Documents disponibles écrits par cet auteur

Data-driven fault detection in aircraft engines with noisy sensor measurements / Sarkar, Soumik in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 133 N° 8 (Août 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 8 (Août 2011) . - 10 p. Titre : Data-driven fault detection in aircraft engines with noisy sensor measurements Type de document : texte imprimé Auteurs : Sarkar, Soumik, Auteur ; Xin Jin, Auteur ; Ray, Asok, Auteur Année de publication : 2011 Article en page(s) : 10 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Aerospace  engines  Aerospace  simulation  Aircraft  testing  Fault  location  Feature  extraction  Gas  turbines  Pattern  classification  Sensors  Time  series Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : An inherent difficulty in sensor-data-driven fault detection is that the detection performance could be drastically reduced under sensor degradation (e.g., drift and noise). Complementary to traditional model-based techniques for fault detection, this paper proposes symbolic dynamic filtering by optimally partitioning the time series data of sensor observation. The objective here is to mask the effects of sensor noise level variation and magnify the system fault signatures. In this regard, the concepts of feature extraction and pattern classification are used for fault detection in aircraft gas turbine engines. The proposed methodology of data-driven fault detection is tested and validated on the Commercial Modular Aero-Propulsion System Simulation (C-MAPSS) test-bed developed by NASA for noisy (i.e., increased variance) sensor signals. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...] [article] Data-driven fault detection in aircraft engines with noisy sensor measurements [texte imprimé] / Sarkar, Soumik, Auteur ; Xin Jin, Auteur ; Ray, Asok, Auteur . - 2011 . - 10 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 8 (Août 2011) . - 10 p. Mots-clés : Aerospace  engines  Aerospace  simulation  Aircraft  testing  Fault  location  Feature  extraction  Gas  turbines  Pattern  classification  Sensors  Time  series Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : An inherent difficulty in sensor-data-driven fault detection is that the detection performance could be drastically reduced under sensor degradation (e.g., drift and noise). Complementary to traditional model-based techniques for fault detection, this paper proposes symbolic dynamic filtering by optimally partitioning the time series data of sensor observation. The objective here is to mask the effects of sensor noise level variation and magnify the system fault signatures. In this regard, the concepts of feature extraction and pattern classification are used for fault detection in aircraft gas turbine engines. The proposed methodology of data-driven fault detection is tested and validated on the Commercial Modular Aero-Propulsion System Simulation (C-MAPSS) test-bed developed by NASA for noisy (i.e., increased variance) sensor signals. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...]

Fast - rate – constant - rate oxidation kinetics model for asphalt binders / Xin Jin in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13373-13379 Titre : Fast - rate – constant - rate oxidation kinetics model for asphalt binders Type de document : texte imprimé Auteurs : Xin Jin, Auteur ; Rongbin Han, Auteur ; Yuanchen Cui, Auteur Année de publication : 2012 Article en page(s) : pp. 13373-13379 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling  Binders  Kinetic  model  Oxidation  Kinetics  Rate  constant Résumé : Asphalt oxidative aging at constant temperature is characterized by a declining fast-rate period and a constant-rate period. While constant-rate reaction kinetics are known for many asphalt materials, much less is known about the equally important fast-rate region. Fifteen modified and unmodified asphalts were aged at five temperatures in 1 atm air, with samples collected during both fast-rate and constant-rate periods. Arrhenius kinetics parameters were obtained for both reactions; an additional parameter characterizes the total oxidation that occurs by the fast-rate, first-order reaction. Interestingly, the data show correlations between the kinetics parameters. Viscosity hardening in response to oxidation, as characterized by hardening susceptibility, is not significantly different for the two aging periods for a single binder. Therefore, the combined first-order, zero-order oxidation model together with hardening susceptibility is capable of modeling asphalt oxidation and hardening. Such a capability is fundamentally important to modeling pavement oxidation, to predicting pavement performance, and to improving pavement design. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267495 [article] Fast - rate – constant - rate oxidation kinetics model for asphalt binders [texte imprimé] / Xin Jin, Auteur ; Rongbin Han, Auteur ; Yuanchen Cui, Auteur . - 2012 . - pp. 13373-13379. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13373-13379 Mots-clés : Modeling  Binders  Kinetic  model  Oxidation  Kinetics  Rate  constant Résumé : Asphalt oxidative aging at constant temperature is characterized by a declining fast-rate period and a constant-rate period. While constant-rate reaction kinetics are known for many asphalt materials, much less is known about the equally important fast-rate region. Fifteen modified and unmodified asphalts were aged at five temperatures in 1 atm air, with samples collected during both fast-rate and constant-rate periods. Arrhenius kinetics parameters were obtained for both reactions; an additional parameter characterizes the total oxidation that occurs by the fast-rate, first-order reaction. Interestingly, the data show correlations between the kinetics parameters. Viscosity hardening in response to oxidation, as characterized by hardening susceptibility, is not significantly different for the two aging periods for a single binder. Therefore, the combined first-order, zero-order oxidation model together with hardening susceptibility is capable of modeling asphalt oxidation and hardening. Such a capability is fundamentally important to modeling pavement oxidation, to predicting pavement performance, and to improving pavement design. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267495

