Delay-dependent stabilization of discrete-time systems with time-varying delay via switching technique / Zhang Hui in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 134 N° 4 (Juillet 2012)  

Public ISBD [article]  inTransactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 4 (Juillet 2012) . - 05 p. Titre : Delay-dependent stabilization of discrete-time systems with time-varying delay via switching technique Type de document : texte imprimé Auteurs : Zhang Hui, Auteur ; Yang Shi, Auteur Année de publication : 2012 Article en page(s) : 05 p. Note générale : Dynamic systems Langues : Anglais (eng) Mots-clés : Discrete-time systems Randomly time-varying delays Occurence probability Switching controllers Exponential meansquare stability Linear matrix inequality Index. décimale : 629.8 Résumé : In this paper, we investigate the stabilization problem of time-delay discrete-time systems with occurrence probabilities for time delays. Using an augmenting technique, we convert random time-delay discrete-time systems to delay-free systems with stochastic variables. We propose to design a sequence of delay-dependent controllers. The implemented controller is chosen according to the measured time delay at each sampling instant. When the delay is randomly time-varying, the implemented controller is switched in a designed controller set. An example is provided to illustrate the effectiveness of the stability condition and another example is offered to show the applicability of the proposed design algorithm. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000004 [...] [article] Delay-dependent stabilization of discrete-time systems with time-varying delay via switching technique [texte imprimé] / Zhang Hui, Auteur ; Yang Shi, Auteur . - 2012 . - 05 p. Dynamic systems Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 134 N° 4 (Juillet 2012) . - 05 p. Mots-clés : Discrete-time systems Randomly time-varying delays Occurence probability Switching controllers Exponential meansquare stability Linear matrix inequality Index. décimale : 629.8 Résumé : In this paper, we investigate the stabilization problem of time-delay discrete-time systems with occurrence probabilities for time delays. Using an augmenting technique, we convert random time-delay discrete-time systems to delay-free systems with stochastic variables. We propose to design a sequence of delay-dependent controllers. The implemented controller is chosen according to the measured time delay at each sampling instant. When the delay is randomly time-varying, the implemented controller is switched in a designed controller set. An example is provided to illustrate the effectiveness of the stability condition and another example is offered to show the applicability of the proposed design algorithm. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000134000004 [...]

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Modified generalized predictive control of networked systems with application to a hydraulic position control system / Yu, Bo in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 133 N° 3 (Mai 2011)  

Public ISBD [article]  inTransactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 133 N° 3 (Mai 2011) . - 09 p. Titre : Modified generalized predictive control of networked systems with application to a hydraulic position control system Type de document : texte imprimé Auteurs : Yu, Bo, Auteur ; Yang Shi, Auteur ; Huang, Ji, Auteur Année de publication : 2011 Article en page(s) : 09 p. Note générale : Systèmes dynamiques Langues : Anglais (eng) Mots-clés : Netorked control systems (NCSs) Generalized predictive (GPC) Time delays Packet droputs Markov chains Stochastic stability Index. décimale : 629.8 Résumé : This paper is concerned with the design of networked control systems using the modified generalized predictive control (M-GPC) method. Both sensor-to-controller (S-C) and controller-to-actuator (C-A) network-induced delays are modeled by two Markov chains. M-GPC uses the available output and prediction control information at the controller node to obtain the future control sequences. Different from the conventional generalized predictive control in which only the first element in control sequences is used, M-GPC employs the whole control sequences to compensate for the time delays in S-C and C-A links. The closed-loop system is further formulated as a special jump linear system. The sufficient and necessary condition to guarantee the stochastic stability is derived. Simulation studies and experimental tests for an experimental hydraulic position control system are presented to verify the effectiveness of the proposed method. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013300 [...] [article] Modified generalized predictive control of networked systems with application to a hydraulic position control system [texte imprimé] / Yu, Bo, Auteur ; Yang Shi, Auteur ; Huang, Ji, Auteur . - 2011 . - 09 p. Systèmes dynamiques Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 133 N° 3 (Mai 2011) . - 09 p. Mots-clés : Netorked control systems (NCSs) Generalized predictive (GPC) Time delays Packet droputs Markov chains Stochastic stability Index. décimale : 629.8 Résumé : This paper is concerned with the design of networked control systems using the modified generalized predictive control (M-GPC) method. Both sensor-to-controller (S-C) and controller-to-actuator (C-A) network-induced delays are modeled by two Markov chains. M-GPC uses the available output and prediction control information at the controller node to obtain the future control sequences. Different from the conventional generalized predictive control in which only the first element in control sequences is used, M-GPC employs the whole control sequences to compensate for the time delays in S-C and C-A links. The closed-loop system is further formulated as a special jump linear system. The sufficient and necessary condition to guarantee the stochastic stability is derived. Simulation studies and experimental tests for an experimental hydraulic position control system are presented to verify the effectiveness of the proposed method. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013300 [...]

