Documents disponibles écrits par cet auteur

Autonomous decentralized system identification by markov parameter estimation using distributed smart wireless sensor networks / Junhee Kim in Journal of engineering mechanics, Vol. 138 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 5 (Mai 2012) . - pp.478-490 Titre : Autonomous decentralized system identification by markov parameter estimation using distributed smart wireless sensor networks Type de document : texte imprimé Auteurs : Junhee Kim, Auteur ; Jerome P. Lynch, Auteur Année de publication : 2012 Article en page(s) : pp.478-490 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Markov  parameters  Subspace  identification  Wireless  sensor  network  Smart  structures  Structural  dynamics Résumé : Decentralized data processing has the benefit of improving wireless monitoring system scalability, reducing the amount of wireless communications, and reducing overall power consumption. In this study, a system identification strategy for single-input multi-output (SIMO) subspace system identification is proposed based on Markov parameters. The method is specifically customized for embedment within the decentralized computational framework of a wireless sensor network. By using the computational resources of wireless sensors, individual sensor nodes perform local data processing to identify the Markov parameters of a structural system. The data storage and wireless communication requirements of Markov parameters are significantly less than that required by the original raw data, resulting in the preservation of scarce system resources such as communication bandwidth and battery power. Then, the estimated Markov parameters are wirelessly communicated to a wireless sensor network base station where the global structural properties are assembled by execution of the eigensystem realization algorithm, an indirect subspace system identification method. The proposed strategy is evaluated using input-output and output-only data recorded during dynamic testing of a cantilevered balcony in a historic building (Hill Auditorium, Ann Arbor, MI). ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000359 [article] Autonomous decentralized system identification by markov parameter estimation using distributed smart wireless sensor networks [texte imprimé] / Junhee Kim, Auteur ; Jerome P. Lynch, Auteur . - 2012 . - pp.478-490. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 5 (Mai 2012) . - pp.478-490 Mots-clés : Markov  parameters  Subspace  identification  Wireless  sensor  network  Smart  structures  Structural  dynamics Résumé : Decentralized data processing has the benefit of improving wireless monitoring system scalability, reducing the amount of wireless communications, and reducing overall power consumption. In this study, a system identification strategy for single-input multi-output (SIMO) subspace system identification is proposed based on Markov parameters. The method is specifically customized for embedment within the decentralized computational framework of a wireless sensor network. By using the computational resources of wireless sensors, individual sensor nodes perform local data processing to identify the Markov parameters of a structural system. The data storage and wireless communication requirements of Markov parameters are significantly less than that required by the original raw data, resulting in the preservation of scarce system resources such as communication bandwidth and battery power. Then, the estimated Markov parameters are wirelessly communicated to a wireless sensor network base station where the global structural properties are assembled by execution of the eigensystem realization algorithm, an indirect subspace system identification method. The proposed strategy is evaluated using input-output and output-only data recorded during dynamic testing of a cantilevered balcony in a historic building (Hill Auditorium, Ann Arbor, MI). ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000359

Decentralized Hscrinfin controller design for large-scale civil structures / Yang Wang in Earthquake engineering structural dynamics, Vol. 38 N°3 (Mars 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N°3 (Mars 2009) . - pp. 377-401 Titre : Decentralized Hscrinfin controller design for large-scale civil structures Type de document : texte imprimé Auteurs : Yang Wang, Auteur ; Jerome P. Lynch, Auteur ; Kincho H. Law, Auteur Article en page(s) : pp. 377-401 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : H-infinity  control;  Feedback  structural  control;  Decentralized  control;  Smart  structures Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Complexities inherent to large-scale modern civil structures pose many challenges in the design of feedback structural control systems for dynamic response mitigation. With the emergence of low-cost sensors and control devices creating technologies from which large-scale structural control systems can deploy, a future control system may contain hundreds, or even thousands, of such devices. Key issues in such large-scale structural control systems include reduced system reliability, increasing communication requirements, and longer latencies in the feedback