Feedback control structures, embedded residual signals, and feedback control schemes with an integrated residual access / S. X. Ding in IEEE Transactions on control systems technology, Vol. 18 N° 2 (Mars 2010)  

Public ISBD [article]  inIEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 352-367 Titre : Feedback control structures, embedded residual signals, and feedback control schemes with an integrated residual access Type de document : texte imprimé Auteurs : S. X. Ding, Auteur ; G. Yang, Auteur ; P. Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 352-367 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Automotive systems Fault detection Feedback Observer Residual generation Index. décimale : 629.1 Résumé : Driven by the increasing needs for the integration of model-based fault diagnosis into the electronic control units (ECUs) with limited computation capacity and motivated by the recent study on the fault tolerant controller architecture, we investigate feedback controller structures aiming at accessing the residuals embedded in the control loops. For this purpose, we first develop an observer-based realization of the Youla parameterization. This result reveals a new interpretation of control signals as a composite of the residual and reference signals. From this viewpoint, different control schemes are studied and useful relationships between the controller structures and embedded residual signals are established. It leads to the development of two kinds of schemes: 1) extracting residual signals from an existing control loop and 2) configuring control loops with an integrated residual access. The achieved results are demonstrated by two examples of the feedback control loops in engine management systems. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152954 [article] Feedback control structures, embedded residual signals, and feedback control schemes with an integrated residual access [texte imprimé] / S. X. Ding, Auteur ; G. Yang, Auteur ; P. Zhang, Auteur . - 2011 . - pp. 352-367. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 352-367 Mots-clés : Automotive systems Fault detection Feedback Observer Residual generation Index. décimale : 629.1 Résumé : Driven by the increasing needs for the integration of model-based fault diagnosis into the electronic control units (ECUs) with limited computation capacity and motivated by the recent study on the fault tolerant controller architecture, we investigate feedback controller structures aiming at accessing the residuals embedded in the control loops. For this purpose, we first develop an observer-based realization of the Youla parameterization. This result reveals a new interpretation of control signals as a composite of the residual and reference signals. From this viewpoint, different control schemes are studied and useful relationships between the controller structures and embedded residual signals are established. It leads to the development of two kinds of schemes: 1) extracting residual signals from an existing control loop and 2) configuring control loops with an integrated residual access. The achieved results are demonstrated by two examples of the feedback control loops in engine management systems. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152954

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Pressure drop and heat transfer characteristics of clathrate hydrate slurry in a plate heat exchanger / Z.W. Ma in International journal of refrigeration, Vol. 34 N° 3 (Mai 2011)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 796-806 Titre : Pressure drop and heat transfer characteristics of clathrate hydrate slurry in a plate heat exchanger Titre original : Chute de pression et caractéristiques du transfert de chaleur d'un coulis d'hydrate de clathrate dans un échangeur de chaleur à plaques Type de document : texte imprimé Auteurs : Z.W. Ma, Auteur ; P. Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 796-806 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat exchanger Pressure drop transfer Slurry Clathrate Hydrate Tetrabutylammonium bromide Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Pressure drop and heat transfer characteristics of 0–17.5 vol% tetrabutylammonium bromide (TBAB) clathrate hydrate slurry (CHS) as a secondary refrigerant flowing through a plate heat exchanger (PHE) were investigated in the present research. It was found that the pressure drop of TBAB CHS was about 3.0–50.0 kPa which was about 1.2–2 times of that of the chilled water at the flow rate of 2.5–13.0 L min−1. The pressure drop increased with the increase of the volume fraction. Variation of the pressure drop with the modified Reynolds number was discussed and compared with that of the ice slurry. Flow friction factor correlation and local heat transfer correlation for TBAB CHS flowing through PHE were both proposed based on the experimental data. In addition, the influential factors, such as the inlet water temperature and inlet CHS volume fraction, on the overall heat transfer coefficient were discussed. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002975 [article] Pressure drop and heat transfer characteristics of clathrate hydrate slurry in a plate heat exchanger = Chute de pression et caractéristiques du transfert de chaleur d'un coulis d'hydrate de clathrate dans un échangeur de chaleur à plaques [texte imprimé] / Z.W. Ma, Auteur ; P. Zhang, Auteur . - 2011 . - pp. 796-806. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 796-806 Mots-clés : Heat exchanger Pressure drop transfer Slurry Clathrate Hydrate Tetrabutylammonium bromide Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Pressure drop and heat transfer characteristics of 0–17.5 vol% tetrabutylammonium bromide (TBAB) clathrate hydrate slurry (CHS) as a secondary refrigerant flowing through a plate heat exchanger (PHE) were investigated in the present research. It was found that the pressure drop of TBAB CHS was about 3.0–50.0 kPa which was about 1.2–2 times of that of the chilled water at the flow rate of 2.5–13.0 L min−1. The pressure drop increased with the increase of the volume fraction. Variation of the pressure drop with the modified Reynolds number was discussed and compared with that of the ice slurry. Flow friction factor correlation and local heat transfer correlation for TBAB CHS flowing through PHE were both proposed based on the experimental data. In addition, the influential factors, such as the inlet water temperature and inlet CHS volume fraction, on the overall heat transfer coefficient were discussed. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002975

