Documents disponibles écrits par cet auteur

Development of a Unified Design, Test, and Research Platform for Wind Energy Systems Based on Hardware-in-the-Loop Real-Time Simulation / Li, Hui in IEEE transactions on industrial electronics, Vol. 53 N° 4 (Aout 2006) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 53 N° 4 (Aout 2006) . - 1144- 1151 p. Titre : Development of a Unified Design, Test, and Research Platform for Wind Energy Systems Based on Hardware-in-the-Loop Real-Time Simulation Titre original : Développement d'une Conception, d'un Essai, et d'une Plateforme Unifiés de Recherches pour des Systèmes d'Energie Eolienne Basés sur le Matériel dans la Simulation de Temps Réel de Boucle Type de document : texte imprimé Auteurs : Li, Hui, Auteur ; Shi, K. L. ; Steurer, Mischa, Auteur Article en page(s) : 1144- 1151 p. Note générale : Génie Electrique Langues : Anglais (eng) Mots-clés : Hardware-in-the-loop  simulation  Maximum  power  tracking  Neural  network  Real-time  simulation  Wind  energy.Matériel  dans  la  simulation  de  boucle  Puissance  maximum  dépistant  le  réseau  neurologique  Simulation  en  temps  réel  Énergie  éolienne Index. décimale : 621 Ingénierie mécanique en général. Technologie nucléaire. Ingénierie électrique. Machinerie Résumé : Traditionally, offline modeling and simulation has been the tool of choice for improving wind energy system control strategies and their utility system integration. This paper exploits how a newly established real-time hardware-in-the-loop (HIL) test facility, which is designed for testing all-electric ship propulsion systems, can be utilized for wind energy research. The test site uses two 2.5-MW/220-rpm dynamometers and a 5-MW variable voltage and frequency converter to emulate a realistic dynamic environment, both mechanically and electrically. The facility is controlled by a digital real-time electric power system simulator that is capable of simulating electrical networks and control systems of substantial complexity, typically with a 50-$muhboxs$time step. Substantial input/output allows the feedback of measured quantities into the simulation. A 15-kW mock-up motor–generator set is used to demonstrate some critical aspects of the concept including the implementation of a proposed neural-network-based sensorless maximum wind energy capture control. From the dynamic test results presented, it is concluded that the proposed system shows great potential for the development of a unified wind energy design, test, and research platform. Traditionnellement, en différé modeler et simulation a été l'outil du choix pour améliorer des stratégies de commande de système d'énergie éolienne et leur intégration de système de service. Exploits de cet article comment un service en temps réel nouvellement établi d'essai de la matériel-dans-le-boucle (HIL), qui est conçu pour examiner les systèmes tout-électriques de propulsion de bateau, peut être utilisé pour recherche en matière d'énergie éolienne. L'emplacement d'essai utilise deux dynamomètres 2.5-MW/220-rpm et un convertisseur variable de la tension 5-MW et de fréquence pour émuler un environnement dynamique réaliste, mécaniquement et électriquement. Le service est commandé par un simulateur en temps réel numérique de système d'énergie électrique qui est capable de simuler les réseaux et les systèmes de commande électriques de la complexité substantielle, typiquement avec une étape 50-$muhboxs$time. L'entrée-sortie substantielle permet la rétroaction des quantités mesurées dans la simulation. Un ensemble de moteur-générateur de la maquette 15-kW est employé pour démontrer quelques aspects critiques du concept comprenant l'exécution d'une commande maximum sensorless neural-réseau-basée proposée de capture d'énergie éolienne. Des résultats d'essai dynamiques a présenté, on le conclut que le système proposé montre le grand potentiel pour le développement d'une conception d'énergie éolienne, d'un essai, et d'une plateforme unifiés de recherches. DEWEY : 621 ISSN : 0278-0046 En ligne : hli@caps.fsu.edu, steurer@caps.fsu.edu, woodruff@caps.fsu.edu, zhang@caps.fsu.ed [...] [article] Development of a Unified Design, Test, and Research Platform for Wind Energy Systems Based on Hardware-in-the-Loop Real-Time Simulation = Développement d'une Conception, d'un Essai, et d'une Plateforme Unifiés de Recherches pour des Systèmes d'Energie Eolienne Basés sur le Matériel dans la Simulation de Temps Réel de Boucle [texte imprimé] / Li, Hui, Auteur ; Shi, K. L. ; Steurer, Mischa, Auteur . - 1144- 1151 p. Génie Electrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 53 N° 4 (Aout 2006) . - 1144- 1151 p. Mots-clés : Hardware-in-the-loop  simulation  Maximum  power  tracking  Neural  network  Real-time  simulation  Wind  energy.Matériel  dans  la  simulation  de  boucle  Puissance  maximum  dépistant  le  réseau  neurologique  Simulation  en  temps  réel  Énergie  éolienne Index. décimale : 621 Ingénierie mécanique en général. Technologie nucléaire. Ingénierie électrique. Machinerie Résumé : Traditionally, offline modeling and simulation has been the tool of choice for improving wind energy system control strategies and their utility system integration. This paper exploits how a newly established real-time hardware-in-the-loop (HIL) test facility, which is designed for testing all-electric ship propulsion systems, can be utilized for wind energy research. The test site uses two 2.5-MW/220-rpm dynamometers and a 5-MW variable voltage and