Documents disponibles écrits par cet auteur

Embedded interval type - 2 T - S fuzzy time / space separation modeling approach for nonlinear distributed parameter system / Mengling Wang in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13954–13961 Titre : Embedded interval type - 2 T - S fuzzy time / space separation modeling approach for nonlinear distributed parameter system Type de document : texte imprimé Auteurs : Mengling Wang, Auteur ; Ning Li, Auteur ; Shaoyuan Li, Auteur Année de publication : 2012 Article en page(s) : pp. 13954–13961 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Distributed  parameter  system  Modeling Résumé : Challenging modeling problems include how to obtain a simple and accurate model for a partial differential equation (PDE) unknown nonlinear distributed parameter system (DPS). In this paper, a time/space separation modeling approach based on the interval type-2 T-S fuzzy model (IT2 T-S model) is proposed for nonlinear DPS. First, the spatial-temporal output is divided into a few dominant spatial basis functions and low-dimensional time series by a linear time/space separation method. Second, the interval type-2 T-S fuzzy model is determined from the low-dimensional time series to reconstruct the system dynamics through the spatial basis functions. As the IT2 T-S model employs an interval linear model in the consequent part, the relationship between the input and spatial output can be determined by linear expressions through type reduction and linear time/space reconstruction. Thus, the obtained model is suitable for control design. The simulation presents the accuracies and effectiveness of the proposed modeling methodologies. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299863 [article] Embedded interval type - 2 T - S fuzzy time / space separation modeling approach for nonlinear distributed parameter system [texte imprimé] / Mengling Wang, Auteur ; Ning Li, Auteur ; Shaoyuan Li, Auteur . - 2012 . - pp. 13954–13961. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13954–13961 Mots-clés : Distributed  parameter  system  Modeling Résumé : Challenging modeling problems include how to obtain a simple and accurate model for a partial differential equation (PDE) unknown nonlinear distributed parameter system (DPS). In this paper, a time/space separation modeling approach based on the interval type-2 T-S fuzzy model (IT2 T-S model) is proposed for nonlinear DPS. First, the spatial-temporal output is divided into a few dominant spatial basis functions and low-dimensional time series by a linear time/space separation method. Second, the interval type-2 T-S fuzzy model is determined from the low-dimensional time series to reconstruct the system dynamics through the spatial basis functions. As the IT2 T-S model employs an interval linear model in the consequent part, the relationship between the input and spatial output can be determined by linear expressions through type reduction and linear time/space reconstruction. Thus, the obtained model is suitable for control design. The simulation presents the accuracies and effectiveness of the proposed modeling methodologies. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299863

Freezing mechanism of supercooled water droplet impinging on metal surfaces / Guomin Yang in International journal of refrigeration, Vol. 34 N° 8 (Décembre 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 2007–2017 Titre : Freezing mechanism of supercooled water droplet impinging on metal surfaces Titre original : Mécanisme de congélation des gouttelettes d'eau surrefroidies impactant sur des surfaces métalliques Type de document : texte imprimé Auteurs : Guomin Yang, Auteur ; Kaihua Guo, Auteur ; Ning Li, Auteur Année de publication : 2012 Article en page(s) : pp. 2007–2017 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Supercooling  Water  Droplet  Freezing  Ice  Morphology Résumé : Ice accretion on power lines is a random natural phenomenon and may seriously harm to the safety of power network. However, the mechanism of the freezing process of supercooled water droplet impacting on wires is still not fully understood. In this study, an experimental investigation on the freezing mechanism of the supercooled water droplet impinging on cold metal surfaces was performed. The morphological characters and the dynamics of a single supercooled droplet collide on the cylindrical metal surfaces had been revealed with high-speed photographing. The experimental data for the surfaces of stainless steel, copper and aluminum, on which the supercooled droplets impinging with speeds of 2.3 m s−1 and 4.3 m s−1 had been plotted. The phenomena of instantaneous and non-instantaneous freezing of the supercooled impinging droplet were identified and the conditional boundaries for these two kinds of freezing were found statistically. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001629 [article] Freezing mechanism of supercooled water droplet impinging on metal surfaces = Mécanisme de congélation des gouttelettes d'eau surrefroidies impactant sur des surfaces métalliques [texte imprimé] / Guomin Yang, Auteur ; Kaihua Guo, Auteur ; Ning Li, Auteur . - 2012 . - pp. 2007–2017. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 2007–2017 Mots-clés : Supercooling  Water  Droplet  Freezing  Ice  Morphology Résumé : Ice accretion on power lines is a random natural phenomenon and may seriously harm to the safety of power network. However, the mechanism of the freezing process of supercooled water droplet impacting on wires is still not fully understood. In this study, an experimental investigation on the freezing mechanism of the supercooled water droplet impinging on cold metal surfaces was performed. The morphological characters and the dynamics of a single supercooled droplet collide on the cylindrical metal surfaces had been revealed with high-speed photographing. The experimental data for the surfaces of stainless steel, copper and aluminum, on which the supercooled droplets impinging with speeds of 2.3 m s−1 and 4.3 m s−1 had been plotted. The phenomena of instantaneous and non-instantaneous freezing of the supercooled impinging droplet were identified and the conditional boundaries for these two kinds of freezing were found statistically. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001629

