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Détail de l'auteur
Auteur Rasmussen, Bryan P.
Documents disponibles écrits par cet auteur
Affiner la rechercheControl-Oriented Modeling of Transcritical Vapor Compression Systems / Rasmussen, Bryan P. in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 126 N° 1 (Mars 2004)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 126 N° 1 (Mars 2004) . - 54-64 p.
Titre : Control-Oriented Modeling of Transcritical Vapor Compression Systems Titre original : Modèle de Commande-Orienté des Systèmes de Compression de Vapeur de Transcritical Type de document : texte imprimé Auteurs : Rasmussen, Bryan P., Auteur ; Alleyne, Andrew G., Auteur Article en page(s) : 54-64 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Dispositif de climatisation Modèle dynamique Climatisation transcritical Contrôleur Conception multivariable Modèle dynamique non-linéaire Index. décimale : 629.8 Résumé : This paper presents a methodology for developing a low order dynamic model of a transcritical air-conditioning system, specifically suited for multivariable controller design. An 11th-order nonlinear dynamic model of the system is derived using first principles. Analysis indicates that the system exhibits multiple time scale behavior, and that model reduction is appropriate. Model reduction using singular perturbation techniques yields physical insight as to which physical phenomena are relatively fast/slow, and a 5th-order dynamic model appropriate for multivariable controller design. Although all results shown are for a transcritical cycle, the methodology presented can easily be extended to subcritical cycles.
Cet article présente une méthodologie pour développer un modèle dynamique de bas ordre d'un dispositif de climatisation transcritical, spécifiquement adapté à la conception multivariable de contrôleur. Un modèle 11th-order dynamique non-linéaire du système est dérivé en utilisant les premiers principes. L'analyse indique que le système montre le comportement multiple d'échelle de temps, et que la réduction modèle est appropriée. La réduction modèle employant des techniques singulières de perturbation rapporte la perspicacité physique quant à laquelle les phénomènes physiques sont relativement fast/slow, et un approprié 5th-order modèle dynamique pour la conception multivariable de contrôleur. Bien que tous les résultats montrés soient pour un cycle transcritical, la méthodologie présentée peut facilement être prolongée aux cycles sous-critiques.En ligne : brasmuss@uiuc.edu, alleye@uiuc.edu [article] Control-Oriented Modeling of Transcritical Vapor Compression Systems = Modèle de Commande-Orienté des Systèmes de Compression de Vapeur de Transcritical [texte imprimé] / Rasmussen, Bryan P., Auteur ; Alleyne, Andrew G., Auteur . - 54-64 p.
Génie Mécanique
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 126 N° 1 (Mars 2004) . - 54-64 p.
Mots-clés : Dispositif de climatisation Modèle dynamique Climatisation transcritical Contrôleur Conception multivariable Modèle dynamique non-linéaire Index. décimale : 629.8 Résumé : This paper presents a methodology for developing a low order dynamic model of a transcritical air-conditioning system, specifically suited for multivariable controller design. An 11th-order nonlinear dynamic model of the system is derived using first principles. Analysis indicates that the system exhibits multiple time scale behavior, and that model reduction is appropriate. Model reduction using singular perturbation techniques yields physical insight as to which physical phenomena are relatively fast/slow, and a 5th-order dynamic model appropriate for multivariable controller design. Although all results shown are for a transcritical cycle, the methodology presented can easily be extended to subcritical cycles.