frequency converter to emulate a realistic dynamic environment, both mechanically and electrically. The facility is controlled by a digital real-time electric power system simulator that is capable of simulating electrical networks and control systems of substantial complexity, typically with a 50-$muhboxs$time step. Substantial input/output allows the feedback of measured quantities into the simulation. A 15-kW mock-up motor–generator set is used to demonstrate some critical aspects of the concept including the implementation of a proposed neural-network-based sensorless maximum wind energy capture control. From the dynamic test results presented, it is concluded that the proposed system shows great potential for the development of a unified wind energy design, test, and research platform. Traditionnellement, en différé modeler et simulation a été l'outil du choix pour améliorer des stratégies de commande de système d'énergie éolienne et leur intégration de système de service. Exploits de cet article comment un service en temps réel nouvellement établi d'essai de la matériel-dans-le-boucle (HIL), qui est conçu pour examiner les systèmes tout-électriques de propulsion de bateau, peut être utilisé pour recherche en matière d'énergie éolienne. L'emplacement d'essai utilise deux dynamomètres 2.5-MW/220-rpm et un convertisseur variable de la tension 5-MW et de fréquence pour émuler un environnement dynamique réaliste, mécaniquement et électriquement. Le service est commandé par un simulateur en temps réel numérique de système d'énergie électrique qui est capable de simuler les réseaux et les systèmes de commande électriques de la complexité substantielle, typiquement avec une étape 50-$muhboxs$time. L'entrée-sortie substantielle permet la rétroaction des quantités mesurées dans la simulation. Un ensemble de moteur-générateur de la maquette 15-kW est employé pour démontrer quelques aspects critiques du concept comprenant l'exécution d'une commande maximum sensorless neural-réseau-basée proposée de capture d'énergie éolienne. Des résultats d'essai dynamiques a présenté, on le conclut que le système proposé montre le grand potentiel pour le développement d'une conception d'énergie éolienne, d'un essai, et d'une plateforme unifiés de recherches. DEWEY : 621 ISSN : 0278-0046 En ligne : hli@caps.fsu.edu, steurer@caps.fsu.edu, woodruff@caps.fsu.edu, zhang@caps.fsu.ed [...]

Experimental and analytical study on pounding reduction of base-isolated highway bridges using MR dampers / Guo Anxin in Earthquake engineering structural dynamics, Vol. 38 N° 11 (Septembre 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1307-1333 Titre : Experimental and analytical study on pounding reduction of base-isolated highway bridges using MR dampers Type de document : texte imprimé Auteurs : Guo Anxin, Auteur ; Li Zhongjun, Auteur ; Li, Hui, Auteur Article en page(s) : pp. 1307-1333 Langues : Anglais (eng) Mots-clés : Pounding;  Highway  bridge;  Shaking  table  test;  Semiactive  control;  MR  damper;  Seismic  response Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Pounding between adjacent superstructures has been a major cause of highway bridge damage in the past several earthquakes. This paper presents an experimental and analytical study on pounding reduction of highway bridges subjected to earthquake ground motions by using magnetorheological (MR) dampers. An analytical model, which incorporates structural pounding and MR dampers, is developed. A series of shaking table tests on a 1:20 scaled base-isolated bridge model are performed to investigate the effects of pounding between adjacent superstructures on the dynamics of the structures. Based on the test results, the parameters of the linear and the nonlinear viscoelastic impact models are identified. Performance of the semiactive system for reducing structural pounding is also investigated experimentally, in which the MR dampers are used in conjunction with the proposed control strategy, to verify the effectiveness of the MR dampers. Structural responses are also simulated by using the established analytical model and compared with the shaking table test results. The results show that pounding between adjacent superstructures of the highway bridge significantly increases the structural acceleration responses. For the base-isolated bridge model considered here, the semiactive control system with MR dampers effectively precludes pounding. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Experimental and analytical study on pounding reduction of base-isolated highway bridges using MR dampers [texte imprimé] / Guo Anxin, Auteur ; Li Zhongjun, Auteur ; Li, Hui, Auteur . - pp. 1307-1333. Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1307-1333 Mots-clés : Pounding;  Highway  bridge;  Shaking  table  test;  Semiactive  control;  MR  damper;  Seismic  response Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Pounding between adjacent superstructures has been a major cause of highway bridge damage in the past several earthquakes. This paper presents an experimental and analytical study on pounding reduction of highway bridges subjected to earthquake ground motions by using magnetorheological (MR) dampers. An analytical model, which incorporates structural pounding and MR dampers, is developed. A series of shaking table tests on a 1:20 scaled base-isolated bridge model are performed to investigate the effects of pounding between adjacent superstructures on the dynamics of the structures. Based on the test results, the parameters of the linear and the nonlinear viscoelastic impact models are identified. Performance of the semiactive system for reducing structural pounding is also investigated experimentally, in which the MR dampers are used in conjunction with the proposed control strategy, to verify the effectiveness of the MR dampers. Structural responses are also simulated by using the established analytical model and compared with the shaking table test results. The results show that pounding between adjacent superstructures of the highway bridge significantly increases the structural acceleration responses. For the base-isolated bridge model considered here, the semiactive control system with MR dampers effectively precludes pounding. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe

Highly photoluminescent and stable aqueous ZnS quantum dots / Li, Hui in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 578–582 Titre : Highly photoluminescent and stable aqueous ZnS quantum dots Type de document : texte imprimé Auteurs : Li, Hui, Auteur ; Shih, Wan Y., Auteur ; Shih, Wei-Heng, Auteur Année de publication : 2010 Article en page(s) : pp 578–582 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Aqueous  photoluminescent  ZnS  quantum  Mercaptopropionic  acid. Résumé : We report an all-aqueous synthesis of highly photoluminescent and stable ZnS quantum dots (QDs) with water as the medium. The method involves first synthesizing ZnS QDs with 3-mercaptopropionic acid (MPA) as the capping molecule and then replacing some of the MPA with (3-mercaptopropyl)trimethoxysilane (MPS). The resultant MPS-replaced ZnS QDs were about 5 nm in size with a cubic zinc blende crystalline structure, and they had both MPA and MPS on the surface as confirmed by Fourier transform infrared (FTIR) spectroscopy. They exhibited blue trap-state emissions around 415 nm and a quantum yield (QY) of 75% with rhodamine 101 as the reference, and they remained stable for more than 60 days under ambient conditions. Through the capping-molecule replacement procedure, the MPS-replaced ZnS QDs avoided the shortcomings of both MPA/ZnS QDs and MPS/ZnS QDs and acquired the advantages of strong photoluminescence and good stability, which are important to QD applications, especially for bioimaging. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901086d [article] Highly photoluminescent and stable aqueous ZnS quantum dots [texte imprimé] / Li, Hui, Auteur ; Shih, Wan Y., Auteur ; Shih, Wei-Heng, Auteur . - 2010 . - pp 578–582. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 578–582 Mots-clés : Aqueous  photoluminescent  ZnS  quantum  Mercaptopropionic  acid. Résumé : We report an all-aqueous synthesis of highly photoluminescent and stable ZnS quantum dots (QDs) with water as the medium. The method involves first synthesizing ZnS QDs with 3-mercaptopropionic acid (MPA) as the capping molecule and then replacing some of the MPA with (3-mercaptopropyl)trimethoxysilane (MPS). The resultant MPS-replaced ZnS QDs were about 5 nm in size with a cubic zinc blende crystalline structure, and they had both MPA and MPS on the surface as confirmed by Fourier transform infrared (FTIR) spectroscopy. They exhibited blue trap-state emissions around 415 nm and a quantum yield (QY) of 75% with rhodamine 101 as the reference, and they remained stable for more than 60 days under ambient conditions. Through the capping-molecule replacement procedure, the MPS-replaced ZnS QDs avoided the shortcomings of both MPA/ZnS QDs and MPS/ZnS QDs and acquired the advantages of strong photoluminescence and good stability, which are important to QD applications, especially for bioimaging. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901086d

Optimization of multibrid permanent-magnet wind generator systems / Li, Hui in IEEE transactions on energy conversion, Vol. 24 N°1 (Mars 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N°1 (Mars 2009) . - pp. 82 - 92 Titre : Optimization of multibrid permanent-magnet wind generator systems Type de document : texte imprimé Auteurs : Li, Hui, Auteur ; Zhe, Chen, Auteur ; Polinder, H., Auteur Année de publication : 2009 Article en page(s) : pp. 82 - 92 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Gears;  genetic  algorithms;  permanent  magnet  generators;  power  convertors;  wind  turbines Résumé : This paper investigates the cost-effective ranges of gearbox ratios and power ratings of multibrid permanent-magnet (PM) wind generator systems by using a design optimization method. First, the analytical model of a multibrid wind turbine concept consisting of a single-stage gearbox and a three-phase radial-flux PM synchronous generator with a back-to-back power converter is presented. The design optimization is adopted with a genetic algorithm for minimizing generator system cost. To demonstrate the effectiveness of the developed electromagnetic design model, the optimization results of a 500-kW direct-drive PM generator and a 1.5-MW multibrid PM generator with various gear ratios are, respectively, compared with those from other methods. Then, the optimal design approach is further employed for a range from 750 kW up to 10 MW. The optimization results of PM generator systems including direct-drive and multibrid wind turbine configurations are obtained, and the suitable ranges of gear ratios for different power ratings are investigated. Finally, the detailed comparisons of the most cost-effective multibrid PM generator system and the optimized direct-drive PM generator system are also presented and discussed. The comparative results have shown that the multibrid wind turbine concept appears more cost-effective than the direct-drive concept. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4783055&sortType%3Das [...] [article] Optimization of multibrid permanent-magnet wind generator systems [texte imprimé] / Li, Hui, Auteur ; Zhe, Chen, Auteur ; Polinder, H., Auteur . - 2009 . - pp. 82 - 92. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N°1 (Mars 2009) . - pp. 82 - 92 Mots-clés : Gears;  genetic  algorithms;  permanent  magnet  generators;  power  convertors;  wind  turbines Résumé : This paper investigates the cost-effective ranges of gearbox ratios and power ratings of multibrid permanent-magnet (PM) wind generator systems by using a design optimization method. First, the analytical model of a multibrid wind turbine concept consisting of a single-stage gearbox and a three-phase radial-flux PM synchronous generator with a back-to-back power converter is presented. The design optimization is adopted with a genetic algorithm for minimizing generator system cost. To demonstrate the effectiveness of the developed electromagnetic design model, the optimization results of a 500-kW direct-drive PM generator and a 1.5-MW multibrid PM generator with various gear ratios are, respectively, compared with those from other methods. Then, the optimal design approach is further employed for a range from 750 kW up to 10 MW. The optimization results of PM generator systems including direct-drive and multibrid wind turbine configurations are obtained, and the suitable ranges of gear ratios for different power ratings are investigated. Finally, the detailed comparisons of the most cost-effective multibrid PM generator system and the optimized direct-drive PM generator system are also presented and discussed. The comparative results have shown that the multibrid wind turbine concept appears more cost-effective than the direct-drive concept. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4783055&sortType%3Das [...]

Reduction-based model updating of a scaled offshore platform structure / Li, Hui in Journal of engineering mechanics, Vol. 136 N° 2 (Fevrier 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 2 (Fevrier 2010) . - pp. 131-142 Titre : Reduction-based model updating of a scaled offshore platform structure Type de document : texte imprimé Auteurs : Li, Hui, Auteur ; Ding, Hua, Auteur Article en page(s) : pp. 131-142 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Offshore  structures  Platforms  Finite  element  method  Numerical  models. Résumé : This paper attempts to develop a reduction-based model updating technique for jacket offshore platform structure. A reduced model is used instead of the direct finite-element model of the real structure in order to circumvent such difficulties as huge degrees of freedom and incomplete experimental data that are usually civil engineers' trouble during the model updating. The whole process consists of three steps: reduction of FE model, the first model updating to minimize the reduction error, and the second model updating to minimize the modeling error of the reduced model and the real structure. According to the performance of jacket platforms, a local-rigidity assumption is employed to obtain the reduced model. The technique is applied in a downscale model of a four-legged offshore platform where its effectiveness is well proven. Furthermore, a comparison between the real structure and its numerical models in the following model validation shows that the updated models have good approximation to the real structure. Besides, some difficulties in the field of model updating are also discussed. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Reduction-based model updating of a scaled offshore platform structure [texte imprimé] / Li, Hui, Auteur ; Ding, Hua, Auteur . - pp. 131-142. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 2 (Fevrier 2010) . - pp. 131-142 Mots-clés : Offshore  structures  Platforms  Finite  element  method  Numerical  models. Résumé : This paper attempts to develop a reduction-based model updating technique for jacket offshore platform structure. A reduced model is used instead of the direct finite-element model of the real structure in order to circumvent such difficulties as huge degrees of freedom and incomplete experimental data that are usually civil engineers' trouble during the model updating. The whole process consists of three steps: reduction of FE model, the first model updating to minimize the reduction error, and the second model updating to minimize the modeling error of the reduced model and the real structure. According to the performance of jacket platforms, a local-rigidity assumption is employed to obtain the reduced model. The technique is applied in a downscale model of a four-legged offshore platform where its effectiveness is well proven. Furthermore, a comparison between the real structure and its numerical models in the following model validation shows that the updated models have good approximation to the real structure. Besides, some difficulties in the field of model updating are also discussed. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]

Silica - supported tin oxides as heterogeneous acid catalysts for transesterification of soybean oil with methanol / Wenlei Xie in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Permalink