Analysis of resonant frequency of moving magnet linear compressor of stirling cryocooler / Ming Xia in International journal of refrigeration, Vol. 33 N° 4 (Juin 2010)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 739-744 Titre : Analysis of resonant frequency of moving magnet linear compressor of stirling cryocooler Titre original : Analyse de la fréquence de résonance du compresseur linéaire magnétique et mobile d'un cryorefroidisseur de Stirling Type de document : texte imprimé Auteurs : Ming Xia, Auteur ; Xiaoping Chen, Auteur Année de publication : 2010 Article en page(s) : pp. 739-744 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Cryocooler Stirling Simulation Computational fluid dynamics Frequency Resonance Magnetic compressor Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper analyzes resonant frequency of the moving magnet linear compressor of Stirling cryocooler. The CFD (Computational Fluid Dynamics) and FEM (Finite Element Method) are used for the analysis of resonant frequency with FLUENT 6.2 and ANSYS 11.0 and an experiment is designed for testing the resonant frequency of moving magnet linear compressor. Results from simulations and experiments showed that the resonant frequency of the moving magnet linear compressors is affected by the machine spring, the gas spring, the magnet spring, and the mass of moving assembly, while the resonant frequency of the moving coil linear compressors is only affected by the machine spring, the gas spring, and the mass of moving assembly. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000162 [article] Analysis of resonant frequency of moving magnet linear compressor of stirling cryocooler = Analyse de la fréquence de résonance du compresseur linéaire magnétique et mobile d'un cryorefroidisseur de Stirling [texte imprimé] / Ming Xia, Auteur ; Xiaoping Chen, Auteur . - 2010 . - pp. 739-744. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 739-744 Mots-clés : Cryocooler Stirling Simulation Computational fluid dynamics Frequency Resonance Magnetic compressor Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper analyzes resonant frequency of the moving magnet linear compressor of Stirling cryocooler. The CFD (Computational Fluid Dynamics) and FEM (Finite Element Method) are used for the analysis of resonant frequency with FLUENT 6.2 and ANSYS 11.0 and an experiment is designed for testing the resonant frequency of moving magnet linear compressor. Results from simulations and experiments showed that the resonant frequency of the moving magnet linear compressors is affected by the machine spring, the gas spring, the magnet spring, and the mass of moving assembly, while the resonant frequency of the moving coil linear compressors is only affected by the machine spring, the gas spring, and the mass of moving assembly. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000162

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Design and control of extractive dividing-wall column for separating methylal–methanol mixture / Ming Xia in Industrial & engineering chemistry research, Vol. 51 N° 49 (Décembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 16016–16033 Titre : Design and control of extractive dividing-wall column for separating methylal–methanol mixture Type de document : texte imprimé Auteurs : Ming Xia, Auteur ; Baoru Yu, Auteur ; Qiaoyi Wang, Auteur Année de publication : 2013 Article en page(s) : pp. 16016–16033 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Control extractive Résumé : The design and control of extractive dividing-wall columns (EDWCs) have not yet been investigated, whereas those of dividing-wall columns (DWCs) and conventional extractive distillation columns (CEDCs) have been studied by many researchers. The control of EDWCs is more difficult than that of CEDCs and somewhat different from that of DWCs because of differences in the inner structure and interactions among control loops in EDWCs. In this work, the design and control of an EDWC for methylal/methanol separation are investigated using commercial chemical simulators (Aspen Plus and Aspen Dynamics). The optimum EDWC design based on the total annual cost (TAC) is screened first; then, the interaction between design and control is observed; and finally, two control structures for the EDWC are presented. The first proposed basic control structure featuring four composition controllers and an adjustable vapor split ratio αV can handle all disturbances well with small offsets in product purities, except for a 20% decrease in feed flow rate with a large deviation in methanol product purity. Then, an improved control structure with the QR/F ratio is established. The large deviation is effectively suppressed, and all of the disturbances are well rejected with small offsets in product purities. It is also revealed that the vapor split ratio αV at the bottom edge of dividing wall must be adjusted at least for composition disturbances of key feed components. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3015395 [article] Design and control of extractive dividing-wall column for separating methylal–methanol mixture [texte imprimé] / Ming Xia, Auteur ; Baoru Yu, Auteur ; Qiaoyi Wang, Auteur . - 2013 . - pp. 16016–16033. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 16016–16033 Mots-clés : Control extractive Résumé : The design and control of extractive dividing-wall columns (EDWCs) have not yet been investigated, whereas those of dividing-wall columns (DWCs) and conventional extractive distillation columns (CEDCs) have been studied by many researchers. The control of EDWCs is more difficult than that of CEDCs and somewhat different from that of DWCs because of differences in the inner structure and interactions among control loops in EDWCs. In this work, the design and control of an EDWC for methylal/methanol separation are investigated using commercial chemical simulators (Aspen Plus and Aspen Dynamics). The optimum EDWC design based on the total annual cost (TAC) is screened first; then, the interaction between design and control is observed; and finally, two control structures for the EDWC are presented. The first proposed basic control structure featuring four composition controllers and an adjustable vapor split ratio αV can handle all disturbances well with small offsets in product purities, except for a 20% decrease in feed flow rate with a large deviation in methanol product purity. Then, an improved control structure with the QR/F ratio is established. The large deviation is effectively suppressed, and all of the disturbances are well rejected with small offsets in product purities. It is also revealed that the vapor split ratio αV at the bottom edge of dividing wall must be adjusted at least for composition disturbances of key feed components. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3015395

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