Cet article présente une méthodologie pour développer un modèle dynamique de bas ordre d'un dispositif de climatisation transcritical, spécifiquement adapté à la conception multivariable de contrôleur. Un modèle 11th-order dynamique non-linéaire du système est dérivé en utilisant les premiers principes. L'analyse indique que le système montre le comportement multiple d'échelle de temps, et que la réduction modèle est appropriée. La réduction modèle employant des techniques singulières de perturbation rapporte la perspicacité physique quant à laquelle les phénomènes physiques sont relativement fast/slow, et un approprié 5th-order modèle dynamique pour la conception multivariable de contrôleur. Bien que tous les résultats montrés soient pour un cycle transcritical, la méthodologie présentée peut facilement être prolongée aux cycles sous-critiques.En ligne : brasmuss@uiuc.edu, alleye@uiuc.edu
in IEEE Transactions on control systems technology > Vol. 18 N° 5 (Septembre 2010) . - pp. 1216-1225
Titre : Gain scheduled control of an air conditioning system using the youla parameterization Type de document : texte imprimé Auteurs : Rasmussen, Bryan P., Auteur ; Alleyne, Andrew G., Auteur Année de publication : 2011 Article en page(s) : pp. 1216-1225 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Air conditioning Gain-scheduling Heating Ventilation Lyapunov Nonlinear control Index. décimale : 629.1 Résumé : Vapor compression systems form the basis for the majority of air conditioning and refrigeration systems. A primary control challenge addressed here is the coupled nonlinear multiple-input-multiple-output (MIMO) dynamics associated with the multiphase heat and mass transfer in the primary refrigerant loop. This paper develops a MIMO gain scheduled control strategy to regulate system efficiency while meeting changing demands for cooling capacity. An approach based on the Youla parameterization is shown to be a generalization of the more common local controller network method, while exposing several degrees of design freedom that can be exploited to improve stability. The challenge of guaranteeing stability of the nonlinear closed loop systems, despite endogenous and arbitrarily fast gain scheduling, is addressed. Experimental results confirm the effectiveness of the proposed approach.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5339092 [article] Gain scheduled control of an air conditioning system using the youla parameterization [texte imprimé] / Rasmussen, Bryan P., Auteur ; Alleyne, Andrew G., Auteur . - 2011 . - pp. 1216-1225.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 5 (Septembre 2010) . - pp. 1216-1225
Mots-clés : Air conditioning Gain-scheduling Heating Ventilation Lyapunov Nonlinear control Index. décimale : 629.1 Résumé : Vapor compression systems form the basis for the majority of air conditioning and refrigeration systems. A primary control challenge addressed here is the coupled nonlinear multiple-input-multiple-output (MIMO) dynamics associated with the multiphase heat and mass transfer in the primary refrigerant loop. This paper develops a MIMO gain scheduled control strategy to regulate system efficiency while meeting changing demands for cooling capacity. An approach based on the Youla parameterization is shown to be a generalization of the more common local controller network method, while exposing several degrees of design freedom that can be exploited to improve stability. The challenge of guaranteeing stability of the nonlinear closed loop systems, despite endogenous and arbitrarily fast gain scheduling, is addressed. Experimental results confirm the effectiveness of the proposed approach.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5339092
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 12 p.
Titre : Moving-boundary heat exchanger models with variable outlet phase Type de document : texte imprimé Auteurs : Brian D. Eldredge, Auteur ; Rasmussen, Bryan P., Auteur ; Alleyne, Andrew G., Auteur Année de publication : 2009 Article en page(s) : 12 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : condenser/receiver model; evaporator/accumulator model; moving-boundary framework Résumé : Vapor compression cycle systems using accumulators and receivers inherently operate at or near a transition point involving changes of phase at the heat exchanger outlets. This work introduces a condenser/receiver model and an evaporator/accumulator model developed in the moving-boundary framework. These models use a novel extension of physical variable definitions to account for variations in refrigerant exit phase. System-level model validation results, which demonstrate the validity of the new models, are presented. The model accuracy is improved by recognizing the sensitivity of the models to refrigerant mass flow rate. The approach developed and the validated models provide a valuable tool for dynamic analysis and control design for vapor compression cycle systems. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Moving-boundary heat exchanger models with variable outlet phase [texte imprimé] / Brian D. Eldredge, Auteur ; Rasmussen, Bryan P., Auteur ; Alleyne, Andrew G., Auteur . - 2009 . - 12 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 12 p.
Mots-clés : condenser/receiver model; evaporator/accumulator model; moving-boundary framework Résumé : Vapor compression cycle systems using accumulators and receivers inherently operate at or near a transition point involving changes of phase at the heat exchanger outlets. This work introduces a condenser/receiver model and an evaporator/accumulator model developed in the moving-boundary framework. These models use a novel extension of physical variable definitions to account for variations in refrigerant exit phase. System-level model validation results, which demonstrate the validity of the new models, are presented. The model accuracy is improved by recognizing the sensitivity of the models to refrigerant mass flow rate. The approach developed and the validated models provide a valuable tool for dynamic analysis and control design for vapor compression cycle systems. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 607-614
Titre : On reducing evaporator superheat nonlinearity with control architecture Titre original : Diminution de la nature non linéaire de la surchauffe de l'évaporateur à l'aide de la conception de la régulation Type de document : texte imprimé Auteurs : Matthew S. Elliott, Auteur ; Rasmussen, Bryan P., Auteur Année de publication : 2010 Article en page(s) : pp. 607-614 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Refrigeration system Evaporator Direct expansion Process Regulation Superheat Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Evaporator superheat control is an important aspect of the operation of refrigeration and air conditioning systems; since the majority of cooling in these systems occurs through evaporation of two-phase refrigerant, the energy efficiency is dramatically improved by reducing the amount of superheat present. However, allowing refrigerant to leave the evaporator without completely vaporizing risks catastrophic damage to the compressor, so superior control is required at low superheat levels. One of the most significant challenges present in this control problem is the presence of significant nonlinearities in the response from the control input, e.g. expansion valve position, to evaporator superheat. This paper reveals how a particular control architecture inherently compensates for both the static and dynamic nonlinearities that dominate the valve-to superheat transient response. Furthermore, the control implementation only requires temperature measurements, which are frequently available in ordinary HVAC systems. Experimental results confirm the reduction of nonlinearities using the proposed approach, and the authors discuss the effect of actuator limitations on the nonlinearity compensation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002904 [article] On reducing evaporator superheat nonlinearity with control architecture = Diminution de la nature non linéaire de la surchauffe de l'évaporateur à l'aide de la conception de la régulation [texte imprimé] / Matthew S. Elliott, Auteur ; Rasmussen, Bryan P., Auteur . - 2010 . - pp. 607-614.