loop. To effectively address these issues, decentralized control strategies provide promising solutions that allow control systems to operate at high nodal counts. This paper examines the feasibility of designing a decentralized controller that minimizes the norm of the closed-loop system. control is a natural choice for decentralization because imposition of decentralized architectures is easy to achieve when posing the controller design using linear matrix inequalities. Decentralized control solutions are investigated for both continuous-time and discrete-time formulations. Numerical simulation results using a 3-story and a 20-story structure illustrate the feasibility of the different decentralized control strategies. The results also demonstrate that when realistic semi-active control devices are used in combination with the decentralized control solution, better performance can be gained over the passive control cases. It is shown that decentralized control strategies may provide equivalent or better control performance, given that their centralized counterparts could suffer from longer sampling periods due to communication and computation constraints. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121520796/abstract [article] Decentralized Hscrinfin controller design for large-scale civil structures [texte imprimé] / Yang Wang, Auteur ; Jerome P. Lynch, Auteur ; Kincho H. Law, Auteur . - pp. 377-401. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N°3 (Mars 2009) . - pp. 377-401 Mots-clés : H-infinity  control;  Feedback  structural  control;  Decentralized  control;  Smart  structures Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Complexities inherent to large-scale modern civil structures pose many challenges in the design of feedback structural control systems for dynamic response mitigation. With the emergence of low-cost sensors and control devices creating technologies from which large-scale structural control systems can deploy, a future control system may contain hundreds, or even thousands, of such devices. Key issues in such large-scale structural control systems include reduced system reliability, increasing communication requirements, and longer latencies in the feedback loop. To effectively address these issues, decentralized control strategies provide promising solutions that allow control systems to operate at high nodal counts. This paper examines the feasibility of designing a decentralized controller that minimizes the norm of the closed-loop system. control is a natural choice for decentralization because imposition of decentralized architectures is easy to achieve when posing the controller design using linear matrix inequalities. Decentralized control solutions are investigated for both continuous-time and discrete-time formulations. Numerical simulation results using a 3-story and a 20-story structure illustrate the feasibility of the different decentralized control strategies. The results also demonstrate that when realistic semi-active control devices are used in combination with the decentralized control solution, better performance can be gained over the passive control cases. It is shown that decentralized control strategies may provide equivalent or better control performance, given that their centralized counterparts could suffer from longer sampling periods due to communication and computation constraints. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121520796/abstract

Experimental verification of a wireless sensing and control system for structural control using MR dampers / Chin-Hsiung Loh in Earthquake engineering structural dynamics, Vol. 36 N°10 (Août 2007) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 36 N°10 (Août 2007) . - 1303-1328 p. Titre : Experimental verification of a wireless sensing and control system for structural control using MR dampers Type de document : texte imprimé Auteurs : Chin-Hsiung Loh, Auteur ; Jerome P. Lynch, Auteur ; Kung-Chun Lu, Auteur Article en page(s) : 1303-1328 p. Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : wireless  active  sensor  LQG  control  algorithm  MR-damper  •decentralized  controlsans  fil  active  LQG  algorithme  de  contrôle  MR-amortisseur  contrôle  décentralisé Index. décimale : 624.151 Résumé : The performance aspects of a wireless active sensor, including the reliability of the wireless communication channel for real-time data delivery and its application to feedback structural control, are explored in this study. First, the control of magnetorheological (MR) dampers using wireless sensors is examined. Second, the application of the MR-damper to actively control a half-scale three-storey steel building excited at its base by shaking table is studied using a wireless control system assembled from wireless active sensors. With an MR damper installed on each floor (three dampers total), structural responses during seismic excitation are measured by the system's wireless active sensors and wirelessly communicated to each other; upon receipt of response data, the wireless sensor interfaced to each MR damper calculates a desired control action using an LQG controller implemented in the wireless sensor's computational core. In this system, the