Investigation of Bond Between Fiber Reinforced Polymer and Concrete Undergoing Global Mixed Mode I/II Loading / Wan, Baolin in Journal of engineering mechanics, Vol. 130 N°12 (Decembre 2004) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 130 N°12 (Decembre 2004) . - 1467-1475 p. Titre : Investigation of Bond Between Fiber Reinforced Polymer and Concrete Undergoing Global Mixed Mode I/II Loading Titre original : Recherche sur le Lien entre le Polymère de Tissu-Renforcé et le Béton Subissant le Chargement Mélangé Global du Mode I/II Type de document : texte imprimé Auteurs : Wan, Baolin, Auteur ; Sutton, Michael A., Auteur ; Petrou, Michael F. ; Harries, Kent A. ; Ning Li ; Landis, Eric N., Editeur scientifique Article en page(s) : 1467-1475 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Cracking  Bonding  Digital  techniques  Fiber  reinforced  polymers  Criquage  Liaison  Techniques  digitales  Polymères  de  tissu-renforcé Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : A novel experimental method using modified double cantilever beam specimens and a customized test frame are introduced to evaluate bond characteristics and toughness of fiber reinforced polymer (FRP) composite overlays and a concrete substrate under mixed mode loading. A computer vision system is used to measure the crack location, near-tip deformations and crack opening displacement during the crack growth process. Digital image correlation is used to determine the crack opening displacement (COD) for flaws growing in the vicinity of the FRP–concrete interface. Results from this study indicate that during crack growth, (1) the Mode I component of COD is dominant for all angles of specimen loading, (2), the magnitude of the local Mode I component of COD is maximized when good bond quality is present and crack extension occurs within the mortar/concrete near the FRP–concrete interface and (3) good agreement exists between independent energy release rate estimates based upon both an approximate elastic double cantilever beam formulation and also use of the measured components of COD in a classical linear elastic expression. Une méthode expérimentale de roman en utilisant de doubles spécimens en porte-à-faux modifiés de faisceau et une armature adaptée aux besoins du client d'essai sont présentées pour évaluer des caractéristiques et la dureté en esclavage des recouvrements composés de tissu-renforcé du polymère (FRP) et d'un substrat concret sous le chargement mélangé de mode. Un système de vision d'ordinateur est employé pour mesurer l'endroit de fente, près des déformations de bout et du déplacement d'ouverture de fente pendant le procédé de progression de la fissure. La corrélation d'image de Digital est employée pour déterminer le déplacement d'ouverture de fente (MORUE) pour des pailles accroissant à proximité de l'interface FRP-concrète. Les résultats de cette étude indiquent cela pendant la progression de la fissure, (1) le composant du mode I de la MORUE est dominant pour tous les angles du chargement de spécimen, (2), l'importance du composant local du mode I de la MORUE est maximisée quand la bonne qualité en esclavage est présente et prolongation de fente se produit dans le mortier/proche concret l'interface concrète de FRP et (3) la bonne concordance existe entre les évaluations indépendantes de taux de rejets d'énergie basées sur une double formulation en porte-à-faux élastique approximative de faisceau et également l'utilisation des composants mesurés de la MORUE dans une expression élastique linéaire classique. DEWEY : 620.1 ISSN : 0733-9399 En ligne : baolin.wan@marquette.edu, sutton@engr.sc.edu, petrou@ucy.ac.cy, kharries@engr.pi [...] [article] Investigation of Bond Between Fiber Reinforced Polymer and Concrete Undergoing Global Mixed Mode I/II Loading = Recherche sur le Lien entre le Polymère de Tissu-Renforcé et le Béton Subissant le Chargement Mélangé Global du Mode I/II [texte imprimé] / Wan, Baolin, Auteur ; Sutton, Michael A., Auteur ; Petrou, Michael F. ; Harries, Kent A. ; Ning Li ; Landis, Eric N., Editeur scientifique . - 1467-1475 p. Génie Mécanique Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 130 N°12 (Decembre 2004) . - 1467-1475 p. Mots-clés : Cracking  Bonding  Digital  techniques  Fiber  reinforced  polymers  Criquage  Liaison  Techniques  digitales  Polymères  de  tissu-renforcé Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : A novel experimental method using modified double cantilever beam specimens and a customized test frame are introduced to evaluate bond characteristics and toughness of fiber reinforced polymer (FRP) composite overlays and a concrete substrate under mixed mode loading. A computer vision system is used to measure the crack location, near-tip deformations and crack opening displacement during the crack growth process. Digital image correlation is used to determine the crack opening displacement (COD) for flaws growing in the vicinity of the FRP–concrete interface. Results from this study indicate that during crack growth, (1) the Mode I component of COD is dominant for all angles of specimen loading, (2), the magnitude of the local Mode I component of COD is maximized when good bond quality is present and crack extension occurs within the mortar/concrete near the FRP–concrete interface and (3) good agreement exists between independent energy release rate estimates based upon both an approximate elastic double cantilever beam formulation and also use of the measured components of COD in a classical linear elastic expression. Une méthode expérimentale de roman en utilisant de doubles spécimens en porte-à-faux modifiés de faisceau et une armature adaptée aux besoins du client d'essai sont présentées pour évaluer des caractéristiques et la dureté en esclavage des recouvrements composés de tissu-renforcé du polymère (FRP) et d'un substrat concret sous le chargement mélangé de mode. Un système de vision d'ordinateur est employé pour mesurer l'endroit de fente, près des déformations de bout et du déplacement d'ouverture de fente pendant le procédé de progression de la fissure. La corrélation d'image de Digital est employée pour déterminer le déplacement d'ouverture de fente (MORUE) pour des pailles accroissant à proximité de l'interface FRP-concrète. Les résultats de cette étude indiquent cela pendant la progression de la fissure, (1) le composant du mode I de la MORUE est dominant pour tous les angles du chargement de spécimen, (2), l'importance du composant local du mode I de la MORUE est maximisée quand la bonne qualité en esclavage est présente et prolongation de fente se produit dans le mortier/proche concret l'interface concrète de FRP et (3) la bonne concordance existe entre les évaluations indépendantes de taux de rejets d'énergie basées sur une double formulation en porte-à-faux élastique approximative de faisceau et également l'utilisation des composants mesurés de la MORUE dans une expression élastique linéaire classique. DEWEY : 620.1 ISSN : 0733-9399 En ligne : baolin.wan@marquette.edu, sutton@engr.sc.edu, petrou@ucy.ac.cy, kharries@engr.pi [...]

