Documents disponibles écrits par cet auteur

Adaptive robust control for servo mechanisms with partially unknown states via dynamic surface control approach / Zhang, Guozhu in IEEE Transactions on control systems technology, Vol. 18 N° 3 (Mai 2010) 

Public ISBD [article]  in IEEE Transactions on control systems technology > Vol. 18 N° 3 (Mai 2010) . - pp. 723-731 Titre : Adaptive robust control for servo mechanisms with partially unknown states via dynamic surface control approach Type de document : texte imprimé Auteurs : Zhang, Guozhu, Auteur ; Chen, Jie, Auteur ; Zhiping Lee, Auteur Année de publication : 2011 Article en page(s) : pp. 723-731 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Adaptive  robust  control  (ARC)  Dynamic  surface  control  (DSC)  Servo  mechanism  State  observer  Two-axis  turntable Index. décimale : 629.1 Résumé : In order to achieve high performance control for servo mechanisms with electrical dynamics and unmeasurable states, an observer-based adaptive robust controller (ARC) is developed via dynamic surface control (DSC) technique. To represent electrical dynamics, a third-order model is used to describe the servo mechanism. However, the third-order model brings some difficulties to observer construction and recursive controller design. To solve this problem, we first transform the model into a particular form suitable for observer design, and then construct a parameterized observer to estimate the unmeasurable states. The state estimation is based on the output and its derivatives, which can be acquired by an output differential observer. Subsequently, an observer-based ARC can be developed through DSC technique, with which the problem of "explosion of complexity" caused by backstepping method in the traditional ARC design can be overcome. A stability analysis is given, showing that our control law can guarantee uniformly ultimate boundedness of the solution of the closed-loop system, and make the tracking error arbitrarily small. This scheme is implemented on a precision two-axis turntable. Experimental results are presented to illustrate the effectiveness and the achievable control performance of the proposed scheme. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5208210 [article] Adaptive robust control for servo mechanisms with partially unknown states via dynamic surface control approach [texte imprimé] / Zhang, Guozhu, Auteur ; Chen, Jie, Auteur ; Zhiping Lee, Auteur . - 2011 . - pp. 723-731. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 3 (Mai 2010) . - pp. 723-731 Mots-clés : Adaptive  robust  control  (ARC)  Dynamic  surface  control  (DSC)  Servo  mechanism  State  observer  Two-axis  turntable Index. décimale : 629.1 Résumé : In order to achieve high performance control for servo mechanisms with electrical dynamics and unmeasurable states, an observer-based adaptive robust controller (ARC) is developed via dynamic surface control (DSC) technique. To represent electrical dynamics, a third-order model is used to describe the servo mechanism. However, the third-order model brings some difficulties to observer construction and recursive controller design. To solve this problem, we first transform the model into a particular form suitable for observer design, and then construct a parameterized observer to estimate the unmeasurable states. The state estimation is based on the output and its derivatives, which can be acquired by an output differential observer. Subsequently, an observer-based ARC can be developed through DSC technique, with which the problem of "explosion of complexity" caused by backstepping method in the traditional ARC design can be overcome. A stability analysis is given, showing that our control law can guarantee uniformly ultimate boundedness of the solution of the closed-loop system, and make the tracking error arbitrarily small. This scheme is implemented on a precision two-axis turntable. Experimental results are presented to illustrate the effectiveness and the achievable control performance of the proposed scheme. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5208210

