Documents disponibles écrits par cet auteur

Frequency domain approach to computing loop phase margins of multivariable systems / Zhen Ye in Industrial & engineering chemistry research, Vol. 47 N° 13 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4418–4424 Titre : Frequency domain approach to computing loop phase margins of multivariable systems Type de document : texte imprimé Auteurs : Zhen Ye, Auteur ; Qing-Guo Wang, Auteur Année de publication : 2008 Article en page(s) : p. 4418–4424 Note générale : Bibliogr. p. 4424 Langues : Anglais (eng) Mots-clés : Loop  phase  margins;  Computing  loop  phase;  Multivariable  systems Résumé : The loop phase margins of multivariable control systems are defined as the allowable individual loop phase perturbations within which stability of the closed-loop system is guaranteed. This paper presents a frequency domain approach to accurately computing these phase margins for multivariable systems. With the help of unitary mapping between two complex vector space, the MIMO phase margin problem is converted using the Nyquist stability analysis to the problem of some simple constrained optimization, which is then solved numerically with the Lagrange multiplier and Newton−Raphson iteration algorithm. The proposed approach can provide exact margins and thus improves the linear matrix inequalities (LMI) results reported before, which could be conservative. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701693j [article] Frequency domain approach to computing loop phase margins of multivariable systems [texte imprimé] / Zhen Ye, Auteur ; Qing-Guo Wang, Auteur . - 2008 . - p. 4418–4424. Bibliogr. p. 4424 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4418–4424 Mots-clés : Loop  phase  margins;  Computing  loop  phase;  Multivariable  systems Résumé : The loop phase margins of multivariable control systems are defined as the allowable individual loop phase perturbations within which stability of the closed-loop system is guaranteed. This paper presents a frequency domain approach to accurately computing these phase margins for multivariable systems. With the help of unitary mapping between two complex vector space, the MIMO phase margin problem is converted using the Nyquist stability analysis to the problem of some simple constrained optimization, which is then solved numerically with the Lagrange multiplier and Newton−Raphson iteration algorithm. The proposed approach can provide exact margins and thus improves the linear matrix inequalities (LMI) results reported before, which could be conservative. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701693j

Integral identification of continuous-time delay systems in the presence of unknown initial conditions and disturbances from step tests / Qing-Guo Wang 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. 4929–4936 Titre : Integral identification of continuous-time delay systems in the presence of unknown initial conditions and disturbances from step tests Type de document : texte imprimé Auteurs : Qing-Guo Wang, Auteur ; Liu, Min, Auteur ; Chang Chieh Hang, Auteur Année de publication : 2008 Article en page(s) : p. 4929–4936 Langues : Anglais (eng) Mots-clés : Continuous-time  delay  systems  --  integral  identification  method;  Static  disturbance Résumé : In this paper, an integral identification method is proposed for continuous-time delay systems in presence of both unknown initial conditions and static disturbances from a step test. The integration limits are specifically chosen to make the resulting integral equation independent of the unknown initial conditions. This enables identification of the process model from a step test by one-stage least-squares algorithm without any iteration. The proposed identification method is demonstrated through numerical simulation and real time testing. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071532s [article] Integral identification of continuous-time delay systems in the presence of unknown initial conditions and disturbances from step tests [texte imprimé] / Qing-Guo Wang, Auteur ; Liu, Min, Auteur ; Chang Chieh Hang, Auteur . - 2008 . - p. 4929–4936. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4929–4936 Mots-clés : Continuous-time  delay  systems  --  integral  identification  method;  Static  disturbance Résumé : In this paper, an integral identification method is proposed for continuous-time delay systems in presence of both unknown initial conditions and static disturbances from a step test. The integration limits are specifically chosen to make the resulting integral equation independent of the unknown initial conditions. This enables identification of the process model from a step test by one-stage least-squares algorithm without any iteration. The proposed identification method is demonstrated through numerical simulation and real time testing. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071532s

Memoryless adaptive controller design for uncertain polynomial systems with multiple time delays / Chang-Chun Hua in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 130 n°4 (Juillet 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°4 (Juillet 2008) . - 7 p. Titre : Memoryless adaptive controller design for uncertain polynomial systems with multiple time delays Type de document : texte imprimé Auteurs : Chang-Chun Hua, Auteur ; Qing-Guo Wang, Auteur ; Peng, Shi, Auteur Année de publication : 2008 Article en page(s) : 7 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : control  equipment;  design;  delays;  polynomials;  closed  loop  systems Résumé : The stabilization problem is investigated for a class of uncertain systems with multiple time-varying delays. The considered system includes the uncertain nonlinear time delay functions, whose bounds are in the form of polynomial-type functions with unknown coefficients. The system is decomposed into two subsystems based on the input matrix. For the first subsystem, a time delay dependent linear virtual control input is constructed. Then, a memoryless state feedback controller is designed based on backstepping method. By employing new Lyapunov–Krasovskii functional, we show that the closed-loop system is exponentially stable. Finally, simulations are conducted to verify the effectiveness of the proposed method. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Memoryless adaptive controller design for uncertain polynomial systems with multiple time delays [texte imprimé] / Chang-Chun Hua, Auteur ; Qing-Guo Wang, Auteur ; Peng, Shi, Auteur . - 2008 . - 7 p. dynamic systems Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°4 (Juillet 2008) . - 7 p. Mots-clés : control  equipment;  design;  delays;  polynomials;  closed  loop  systems Résumé : The stabilization problem is investigated for a class of uncertain systems with multiple time-varying delays. The considered system includes the uncertain nonlinear time delay functions, whose bounds are in the form of polynomial-type functions with unknown coefficients. The system is decomposed into two subsystems based on the input matrix. For the first subsystem, a time delay dependent linear virtual control input is constructed. Then, a memoryless state feedback controller is designed based on backstepping method. By employing new Lyapunov–Krasovskii functional, we show that the closed-loop system is exponentially stable. Finally, simulations are conducted to verify the effectiveness of the proposed method. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]