Local modeling approach for spatially distributed system based on interval type - 2 T - S fuzzy sets / Mengling Wang in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4352–4359 Titre : Local modeling approach for spatially distributed system based on interval type - 2 T - S fuzzy sets Type de document : texte imprimé Auteurs : Mengling Wang, Auteur ; Ning Li, Auteur ; Shaoyuan Li, Auteur Année de publication : 2010 Article en page(s) : pp. 4352–4359 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Spatial  dynamics Résumé : It is important to choose the appropriate type of local model to reduce the model error for a spatially distributed system (SDS) under large uncertainties. In this paper, a new local modeling approach is proposed to estimate the spatial dynamics of SDS based on input output data. The interval type-2 T-S fuzzy model is developed to the local dynamics in consideration of the mutual influence of neighbor regions. The parameters and the proper fuzzy rules of the local models are obtained by using interval type-2 fuzzy satisfactory clustering algorithm. Then the global models can be determined by constructing the local models by smooth interpolation. The accuracies of the modeling methodologies are tested in the shell and tube heat exchanger. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901278r [article] Local modeling approach for spatially distributed system based on interval type - 2 T - S fuzzy sets [texte imprimé] / Mengling Wang, Auteur ; Ning Li, Auteur ; Shaoyuan Li, Auteur . - 2010 . - pp. 4352–4359. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4352–4359 Mots-clés : Spatial  dynamics Résumé : It is important to choose the appropriate type of local model to reduce the model error for a spatially distributed system (SDS) under large uncertainties. In this paper, a new local modeling approach is proposed to estimate the spatial dynamics of SDS based on input output data. The interval type-2 T-S fuzzy model is developed to the local dynamics in consideration of the mutual influence of neighbor regions. The parameters and the proper fuzzy rules of the local models are obtained by using interval type-2 fuzzy satisfactory clustering algorithm. Then the global models can be determined by constructing the local models by smooth interpolation. The accuracies of the modeling methodologies are tested in the shell and tube heat exchanger. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901278r