Adsorption and catalytic oxidation of gaseous elemental mercury in flue gas over MnOx/alumina / Shaohua Qiao in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3317–3322 Titre : Adsorption and catalytic oxidation of gaseous elemental mercury in flue gas over MnOx/alumina Type de document : texte imprimé Auteurs : Shaohua Qiao, Auteur ; Chen, Jie, Auteur ; Jianfeng Li, Auteur Année de publication : 2009 Article en page(s) : pp. 3317–3322 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : MnOx/alumina  catalysts  Flue  gas  Hydrogen  chloride  Adsorption Résumé : MnOx/Al2O3 catalysts (i.e., impregnating manganese oxide on alumina) were employed to remove elemental mercury (Hg0) from flue gas. MnOx/Al2O3 was found to have significant adsorption performance on capturing Hg0 in the absence of hydrogen chloride (HCl), and its favorable adsorption temperature was about 600 K. However, the catalytic oxidation of Hg0 became dominant when HCl or chlorine (Cl2) was present in flue gas, and the removal efficiency of Hg0 was up to 90% with 20 ppm of HCl or 2 ppm of Cl2. In addition, the catalysts with adsorbed mercury could be chemically regenerated by rinsing with HCl gas to strip off the adsorbed mercury in the form of HgCl2. Sulfur dioxide displayed inhibition to the adsorption of Hg0on the catalysts, but the inhibition was less to the catalytic oxidation of Hg0, especially in the presence of Cl2. The analysis results of XPS and pyrolysis−AAS indicated that the adsorbed mercury was mainly in the forms of mercuric oxide (HgO) and the weakly bonded speciation, and the ratio of them varied with the adsorption amount and manganese content on catalysts. The multifunctional performances of MnOx/Al2O3 on the removal of Hg0 appeared to be promising in the industrial applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801478w [article] Adsorption and catalytic oxidation of gaseous elemental mercury in flue gas over MnOx/alumina [texte imprimé] / Shaohua Qiao, Auteur ; Chen, Jie, Auteur ; Jianfeng Li, Auteur . - 2009 . - pp. 3317–3322. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3317–3322 Mots-clés : MnOx/alumina  catalysts  Flue  gas  Hydrogen  chloride  Adsorption Résumé : MnOx/Al2O3 catalysts (i.e., impregnating manganese oxide on alumina) were employed to remove elemental mercury (Hg0) from flue gas. MnOx/Al2O3 was found to have significant adsorption performance on capturing Hg0 in the absence of hydrogen chloride (HCl), and its favorable adsorption temperature was about 600 K. However, the catalytic oxidation of Hg0 became dominant when HCl or chlorine (Cl2) was present in flue gas, and the removal efficiency of Hg0 was up to 90% with 20 ppm of HCl or 2 ppm of Cl2. In addition, the catalysts with adsorbed mercury could be chemically regenerated by rinsing with HCl gas to strip off the adsorbed mercury in the form of HgCl2. Sulfur dioxide displayed inhibition to the adsorption of Hg0on the catalysts, but the inhibition was less to the catalytic oxidation of Hg0, especially in the presence of Cl2. The analysis results of XPS and pyrolysis−AAS indicated that the adsorbed mercury was mainly in the forms of mercuric oxide (HgO) and the weakly bonded speciation, and the ratio of them varied with the adsorption amount and manganese content on catalysts. The multifunctional performances of MnOx/Al2O3 on the removal of Hg0 appeared to be promising in the industrial applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801478w

Identifier-based adaptive robust control for servomechanisms with improved transient performance / Zhang, Guozhu in IEEE transactions on industrial electronics, Vol. 57 N° 7 (Juillet 2010) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 57 N° 7 (Juillet 2010) . - pp. 2536 - 2547 Titre : Identifier-based adaptive robust control for servomechanisms with improved transient performance Type de document : texte imprimé Auteurs : Zhang, Guozhu, Auteur ; Chen, Jie, Auteur ; Li, Zhiping, Auteur Article en page(s) : pp. 2536 - 2547 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Adaptive  control  Identification  Robust  control  Servomechanism Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper focuses on the adaptive robust control (ARC) for servomechanisms whose dynamic models are subject to unknown parameters, disturbance, and parameter sudden changes. To improve the control performance of the traditional ARC, a novel identifier-based ARC (IFARC) scheme is proposed. In this scheme, an identifier is utilized to accelerate the parameter tuning process and to heighten the accuracy of parameter estimation. A switching logic component based on a given performance index is introduced to select the better parameter estimate vector from those provided by the identifier and the adaptation law. As a result, transient performance can be improved according to the certainty equivalence principle. In addition, the exact reconstruction of the unknown parameters and exponential decay of the tracking error can be achieved under certain conditions. The stability and performance of IFARC are theoretically analyzed. Finally, simulation results show that the IFARC can achieve favorable tracking performance. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5313865 [article] Identifier-based adaptive robust control for servomechanisms with improved transient performance [texte imprimé] / Zhang, Guozhu, Auteur ; Chen, Jie, Auteur ; Li, Zhiping, Auteur . - pp. 2536 - 2547. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 57 N° 7 (Juillet 2010) . - pp. 2536 - 2547 Mots-clés : Adaptive  control  Identification  Robust  control  Servomechanism Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper focuses on the adaptive robust control (ARC) for servomechanisms whose dynamic models are subject to unknown parameters, disturbance, and parameter sudden changes. To improve the control performance of the traditional ARC, a novel identifier-based ARC (IFARC) scheme is proposed. In this scheme, an identifier is utilized to accelerate the parameter tuning process and to heighten the accuracy of parameter estimation. A switching logic component based on a given performance index is introduced to select the better parameter estimate vector from those provided by the identifier and the adaptation law. As a result, transient performance can be improved according to the certainty equivalence principle. In addition, the exact reconstruction of the unknown parameters and exponential decay of the tracking error can be achieved under certain conditions. The stability and performance of IFARC are theoretically analyzed. Finally, simulation results show that the IFARC can achieve favorable tracking performance. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5313865