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Solid fraction determination in cold storage by tetra-n-butyl ammonium bromide clathrate hydrate slurry / P. Zhang in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 809–819 Titre : Solid fraction determination in cold storage by tetra-n-butyl ammonium bromide clathrate hydrate slurry Titre original : Détermination de la fraction solide lors de l'accumulation thermique à l'aide d'un coulis de clathrate d'hydrate au bromure de tétra-n-butylammonium Type de document : texte imprimé Auteurs : P. Zhang, Auteur ; X. J. Shi, Auteur ; Z.W. Ma, Auteur Année de publication : 2013 Article en page(s) : pp. 809–819 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Cold storage  Solid fraction distribution  TBAB clathrate hydrate slurry  Crystal particle  Non-Newtonian fluid Résumé : Thermal or cold storage by phase change material slurry attracted many attentions in recent years, in which solid fraction distribution in the storage tank is an important issue due to different densities of the solid particle and carrier fluid. Tetra-n-butyl ammonium bromide (TBAB) clathrate hydrate slurry (CHS) has recently been intensively investigated for the purpose of the cold storage. In the present study, solid fraction distribution of TBAB CHS in a cold storage tank was both experimentally and numerically investigated. The different sedimentation characteristics of type A and type B TBAB CHS were identified. It was shown that high-capacity cold storage can be achieved by taking advantage of the sedimentation of type A TBAB CHS, based on which a procedure to realize it was also proposed. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003118 [article] Solid fraction determination in cold storage by tetra-n-butyl ammonium bromide clathrate hydrate slurry = Détermination de la fraction solide lors de l'accumulation thermique à l'aide d'un coulis de clathrate d'hydrate au bromure de tétra-n-butylammonium [texte imprimé] / P. Zhang, Auteur ; X. J. Shi, Auteur ; Z.W. Ma, Auteur . - 2013 . - pp. 809–819. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 809–819 Mots-clés : Cold storage  Solid fraction distribution  TBAB clathrate hydrate slurry  Crystal particle  Non-Newtonian fluid Résumé : Thermal or cold storage by phase change material slurry attracted many attentions in recent years, in which solid fraction distribution in the storage tank is an important issue due to different densities of the solid particle and carrier fluid. Tetra-n-butyl ammonium bromide (TBAB) clathrate hydrate slurry (CHS) has recently been intensively investigated for the purpose of the cold storage. In the present study, solid fraction distribution of TBAB CHS in a cold storage tank was both experimentally and numerically investigated. The different sedimentation characteristics of type A and type B TBAB CHS were identified. It was shown that high-capacity cold storage can be achieved by taking advantage of the sedimentation of type A TBAB CHS, based on which a procedure to realize it was also proposed. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003118

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