Documents disponibles écrits par cet auteur

Control and monitoring of a high recovery reverse osmosis desalination process / Charles W. McFall in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6698–6710 Titre : Control and monitoring of a high recovery reverse osmosis desalination process Type de document : texte imprimé Auteurs : Charles W. McFall, Auteur ; Alex Bartman, Auteur ; Panagiotis D. Christofides, Auteur Année de publication : 2008 Article en page(s) : p. 6698–6710 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Osmosis  desalination  process  Fault-tolerant  contro  Fault  detection  isolation  Lyapunov-based  control Résumé : Model-based control and monitoring such as feed-forward/feedback control, fault detection and isolation (FDI), and fault-tolerant control (FTC) techniques that utilize Lyapunov-based control laws are implemented on a high recovery reverse osmosis desalination plant model. A detailed mathematical model of a high recovery reverse osmosis plant is developed. This model incorporates the large spatial variations of concentration and flow rate that occur in membrane units during high recovery operation. Bounded nonlinear feedback and feed-forward controllers are developed and applied to this system. The application of these controllers with FDI and FTC is demonstrated in the context of a high recovery reverse osmosis process simulation. The first set of simulations demonstrates the ability to compensate for the effects of large time-varying disturbances in the feed concentration on specific process outputs with and without feed-forward control. The second set of simulations demonstrates the ability of FDI and FTC techniques to recover desired plant operation subject to actuator failures. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071559b [article] Control and monitoring of a high recovery reverse osmosis desalination process [texte imprimé] / Charles W. McFall, Auteur ; Alex Bartman, Auteur ; Panagiotis D. Christofides, Auteur . - 2008 . - p. 6698–6710. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6698–6710 Mots-clés : Osmosis  desalination  process  Fault-tolerant  contro  Fault  detection  isolation  Lyapunov-based  control Résumé : Model-based control and monitoring such as feed-forward/feedback control, fault detection and isolation (FDI), and fault-tolerant control (FTC) techniques that utilize Lyapunov-based control laws are implemented on a high recovery reverse osmosis desalination plant model. A detailed mathematical model of a high recovery reverse osmosis plant is developed. This model incorporates the large spatial variations of concentration and flow rate that occur in membrane units during high recovery operation. Bounded nonlinear feedback and feed-forward controllers are developed and applied to this system. The application of these controllers with FDI and FTC is demonstrated in the context of a high recovery reverse osmosis process simulation. The first set of simulations demonstrates the ability to compensate for the effects of large time-varying disturbances in the feed concentration on specific process outputs with and without feed-forward control. The second set of simulations demonstrates the ability of FDI and FTC techniques to recover desired plant operation subject to actuator failures. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071559b

Fault detection and isolation for nonlinear process systems using asynchronous measurements / Charles W. McFall ; David Muñoz de la Peña ; Ben Ohran in Industrial & engineering chemistry research, Vol. 47 n°24 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 10009–10019 Titre : Fault detection and isolation for nonlinear process systems using asynchronous measurements Type de document : texte imprimé Auteurs : Charles W. McFall, Auteur ; David Muñoz de la Peña, Auteur ; Ben Ohran, Auteur Année de publication : 2009 Article en page(s) : p. 10009–10019 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : (FDI)  scheme  Isolation  for  Nonlinear  Process  Systems Résumé : This work addresses the problem of fault detection and isolation for nonlinear processes when some process variable measurements are available at regular sampling intervals and the remaining process variables are measured at an asynchronous rate. First, a fault detection and isolation (FDI) scheme that employs model-based techniques is proposed that allows for the isolation of faults. The proposed FDI scheme provides detection and isolation of any fault that enters into the differential equation of only synchronously measured states and grouping of faults that enter into the differential equation of any asynchronously measured state. For a fully coupled process system, fault detection occurs shortly after a fault takes place, and fault isolation, limited by the arrival of asynchronous measurements, occurs when asynchronous measurements become available. Fault-tolerant control methods with a supervisory control component are then employed to achieve stability in the presence of actuator failures using control system reconfiguration. Numerical simulations of a polyethylene reactor are performed to demonstrate the applicability and performance of the proposed fault detection and isolation and fault-tolerant control method in the presence of asynchronous measurements. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801056y [article] Fault detection and isolation for nonlinear process systems using asynchronous measurements [texte imprimé] / Charles W. McFall, Auteur ; David Muñoz de la Peña, Auteur ; Ben Ohran, Auteur . - 2009 . - p. 10009–10019. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 10009–10019 Mots-clés : (FDI)  scheme  Isolation  for  Nonlinear  Process  Systems Résumé : This work addresses the problem of fault detection and isolation for nonlinear processes when some process variable measurements are available at regular sampling intervals and the remaining process variables are measured at an asynchronous rate. First, a fault detection and isolation (FDI) scheme that employs model-based techniques is proposed that allows for the isolation of faults. The proposed FDI scheme provides detection and isolation of any fault that enters into the differential equation of only synchronously measured states and grouping of faults that enter into the differential equation of any asynchronously measured state. For a fully coupled process system, fault detection occurs shortly after a fault takes place, and fault isolation, limited by the arrival of asynchronous measurements, occurs when asynchronous measurements become available. Fault-tolerant control methods with a supervisory control component are then employed to achieve stability in the presence of actuator failures using control system reconfiguration. Numerical simulations of a polyethylene reactor are performed to demonstrate the applicability and performance of the proposed fault detection and isolation and fault-tolerant control method in the presence of asynchronous measurements. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801056y