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Quantitative research on the vaporization and decomposition of [EMIM] [Tf2N] by thermogravimetric analysis – mass spectrometry / Yu Chen in Industrial & engineering chemistry research, Vol. 51 N° 21 (Mai 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7418–7427 Titre : Quantitative research on the vaporization and decomposition of [EMIM] [Tf2N] by thermogravimetric analysis – mass spectrometry Type de document : texte imprimé Auteurs : Yu Chen, Auteur ; Yuanyuan Cao, Auteur ; Yang Shi, Auteur Année de publication : 2012 Article en page(s) : pp. 7418–7427 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermogravimetric analysis Mass spectrometry Résumé : The thermal stability of [EMIM][Tf2N] was investigated by thermogravimetric analysis–mass spectrometry (TG–MS) in this study. It showed that [EMIM][Tf2N] decomposed at temperatures over 350 °C by Hoffman elimination and substitution of nucleophilic mechanisms (SN, including the unimolecular substitution nucleophilic reaction SN1 and the bimolecular substitution nucleophilic reaction SN2). The instability of [EMIM][Tf2N] is induced by decomposition of the anion [Tf2N] to a more nucleophilic group, such as NH2 and F, and then methyl and/or ethyl in the imidazolium cation are attacked by those groups of relatively high nucleophilic activity. Mass loss of [EMIM][Tf2N] in a nitrogen atmosphere can be attributed to its decomposition and/or vaporization. The ratios of decomposition and vaporization (Dec/Vap), elimination and SN (Elim/SN), and SN2/SN1 for [EMIM][Tf2N] were approximately determined by TG–MS. The thermal stability including both decomposition and vaporization of [EMIM][Tf2N] decreases with an increase of the temperature, while decomposition is more sensitive to the temperature than evaporation. Vaporization of [EMIM][Tf2N] dominates the mass loss at temperatures below 350 °C, while decomposition dominates the mass loss at temperatures over 350 °C. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300247v [article] Quantitative research on the vaporization and decomposition of [EMIM] [Tf2N] by thermogravimetric analysis – mass spectrometry [texte imprimé] / Yu Chen, Auteur ; Yuanyuan Cao, Auteur ; Yang Shi, Auteur . - 2012 . - pp. 7418–7427. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7418–7427 Mots-clés : Thermogravimetric analysis Mass spectrometry Résumé : The thermal stability of [EMIM][Tf2N] was investigated by thermogravimetric analysis–mass spectrometry (TG–MS) in this study. It showed that [EMIM][Tf2N] decomposed at temperatures over 350 °C by Hoffman elimination and substitution of nucleophilic mechanisms (SN, including the unimolecular substitution nucleophilic reaction SN1 and the bimolecular substitution nucleophilic reaction SN2). The instability of [EMIM][Tf2N] is induced by decomposition of the anion [Tf2N] to a more nucleophilic group, such as NH2 and F, and then methyl and/or ethyl in the imidazolium cation are attacked by those groups of relatively high nucleophilic activity. Mass loss of [EMIM][Tf2N] in a nitrogen atmosphere can be attributed to its decomposition and/or vaporization. The ratios of decomposition and vaporization (Dec/Vap), elimination and SN (Elim/SN), and SN2/SN1 for [EMIM][Tf2N] were approximately determined by TG–MS. The thermal stability including both decomposition and vaporization of [EMIM][Tf2N] decreases with an increase of the temperature, while decomposition is more sensitive to the temperature than evaporation. Vaporization of [EMIM][Tf2N] dominates the mass loss at temperatures below 350 °C, while decomposition dominates the mass loss at temperatures over 350 °C. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300247v

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