Documents disponibles écrits par cet auteur

Analysis and real-time testing of a controlled single-phase wavelet-modulated inverter for capacitor-run induction motors / Saleh, S. A. in IEEE transactions on energy conversion, Vol. 24 N°1 (Mars 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N°1 (Mars 2009) . - pp. 21 - 29 Titre : Analysis and real-time testing of a controlled single-phase wavelet-modulated inverter for capacitor-run induction motors Type de document : texte imprimé Auteurs : Saleh, S. A., Auteur ; Rahman, M. A., Auteur Année de publication : 2009 Article en page(s) : pp. 21 - 29 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Bridge  circuits;  induction  motor  drives;  invertors;  machine  control;  machine  testing;  switching  convertors;  wavelet  transforms Résumé : This paper presents the experimental performance of an inverter-fed single-phase ( 1Phi) capacitor-run induction motor (IM) drive. The new 1Phi voltage-source four-pulse H-bridge wavelet-modulated (WM) inverter is employed to implement the proposed 1Phi motor drive. The WM inverter is operated by switching pulses generated by a unique nondyadic wavelet basis-functions-based multiresolution analysis (MRA). The synthesis part of this MRA has a scale--time structure such that the scale increase/decrease patterns are related to the sign of the first derivative of the reference-modulating signal. Adjusting zero-crossing locations of the first derivative of the reference-modulating signal can change scales of successive dilated and shifted versions of the synthesis scaling function. This approach of changing inverter switching pulses is called the resolution-level control (RLC) strategy, and can be used to adjust the motor input voltage. The proposed 1Phi motor drive incorporating an RLC WM inverter is successfully implemented in real time using a digital signal processor board ds1102 for a 1/2 hp, 1750 r/min capacitor-run IM. The efficacy of the proposed WM-based 1Phi IM drive is verified by both simulation and experimental results at various operating conditions. A performance comparison with a conventional proportional-integral controller is also provided to show the superiority of the proposed technique. Simulation and experimental test results of the proposed WM-based drive demonstrate robust performance, simple implementation, significant dynamic response improvements, and an ability to maintain high-quality inverter outputs. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4781626&sortType%3Das [...] [article] Analysis and real-time testing of a controlled single-phase wavelet-modulated inverter for capacitor-run induction motors [texte imprimé] / Saleh, S. A., Auteur ; Rahman, M. A., Auteur . - 2009 . - pp. 21 - 29. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N°1 (Mars 2009) . - pp. 21 - 29 Mots-clés : Bridge  circuits;  induction  motor  drives;  invertors;  machine  control;  machine  testing;  switching  convertors;  wavelet  transforms Résumé : This paper presents the experimental performance of an inverter-fed single-phase ( 1Phi) capacitor-run induction motor (IM) drive. The new 1Phi voltage-source four-pulse H-bridge wavelet-modulated (WM) inverter is employed to implement the proposed 1Phi motor drive. The WM inverter is operated by switching pulses generated by a unique nondyadic wavelet basis-functions-based multiresolution analysis (MRA). The synthesis part of this MRA has a scale--time structure such that the scale increase/decrease patterns are related to the sign of the first derivative of the reference-modulating signal. Adjusting zero-crossing locations of the first derivative of the reference-modulating signal can change scales of successive dilated and shifted versions of the synthesis scaling function. This approach of changing inverter switching pulses is called the resolution-level control (RLC) strategy, and can be used to adjust the motor input voltage. The proposed 1Phi motor drive incorporating an RLC WM inverter is successfully implemented in real time using a digital signal processor board ds1102 for a 1/2 hp, 1750 r/min capacitor-run IM. The efficacy of the proposed WM-based 1Phi IM drive is verified by both simulation and experimental results at various operating conditions. A performance comparison with a conventional proportional-integral controller is also provided to show the superiority of the proposed technique. Simulation and experimental test results of the proposed WM-based drive demonstrate robust performance, simple implementation, significant dynamic response improvements, and an ability to maintain high-quality inverter outputs. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4781626&sortType%3Das [...]

