Development of high performance aircraft bleed air temperature control system with reduced ram air usage / Lan Shang 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. 438-445 Titre : Development of high performance aircraft bleed air temperature control system with reduced ram air usage Type de document : texte imprimé Auteurs : Lan Shang, Auteur ; Guangjun Liu, Auteur ; Peter Hodal, Auteur Année de publication : 2011 Article en page(s) : pp. 438-445 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Aircraft Bleed air Optimal control Ram Temperature Index. décimale : 629.1 Résumé : Conventional aircraft engine bleed air temperature regulation system is inefficient due to unnecessary ram air usage in cooling the bleed air, which in turn causes unnecessary drag and fuel consumption. This paper proposes an aircraft bleed air temperature control system, aiming at minimizing the ram air usage to reduce drag and fuel consumption while maintaining fast temperature control response. To achieve both of the objectives, a new control system configuration is developed to control both ram air and bypass flows in such a way that the bypass bleed air flow is automatically controlled at a small level that is just sufficient to maintain fast regulation of the flow temperature at the load. Analytical equations describing the system dynamics and linearized model are derived and utilized in the overall bleed air temperature control design and analysis. PI control and optimal output feedback are investigated. Computer simulations and experiments have been conducted, and the proposed control system is shown to be effective in reducing ram air usage and maintaining fast temperature control response in the meantime. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5175286 [article] Development of high performance aircraft bleed air temperature control system with reduced ram air usage [texte imprimé] / Lan Shang, Auteur ; Guangjun Liu, Auteur ; Peter Hodal, Auteur . - 2011 . - pp. 438-445. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 438-445 Mots-clés : Aircraft Bleed air Optimal control Ram Temperature Index. décimale : 629.1 Résumé : Conventional aircraft engine bleed air temperature regulation system is inefficient due to unnecessary ram air usage in cooling the bleed air, which in turn causes unnecessary drag and fuel consumption. This paper proposes an aircraft bleed air temperature control system, aiming at minimizing the ram air usage to reduce drag and fuel consumption while maintaining fast temperature control response. To achieve both of the objectives, a new control system configuration is developed to control both ram air and bypass flows in such a way that the bypass bleed air flow is automatically controlled at a small level that is just sufficient to maintain fast regulation of the flow temperature at the load. Analytical equations describing the system dynamics and linearized model are derived and utilized in the overall bleed air temperature control design and analysis. PI control and optimal output feedback are investigated. Computer simulations and experiments have been conducted, and the proposed control system is shown to be effective in reducing ram air usage and maintaining fast temperature control response in the meantime. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5175286

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Wireless swimming microrobot: design, analysis, and experiments / Yongshun Zhang in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 131 N°1 (Janvier/Février 2009)  

Public ISBD [article]  inTransactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 131 N°1 (Janvier/Février 2009) . - 08 p. Titre : Wireless swimming microrobot: design, analysis, and experiments Type de document : texte imprimé Auteurs : Yongshun Zhang, Auteur ; Guangjun Liu, Auteur Année de publication : 2009 Article en page(s) : 08 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : resonance  force  motion  robots  magnetic fields  propulsion  engineering prototypes  actuators  design  vibration  fins  frequency  shapes  dynamic models Résumé : This paper presents a bidirectional wireless swimming microrobot that has been developed, analyzed, and experimentally tested. The robot is developed based on fin beating propulsion, using giant magnetostrictive films for head and tail fins. An innovative drive approach, using separate second order resonance frequencies of the head and tail fins to generate forward and backward thrusts, is proposed and implemented on a bidirectional swimming microrobot prototype. Dynamic model of the proposed microrobot has been derived based on theoretical analysis. Simulation and experimental results have demonstrated the feasibility of the proposed drive approach and design. The developed swimming microrobot features a low driving frequency, low power consumption, and a large range of swimming speed in both the forward and backward directions. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Wireless swimming microrobot: design, analysis, and experiments [texte imprimé] / Yongshun Zhang, Auteur ; Guangjun Liu, Auteur . - 2009 . - 08 p. dynamic systems Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 131 N°1 (Janvier/Février 2009) . - 08 p. Mots-clés : resonance  force  motion  robots  magnetic fields  propulsion  engineering prototypes  actuators  design  vibration  fins  frequency  shapes  dynamic models Résumé : This paper presents a bidirectional wireless swimming microrobot that has been developed, analyzed, and experimentally tested. The robot is developed based on fin beating propulsion, using giant magnetostrictive films for head and tail fins. An innovative drive approach, using separate second order resonance frequencies of the head and tail fins to generate forward and backward thrusts, is proposed and implemented on a bidirectional swimming microrobot prototype. Dynamic model of the proposed microrobot has been derived based on theoretical analysis. Simulation and experimental results have demonstrated the feasibility of the proposed drive approach and design. The developed swimming microrobot features a low driving frequency, low power consumption, and a large range of swimming speed in both the forward and backward directions. DEWEY : 629.8 ISSN : 0022-0434 En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]

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