Platform-independent MB-based AVS video standard implementation / Xin Jin in Signal processing. Image communication, Vol. 24 N° 4 (Avril 2009) 

Public ISBD [article]  in Signal processing. Image communication > Vol. 24 N° 4 (Avril 2009) . - pp. 312-323 Titre : Platform-independent MB-based AVS video standard implementation Type de document : texte imprimé Auteurs : Xin Jin, Auteur ; Songnan Li, Auteur ; King Ngi Ngan, Auteur Article en page(s) : pp. 312-323 Note générale : Electronique Langues : Anglais (eng) Mots-clés : AVS  video  standard  MB-based  architecture  Frame-based  architecture  Embedded  video  codec  implementation  Video  coding Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs Résumé : AVS1-P2 is the newest video standard of Audio Video coding Standard (AVS) workgroup of China, which provides close performance to H.264/AVC main profile with lower complexity. In this paper, a platform-independent software package with macroblock-based (MB-based) architecture is proposed to facilitate AVS video standard implementation on embedded system. Compared with the frame-based architecture, which is commonly utilized for PC platform oriented video applications, the MB-based decoder performs all of the decoding processes, except the high-level syntax parsing, in a set of MB-based buffers with adequate size for saving the information of the current MB and the neighboring reference MBs to minimize the on-chip memory and to save the time consumed in on-chip/off-chip data transfer. By modifying the data flow and decoding hierarchy, simulating the data transfer between the on-chip memory and the off-chip memory, and modularizing the buffer definition and management for low-level decoding kernels, the MB-based system architecture provides over 80% reduction in on-chip memory compared to the frame-based architecture when decoding 720p sequences. The storage complexity is also analyzed by referencing the performance evaluation of the MB-based decoder. The MB-based decoder implementation provides an efficient reference to facilitate development of AVS applications on embedded system. The complexity analysis provides rough storage complexity requirements for AVS video standard implementation and optimization. DEWEY : 361.382 ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...] [article] Platform-independent MB-based AVS video standard implementation [texte imprimé] / Xin Jin, Auteur ; Songnan Li, Auteur ; King Ngi Ngan, Auteur . - pp. 312-323. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 24 N° 4 (Avril 2009) . - pp. 312-323 Mots-clés : AVS  video  standard  MB-based  architecture  Frame-based  architecture  Embedded  video  codec  implementation  Video  coding Index. décimale : 621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs Résumé : AVS1-P2 is the newest video standard of Audio Video coding Standard (AVS) workgroup of China, which provides close performance to H.264/AVC main profile with lower complexity. In this paper, a platform-independent software package with macroblock-based (MB-based) architecture is proposed to facilitate AVS video standard implementation on embedded system. Compared with the frame-based architecture, which is commonly utilized for PC platform oriented video applications, the MB-based decoder performs all of the decoding processes, except the high-level syntax parsing, in a set of MB-based buffers with adequate size for saving the information of the current MB and the neighboring reference MBs to minimize the on-chip memory and to save the time consumed in on-chip/off-chip data transfer. By modifying the data flow and decoding hierarchy, simulating the data transfer between the on-chip memory and the off-chip memory, and modularizing the buffer definition and management for low-level decoding kernels, the MB-based system architecture provides over 80% reduction in on-chip memory compared to the frame-based architecture when decoding 720p sequences. The storage complexity is also analyzed by referencing the performance evaluation of the MB-based decoder. The MB-based decoder implementation provides an efficient reference to facilitate development of AVS applications on embedded system. The complexity analysis provides rough storage complexity requirements for AVS video standard implementation and optimization. DEWEY : 361.382 ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%23 [...]