Peak demand forecasting for a seasonal product using Bayesian approach / Rahman, M. A. in Journal of the operational research society (JORS), Vol. 62 N° 6 (Juin 2011) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 62 N° 6 (Juin 2011) . - pp. 1019–1028 Titre : Peak demand forecasting for a seasonal product using Bayesian approach Type de document : texte imprimé Auteurs : Rahman, M. A., Auteur ; Sarker, B. R., Auteur ; Escobar, L. A., Auteur Année de publication : 2011 Article en page(s) : pp. 1019–1028 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Bayesian  forecasting  method  Seasonal  demand  Incomplete  data  set Index. décimale : 001.424 Résumé : An actual demand-forecasting problem of the US apparel dealers is studied. Demand is highly fluctuating during the peak sale season and low prior to the peak season. The model is described by the continuous time stochastic process applying the Bayesian process. The standard gamma distribution is selected for the demand process and an inverse gamma distribution is chosen as the conjugate prior for the model. The choice is supported by the maximum likelihood estimate among a number of non-negative distribution models. The proposed Bayesian models predict the probability of the future demand expressed explicitly conditional on the observed demand prior to the peak season. The data set illustrates partial demand of a seasonal product procured by the US dealers from overseas. In recent years, hazard and operational risks due to weather disasters and equipment shutdowns were felt significantly. These caused supply chain disruption and unrecorded demand. The model is extended to contribute to forecast from an unrecorded data set due to supply disruption. Forecasts are compared with real data and a widely implemented adaptive Holt-Winters (H-W) seasonal forecasting model. Results show that the forecasts calculated by the proposed methods do better than those of the adaptive H-W model. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n6/abs/jors201058a.html [article] Peak demand forecasting for a seasonal product using Bayesian approach [texte imprimé] / Rahman, M. A., Auteur ; Sarker, B. R., Auteur ; Escobar, L. A., Auteur . - 2011 . - pp. 1019–1028. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 62 N° 6 (Juin 2011) . - pp. 1019–1028 Mots-clés : Bayesian  forecasting  method  Seasonal  demand  Incomplete  data  set Index. décimale : 001.424 Résumé : An actual demand-forecasting problem of the US apparel dealers is studied. Demand is highly fluctuating during the peak sale season and low prior to the peak season. The model is described by the continuous time stochastic process applying the Bayesian process. The standard gamma distribution is selected for the demand process and an inverse gamma distribution is chosen as the conjugate prior for the model. The choice is supported by the maximum likelihood estimate among a number of non-negative distribution models. The proposed Bayesian models predict the probability of the future demand expressed explicitly conditional on the observed demand prior to the peak season. The data set illustrates partial demand of a seasonal product procured by the US dealers from overseas. In recent years, hazard and operational risks due to weather disasters and equipment shutdowns were felt significantly. These caused supply chain disruption and unrecorded demand. The model is extended to contribute to forecast from an unrecorded data set due to supply disruption. Forecasts are compared with real data and a widely implemented adaptive Holt-Winters (H-W) seasonal forecasting model. Results show that the forecasts calculated by the proposed methods do better than those of the adaptive H-W model. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n6/abs/jors201058a.html

Wetting, frost formation and melt water retention pattern on microgrooved surfaces / Rahman, M. A. in Journal of heat transfer, Vol. 134 N° 8 (special issue) (Août 2012) 

Public ISBD [article]  in Journal of heat transfer > Vol. 134 N° 8 (special issue) (Août 2012) . - 01 p. Titre : Wetting, frost formation and melt water retention pattern on microgrooved surfaces Type de document : texte imprimé Auteurs : Rahman, M. A., Auteur ; A. M. Jacobi, Auteur Année de publication : 2012 Article en page(s) : 01 p. Note générale : heat transfer Langues : Anglais (eng) Note de contenu : Photogallery DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000008 [...] [article] Wetting, frost formation and melt water retention pattern on microgrooved surfaces [texte imprimé] / Rahman, M. A., Auteur ; A. M. Jacobi, Auteur . - 2012 . - 01 p. heat transfer Langues : Anglais (eng) in Journal of heat transfer > Vol. 134 N° 8 (special issue) (Août 2012) . - 01 p. Note de contenu : Photogallery DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000008 [...]