wireless active sensor is responsible for the reception of response data, determination of optimal control forces, and the issuing of command signals to the MR damper. Various control solutions are formulated in this study and embedded in the wireless control system including centralized and decentralized control algorithms. La performance aspects d'un capteur actif sans fil, y compris la fiabilité du canal de communication sans fil pour des données en temps réel et son application aux réactions de contrôle structurel, sont examinées dans cette étude. Tout d'abord, le contrôle de magnetorheological (MR) amortisseurs utilisant des capteurs sans fil est examinée. Ensuite, l'application du MR-amortisseur activement à un contrôle à mi-échelle de trois étages de bâtiment en acier excité à sa base en agitant tableau est étudiée en utilisant un système de contrôle sans fil assemblés sans fil de capteurs actifs. Avec un amortisseur de M. installés sur chaque étage (trois amortisseurs total), des réponses au cours de l'excitation sismique sont mesurées par le système sans fil de capteurs actifs et communiquées sans fil les uns aux autres, à la réception de données de réponse, l'interface sans fil de capteurs à chaque MR calcule un amortisseur désiré de contrôle en utilisant un contrôleur LQG dans la mise en œuvre de capteurs sans fil de base de calcul. Dans ce système, le capteur sans fil active est responsable pour la réception des données de réponse, la détermination de contrôle optimal des forces, et l'émission de signaux de commande à l'amortisseur MR. Diverses solutions de contrôle sont formulées dans cette étude et intégrées dans le système de contrôle sans fil y compris centralisée et décentralisée des algorithmes de contrôle. DEWEY : 551.2 ISSN : 0098-8847 RAMEAU : Amortisseurs En ligne : http://www3.interscience.wiley.com/cgi-bin/abstract/114171096/ABSTRACT [article] Experimental verification of a wireless sensing and control system for structural control using MR dampers [texte imprimé] / Chin-Hsiung Loh, Auteur ; Jerome P. Lynch, Auteur ; Kung-Chun Lu, Auteur . - 1303-1328 p. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 36 N°10 (Août 2007) . - 1303-1328 p. Mots-clés : wireless  active  sensor  LQG  control  algorithm  MR-damper  •decentralized  controlsans  fil  active  LQG  algorithme  de  contrôle  MR-amortisseur  contrôle  décentralisé Index. décimale : 624.151 Résumé : The performance aspects of a wireless active sensor, including the reliability of the wireless communication channel for real-time data delivery and its application to feedback structural control, are explored in this study. First, the control of magnetorheological (MR) dampers using wireless sensors is examined. Second, the application of the MR-damper to actively control a half-scale three-storey steel building excited at its base by shaking table is studied using a wireless control system assembled from wireless active sensors. With an MR damper installed on each floor (three dampers total), structural responses during seismic excitation are measured by the system's wireless active sensors and wirelessly communicated to each other; upon receipt of response data, the wireless sensor interfaced to each MR damper calculates a desired control action using an LQG controller implemented in the wireless sensor's computational core. In this system, the wireless active sensor is responsible for the reception of response data, determination of optimal control forces, and the issuing of command signals to the MR damper. Various control solutions are formulated in this study and embedded in the wireless control system including centralized and decentralized control algorithms. La performance aspects d'un capteur actif sans fil, y compris la fiabilité du canal de communication sans fil pour des données en temps réel et son application aux réactions de contrôle structurel, sont examinées dans cette étude. Tout d'abord, le contrôle de magnetorheological (MR) amortisseurs utilisant des capteurs sans fil est examinée. Ensuite, l'application du MR-amortisseur activement à un contrôle à mi-échelle de trois étages de bâtiment en acier excité à sa base en agitant tableau est étudiée en utilisant un système de contrôle sans fil assemblés sans fil de capteurs actifs. Avec un amortisseur de M. installés sur chaque étage (trois amortisseurs total), des réponses au cours de l'excitation sismique sont mesurées par le système sans fil de capteurs actifs et communiquées sans fil les uns aux autres, à la réception de données de réponse, l'interface sans fil de capteurs à chaque MR calcule un amortisseur désiré de contrôle en utilisant un contrôleur LQG dans la mise en œuvre de capteurs sans fil de base de calcul. Dans ce système, le capteur sans fil active est responsable pour la réception des données de réponse, la détermination de contrôle optimal des forces, et l'émission de signaux de commande à l'amortisseur MR. Diverses solutions de contrôle sont formulées dans cette étude et intégrées dans le système de contrôle sans fil y compris centralisée et décentralisée des algorithmes de contrôle. DEWEY : 551.2 ISSN : 0098-8847 RAMEAU : Amortisseurs En ligne : http://www3.interscience.wiley.com/cgi-bin/abstract/114171096/ABSTRACT