Networked Predictive Control of Systems With Random Network Delays in Both Forward and Feedback Channels / Liu, Guo-Ping in IEEE transactions on industrial electronics, Vol. 54 N°3 (Juin 2007) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 54 N°3 (Juin 2007) . - 1282-1297 p. Titre : Networked Predictive Control of Systems With Random Network Delays in Both Forward and Feedback Channels Titre original : La commande prédictive gérée en réseau des systèmes avec le réseau aléatoire retardé dans des canaux en avant et de rétroaction Type de document : texte imprimé Auteurs : Liu, Guo-Ping, Auteur ; Xia, Yuanqing, Auteur ; Chen, Jie, Auteur Article en page(s) : 1282-1297 p. Note générale : Génie Electrique Langues : Anglais (eng) Mots-clés : Networked  control  systems  (NCS)  Predictive  control  Random  network  delay  Stability  Systèmes  de  commande  gérés  en  réseau  Commande  prédictive  Réseau  aléatoire  retardent  Stabilité Index. décimale : 621 Ingénierie mécanique en général. Technologie nucléaire. Ingénierie électrique. Machinerie Résumé : The design problem of networked control systems (NCS) with constant and random network delay in the forward and feedback channels, respectively, is considered in this paper. A novel networked predictive control (NPC) scheme is proposed to overcome the effects of network delay and data dropout. Stability criteria of closed-loop NPC systems are presented. The necessary and sufficient conditions for the stability of closed-loop NCS with constant time delay are given. Furthermore, it is shown that a closed-loop NPC system with bounded random network delay is stable if its corresponding switched system is stable. Both simulation study and practical experiments show the effectiveness of the control scheme. Le problème de conception des systèmes de commande gérés en réseau (NCS) avec le réseau constant et aléatoire retardent dans le vers l'avant et des canaux de rétroaction, respectivement, est considérés en cet article. On propose un arrangement prédictif géré en réseau de la commande de roman (NPC) pour surmonter les effets du réseau retardent et du renvoi de données. Des critères de stabilité des systèmes en circuit fermé de NPC sont présentés. Les conditions nécessaires et suffisantes pour la stabilité de NCS en circuit fermé avec du temps constant retardent sont données. En outre, on lui montre qu'un système en circuit fermé de NPC avec le réseau aléatoire lié retardent est stable si son système commuté correspondant est stable. L'étude de simulation et les expériences pratiques montrent l'efficacité de l'arrangement de commande. DEWEY : 621 ISSN : 0278-0046 RAMEAU : Commande prédictive-- Rétroaction (électronique) En ligne : xia_yuanqing@163.net, chenjie@bit.edu..cn, dress@glam.ac.uk, whu@glam.ac.uk [article] Networked Predictive Control of Systems With Random Network Delays in Both Forward and Feedback Channels = La commande prédictive gérée en réseau des systèmes avec le réseau aléatoire retardé dans des canaux en avant et de rétroaction [texte imprimé] / Liu, Guo-Ping, Auteur ; Xia, Yuanqing, Auteur ; Chen, Jie, Auteur . - 1282-1297 p. Génie Electrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 54 N°3 (Juin 2007) . - 1282-1297 p. Mots-clés : Networked  control  systems  (NCS)  Predictive  control  Random  network  delay  Stability  Systèmes  de  commande  gérés  en  réseau  Commande  prédictive  Réseau  aléatoire  retardent  Stabilité Index. décimale : 621 Ingénierie mécanique en général. Technologie nucléaire. Ingénierie électrique. Machinerie Résumé : The design problem of networked control systems (NCS) with constant and random network delay in the forward and feedback channels, respectively, is considered in this paper. A novel networked predictive control (NPC) scheme is proposed to overcome the effects of network delay and data dropout. Stability criteria of closed-loop NPC systems are presented. The necessary and sufficient conditions for the stability of closed-loop NCS with constant time delay are given. Furthermore, it is shown that a closed-loop NPC system with bounded random network delay is stable if its corresponding switched system is stable. Both simulation study and practical experiments show the effectiveness of the control scheme. Le problème de conception des systèmes de commande gérés en réseau (NCS) avec le réseau constant et aléatoire retardent dans le vers l'avant et des canaux de rétroaction, respectivement, est considérés en cet article. On propose un arrangement prédictif géré en réseau de la commande de roman (NPC) pour surmonter les effets du réseau retardent et du renvoi de données. Des critères de stabilité des systèmes en circuit fermé de NPC sont présentés. Les conditions nécessaires et suffisantes pour la stabilité de NCS en circuit fermé avec du temps constant retardent sont données. En outre, on lui montre qu'un système en circuit fermé de NPC avec le réseau aléatoire lié retardent est stable si son système commuté correspondant est stable. L'étude de simulation et les expériences pratiques montrent l'efficacité de l'arrangement de commande. DEWEY : 621 ISSN : 0278-0046 RAMEAU : Commande prédictive-- Rétroaction (électronique) En ligne : xia_yuanqing@163.net, chenjie@bit.edu..cn, dress@glam.ac.uk, whu@glam.ac.uk