Fault diagnosis of MEMS lateral comb resonators using multiple-model adaptive estimators / Afshin Izadian in IEEE Transactions on control systems technology, Vol. 18 N° 5 (Septembre 2010)  

Public ISBD [article]  inIEEE Transactions on control systems technology > Vol. 18 N° 5 (Septembre 2010) . - pp. 1233-1240 Titre : Fault diagnosis of MEMS lateral comb resonators using multiple-model adaptive estimators Type de document : texte imprimé Auteurs : Afshin Izadian, Auteur ; Parviz Famouri, Auteur Année de publication : 2011 Article en page(s) : pp. 1233-1240 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Adaptive estimators Fault diagnosis Kalman filtering Lateral comb resonators (LCRs) Index. décimale : 629.1 Résumé : In this brief a fault diagnostic unit is developed for microelectromechanical systems (MEMS) by means of multiple model adaptive estimation technique. Fault modeling tools such as contamination and reliability analysis of microelectromechanical layout enabled interpretation of microsystems behavior by evaluating their structural variations and modeling them in form of electric circuits. This technique cannot directly diagnose the faults during operation of microsystems. However, these fault-representing models can be used in multiple model adaptive estimation technique to form fault diagnosis units. Here, fault-representing systems are modeled by Kalman filters in real-time applications and are used to evaluate the fault in microsystems. MEMS lateral comb resonators are fabricated to experimentally demonstrate the fault diagnosis performance in multiple model adaptive estimation technique. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5406017 [article] Fault diagnosis of MEMS lateral comb resonators using multiple-model adaptive estimators [texte imprimé] / Afshin Izadian, Auteur ; Parviz Famouri, Auteur . - 2011 . - pp. 1233-1240. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 5 (Septembre 2010) . - pp. 1233-1240 Mots-clés : Adaptive estimators Fault diagnosis Kalman filtering Lateral comb resonators (LCRs) Index. décimale : 629.1 Résumé : In this brief a fault diagnostic unit is developed for microelectromechanical systems (MEMS) by means of multiple model adaptive estimation technique. Fault modeling tools such as contamination and reliability analysis of microelectromechanical layout enabled interpretation of microsystems behavior by evaluating their structural variations and modeling them in form of electric circuits. This technique cannot directly diagnose the faults during operation of microsystems. However, these fault-representing models can be used in multiple model adaptive estimation technique to form fault diagnosis units. Here, fault-representing systems are modeled by Kalman filters in real-time applications and are used to evaluate the fault in microsystems. MEMS lateral comb resonators are fabricated to experimentally demonstrate the fault diagnosis performance in multiple model adaptive estimation technique. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5406017

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Prediction of solids circulation rate of cork particles in an ambient-pressure pilot-scale circulating fluidized bed / Yue Huang in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 134-141 Titre : Prediction of solids circulation rate of cork particles in an ambient-pressure pilot-scale circulating fluidized bed Type de document : texte imprimé Auteurs : Yue Huang, Éditeur scientifique ; Richard Turton, Éditeur scientifique ; Parviz Famouri, Éditeur scientifique Année de publication : 2009 Article en page(s) : p. 134-141 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Solids Circulation Cork Particles Circulating fluidized beds (CFB) Standpipe particles Résumé : Circulating fluidized beds (CFB) are currently used in many industrial processes for noncatalytic and catalytic gas-solid reactions. The prediction of solids flow rate is important because its effective control is the key to smooth operation of a CFB system. This paper presents a method for solids flow metering from pressure drop measurements in the standpipe dense phase. A model based on the Ergun equation is developed to predict the solids flow rate and voidage in the dense phase of the standpipe. The profile of the solids flow rate under unsteady state is also presented. With the use of this method, the dynamic response time at different locations along the standpipe of a pilot-scale fluidized bed operating at ambient conditions with 812 μm cork particles is estimated successfully. Through the use of a pressure balance analysis, solids flow models for the standpipe, riser, and other sections of the flow loop are combined to give an integrated CFB model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8001843 [article] Prediction of solids circulation rate of cork particles in an ambient-pressure pilot-scale circulating fluidized bed [texte imprimé] / Yue Huang, Éditeur scientifique ; Richard Turton, Éditeur scientifique ; Parviz Famouri, Éditeur scientifique . - 2009 . - p. 134-141. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 134-141 Mots-clés : Solids Circulation Cork Particles Circulating fluidized beds (CFB) Standpipe particles Résumé : Circulating fluidized beds (CFB) are currently used in many industrial processes for noncatalytic and catalytic gas-solid reactions. The prediction of solids flow rate is important because its effective control is the key to smooth operation of a CFB system. This paper presents a method for solids flow metering from pressure drop measurements in the standpipe dense phase. A model based on the Ergun equation is developed to predict the solids flow rate and voidage in the dense phase of the standpipe. The profile of the solids flow rate under unsteady state is also presented. With the use of this method, the dynamic response time at different locations along the standpipe of a pilot-scale fluidized bed operating at ambient conditions with 812 μm cork particles is estimated successfully. Through the use of a pressure balance analysis, solids flow models for the standpipe, riser, and other sections of the flow loop are combined to give an integrated CFB model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8001843

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