Σύστημα Βέλτιστου Ελέγχου Ναυτικών Κινητήρων Diesel σε Ακραία Μεταβατική Λειτουργία: Εφαρμογή στη Μείωση Εκπομπών Καπνού Μέσω Υποβοηθητικής Παροχής Πεπιεσμένου Αέρα, Αποφεύγοντας Πάλμωση Υπερπληρωτή

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dc.contributor.advisor Κυρτάτος, Νικόλαος el
dc.contributor.author Παπαλάμπρου, Γεώργιος Η. el
dc.contributor.author Papalambrou, George Ι. en
dc.date.accessioned 2010-02-22T14:25:43Z
dc.date.available 2010-02-22T14:25:43Z
dc.date.copyright 2009-02-02
dc.date.issued 2010-02-22T14:25:43Z
dc.date.submitted 2009-02-02
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/3194
dc.identifier.uri http://dx.doi.org/10.26240/heal.ntua.87
dc.description 140 σ. el
dc.description.abstract Η μείωση των εκπομπών καπνού και η βελτίωση απόκρισης φορτίου σε ένα ναυτικό υπερτροφοδοτούμενο κινητήρα Diesel, σε μεταβατική λειτουργία που περιλαμβάνει απότομες αυξήσεις στο φορτίο, αποτέλεσαν το αντικείμενο αυτής της εργασίας. Χρησι οποιήθηκε σύστημα ελέγχου με μοντέλο πρόβλεψης (Model Predictive Control-MPC), σε ένα σύστημα εξωτερικής παροχής παροχής πεπιεσμένου αέρα απευθείας στο δοχείο αέρα. Ταυτόχρονα, στόχος ήταν η αποφυγή πάλμωσης του συμπιεστή του υπερπληρωτή, ανάντι του δοχείου αέρα. en
dc.description.abstract The reduction of smoke emissions and improvement of load acceptance in a turbocharged marine diesel engine, during transient operation involving rapid load increases, were considered in the present work. Model predictive control (MPC) was used in a system for external compressed air injection directly in the air manifold. Concurrently, the aim was to avoid surge in the turbocharger compressor upstream of the air manifold. Previous work in the Laboratory of Marine Engineering/NTUA had proved experimentally the applicability of the air injection method for smoke reduction and had also investigated the compressor surge behavior via en- gine performance simulations. Compressor system surge is a self-excited limit cycle oscillation, charac- terized by large amplitude pressure rise and mass flow fluctuations. It starts to occur when the pressure rise and mass flow characteristics for constant speed exceed certain values determined by characteristics of the compressor and load. A surge avoidance method was used , where stable operation was achieved by operating the compressor at a safe distance, defined as surge margin, from the unstable region. In MPC, a dynamical model of the process is used to construct and solve an optimization problem aiming to achieve prescribed performance, under constraints on input/output variables. MPC is widely accepted in the process industry and recently has been considered for the control in combustion engines, despite the high computational overhead. Due to the difficulty of deriving a process model from first principles for the smoke density (opacity), system identification was used in order to derive control models relating air injection and fuel to opacity and intake manifold pressure. Air injection was considered as manipulated variable, and opacity as controlled variable. The fuel was considered as measured disturbance. Intake manifold pressure was related to compressor instability. In the MPC, the ob jective function was the minimization of smoke density (opacity), with constraint not to exceed a limit in intake manifold pressure. Experiments at the Laboratory were performed on a full scale marine diesel engine, with two different types of predictive controllers. Results comparing the opacity under air injection model predictive control with the standard engine operation, i.e. without air injection, during the same transient were presented. It can be seen that with air injection, opacity was reduced considerably. The peak value remained the same in both cases, about 80%. However, in the case with air injection, this peak dropped considerably after about 0.5 sec to a steady value of about 40%, until the end of disturbance. The significant reduction obtained in the full scale testbed experiments demonstrated the effectiveness of the proposed system of controlled air injec- tion for smoke abatement during engine transients, as well as the suitability of the control method used. en
dc.description.statementofresponsibility Γεώργιος Η. Παπαλάμπρου en
dc.format.extent 175 bytes
dc.format.extent 22489313 bytes
dc.format.mimetype text/xml
dc.format.mimetype application/pdf
dc.language.iso en en
dc.rights ETDFree-policy.xml en
dc.subject Κινητήρες πετρελαίου el
dc.subject Συστήματα ελέγχου el
dc.subject Μοντέλο πρόβλεψης el
dc.subject Αναγνώριση συστημάτων el
dc.subject Πάλμωση el
dc.subject Diesel engine control en
dc.subject Opacity en
dc.subject Model predictive control en
dc.subject Identification en
dc.subject Surge en
dc.title Σύστημα Βέλτιστου Ελέγχου Ναυτικών Κινητήρων Diesel σε Ακραία Μεταβατική Λειτουργία: Εφαρμογή στη Μείωση Εκπομπών Καπνού Μέσω Υποβοηθητικής Παροχής Πεπιεσμένου Αέρα, Αποφεύγοντας Πάλμωση Υπερπληρωτή el
dc.title.alternative Optimal Control of Marine Propulsion Diesel Engine During Transient Loading Operation: Application for Smoke Opacity Reduction through Manifold Air Injection Avoiding Compressor Surge en
dc.type doctoralThesis el (en)
dc.date.accepted 2008-09-29
dc.date.modified 2009-02-02
dc.contributor.advisorcommitteemember Φραγκόπουλος, Χρίστος el
dc.contributor.advisorcommitteemember Κυριακόπουλος, Κωνσταντίνος el
dc.contributor.advisorcommitteemember Κρικέλης, Νικόλαος el
dc.contributor.advisorcommitteemember Καϊκτσής, Λάμπρος el
dc.contributor.advisorcommitteemember Γούλας, Α. el
dc.contributor.advisorcommitteemember Σταματέλος, Α. el
dc.contributor.committeemember Κυρτάτος, Νικόλαος el
dc.contributor.committeemember Φραγκόπουλος, Χρίστος el
dc.contributor.committeemember Κυριακόπουλος, Κωνσταντίνος el
dc.contributor.committeemember Κρικέλης, Νικόλαος el
dc.contributor.committeemember Καϊκτσής, Λάμπρος el
dc.contributor.committeemember Γούλας, Α. el
dc.contributor.committeemember Σταματέλος, Α. el
dc.contributor.department Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής Μηχανολογίας el
dc.date.recordmanipulation.recordcreated 2010-02-22
dc.date.recordmanipulation.recordmodified 2010-02-22

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