Mechanism of particle transport in a fully developed wake flow / Jun Yao in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10936-10948 Titre : Mechanism of particle transport in a fully developed wake flow Type de document : texte imprimé Auteurs : Jun Yao, Auteur ; Yanlin Zhao, Auteur ; Ning Li, Auteur Année de publication : 2012 Article en page(s) : pp. 10936-10948 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Wake  Particle  transport Résumé : In this paper, the time-dependent Navier-Stokes equations were integrated in time using a mixed explicit-implicit operator splitting rules. The spatial discretization was processed using the spectral-element method. Nonreflecting conditions were employed at the outflow boundary. Particles were traced by the Lagrangian approach based on one-way coupling between the continuous and the disperse phases. The simulation results of the flow field agree well with experimental data. Particles (St = 4) are found to concentrate in the regions between adjacent vortex structures (RAVS) together with other particles dispersed outside of vortex outlining the boundaries of the large-scale vortex structures, which is independent of the flow Reynolds number. Due to U-velocity component difference, at the entrance of RAVS the flow does "compact" on particles causing particle concentration, and it increases with the flow Reynolds number and particle size. The mechanism of particle transport in the wake flow mostly depends on the strong interactions between two alternative and successive shedding vortex structures with opposite sign. Particle transport in the wake flow could be briefly described as follows: moving around vortices and going ahead with vortices. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286468 [article] Mechanism of particle transport in a fully developed wake flow [texte imprimé] / Jun Yao, Auteur ; Yanlin Zhao, Auteur ; Ning Li, Auteur . - 2012 . - pp. 10936-10948. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10936-10948 Mots-clés : Wake  Particle  transport Résumé : In this paper, the time-dependent Navier-Stokes equations were integrated in time using a mixed explicit-implicit operator splitting rules. The spatial discretization was processed using the spectral-element method. Nonreflecting conditions were employed at the outflow boundary. Particles were traced by the Lagrangian approach based on one-way coupling between the continuous and the disperse phases. The simulation results of the flow field agree well with experimental data. Particles (St = 4) are found to concentrate in the regions between adjacent vortex structures (RAVS) together with other particles dispersed outside of vortex outlining the boundaries of the large-scale vortex structures, which is independent of the flow Reynolds number. Due to U-velocity component difference, at the entrance of RAVS the flow does "compact" on particles causing particle concentration, and it increases with the flow Reynolds number and particle size. The mechanism of particle transport in the wake flow mostly depends on the strong interactions between two alternative and successive shedding vortex structures with opposite sign. Particle transport in the wake flow could be briefly described as follows: moving around vortices and going ahead with vortices. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286468

Partial decoupling control for multivariable processes / Yuling Shen in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

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Time – space decomposition - based generalized predictive control of a transport - reaction process / Ning Li in Industrial & engineering chemistry research, Vol. 50 N° 20 (Octobre 2011) 

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