiveness) controllers for closed-loop regulation of hypnosis using isoflurane with bispectral index (BIS) as the controlled variable. Extensive simulations are performed using a model that simulates patient responses to the drug, surgical stimuli, and unexpected surgical events. Results of this comprehensive evaluation show that model-predictive and RTDA controllers provide better regulation of BIS, compared to the other controllers tested. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800927u

Criteria for performance assessment of plantwide control systems / Suraj Vasudevan in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9209–9221 Titre : Criteria for performance assessment of plantwide control systems Type de document : texte imprimé Auteurs : Suraj Vasudevan, Auteur ; G.P. Rangaiah, Auteur Année de publication : 2010 Article en page(s) : pp. 9209–9221 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Plantwide  control  systems Résumé : Performance analysis of plantwide control (PWC) systems, which is one of the important areas of PWC of industrial processes, has not received much attention in the past. In this paper, many measures based on plant dynamics are described and discussed for evaluating the performance of different control structures in the presence of disturbances. These include overall process settling time, dynamic disturbance sensitivity, the total variation in the plant manipulated variables, net variation from the nominal profit, deviation from the production rate target, and the integral absolute error in product purity. These measures are developed and then applied to four alternative control structures of an important industrial process, namely, styrene monomer plant, in order to test their applicability. The results indicate that some of the presented measures are indeed effective in evaluating and comparing different PWC structures. The most important contribution of this paper is the presentation of some clear and easily computable criteria for the performance assessment of PWC systems. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001795 [article] Criteria for performance assessment of plantwide control systems [texte imprimé] / Suraj Vasudevan, Auteur ; G.P. Rangaiah, Auteur . - 2010 . - pp. 9209–9221. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9209–9221 Mots-clés : Plantwide  control  systems Résumé : Performance analysis of plantwide control (PWC) systems, which is one of the important areas of PWC of industrial processes, has not received much attention in the past. In this paper, many measures based on plant dynamics are described and discussed for evaluating the performance of different control structures in the presence of disturbances. These include overall process settling time, dynamic disturbance sensitivity, the total variation in the plant manipulated variables, net variation from the nominal profit, deviation from the production rate target, and the integral absolute error in product purity. These measures are developed and then applied to four alternative control structures of an important industrial process, namely, styrene monomer plant, in order to test their applicability. The results indicate that some of the presented measures are indeed effective in evaluating and comparing different PWC structures. The most important contribution of this paper is the presentation of some clear and easily computable criteria for the performance assessment of PWC systems. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001795

Integrated differential evolution for global optimization and its performance for modeling vapor–liquid equilibrium data / Haibo Zhang in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

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Integrated framework incorporating optimization for plant-wide control of industrial processes / Suraj Vasudevan in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

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Modeling and optimization of a fermentation process integrated with cell recycling and pervaporation for multiple objectives / Shivom Sharma in Industrial & engineering chemistry research, Vol. 51 N° 15 (Avril 2012) 

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Multiobjective optimization of an industrial LPG thermal cracker using a first principles model / S. R. Nabavi in Industrial & engineering chemistry research, Vol. 48 N° 21 (Novembre 2009) 

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Optimal design of a rotating packed bed for VOC stripping from contaminated groundwater / Krishna Gudena in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

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Optimization of recovery processes for multiple economic and environmental objectives / Elaine Su-Qin Lee in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009) 

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Plantwide control system design and performance evaluation for ammonia synthesis process / Chi Zhang in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

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