Génie Mécanique
Langues : Anglais (eng)
in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 607-614
Mots-clés : Refrigeration system Evaporator Direct expansion Process Regulation Superheat Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Evaporator superheat control is an important aspect of the operation of refrigeration and air conditioning systems; since the majority of cooling in these systems occurs through evaporation of two-phase refrigerant, the energy efficiency is dramatically improved by reducing the amount of superheat present. However, allowing refrigerant to leave the evaporator without completely vaporizing risks catastrophic damage to the compressor, so superior control is required at low superheat levels. One of the most significant challenges present in this control problem is the presence of significant nonlinearities in the response from the control input, e.g. expansion valve position, to evaporator superheat. This paper reveals how a particular control architecture inherently compensates for both the static and dynamic nonlinearities that dominate the valve-to superheat transient response. Furthermore, the control implementation only requires temperature measurements, which are frequently available in ordinary HVAC systems. Experimental results confirm the reduction of nonlinearities using the proposed approach, and the authors discuss the effect of actuator limitations on the nonlinearity compensation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002904
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 132 N° 1 (Janvier/Fevrier 2010) . - 12 p.
Titre : Stable controller interpolation and controller switching for LPV systems Type de document : texte imprimé Auteurs : Rasmussen, Bryan P., Auteur ; Young Joon Chang, Auteur Année de publication : 2010 Article en page(s) : 12 p. Note générale : Systèmes dynamiques Langues : Anglais (eng) Mots-clés : Closed loop systems Nonlinear control systems Stability Index. décimale : 629.8 Résumé : This paper examines the gain-scheduling problem with a particular focus on controller interpolation with guaranteed stability of the nonlinear closed-loop system. For linear parameter varying model representations, a method of interpolating between controllers utilizing the Youla parametrization is proposed. Quadratic stability despite fast scheduling is guaranteed by construction, while the characteristics of individual controllers designed a priori are recovered at critical design points. Methods for reducing the state dimension of the interpolated controller are also given. The capability of the proposed approach to guarantee stability despite arbitrarily fast transitions leads naturally to application to switched linear systems. The efficacy of the method is demonstrated in simulation using a multi-input, multi-output, nonminimum-phase system, while interpolating between two controllers of different sizes and structures. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013200 [...] [article] Stable controller interpolation and controller switching for LPV systems [texte imprimé] / Rasmussen, Bryan P., Auteur ; Young Joon Chang, Auteur . - 2010 . - 12 p.
Systèmes dynamiques
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 132 N° 1 (Janvier/Fevrier 2010) . - 12 p.
Mots-clés : Closed loop systems Nonlinear control systems Stability Index. décimale : 629.8 Résumé : This paper examines the gain-scheduling problem with a particular focus on controller interpolation with guaranteed stability of the nonlinear closed-loop system. For linear parameter varying model representations, a method of interpolating between controllers utilizing the Youla parametrization is proposed. Quadratic stability despite fast scheduling is guaranteed by construction, while the characteristics of individual controllers designed a priori are recovered at critical design points. Methods for reducing the state dimension of the interpolated controller are also given. The capability of the proposed approach to guarantee stability despite arbitrarily fast transitions leads naturally to application to switched linear systems. The efficacy of the method is demonstrated in simulation using a multi-input, multi-output, nonminimum-phase system, while interpolating between two controllers of different sizes and structures. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA00013200 [...]
