Σχεδιασμός εύρωστου ελεγτή για υβριδική ναυτική εγκατάσταση πρόωσης

Μπάρδης, Κωνσταντίνος; Bardis, Konstantinos

dc.contributor.author	Μπάρδης, Κωνσταντίνος	el
dc.contributor.author	Bardis, Konstantinos	en
dc.date.accessioned	2016-06-24T13:59:52Z
dc.date.available	2016-06-24T13:59:52Z
dc.date.issued	2016-06-24
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/42846
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.8404
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Robust control	en
dc.subject	Diesel engines	en
dc.subject	Emission control	en
dc.subject	Virtual sensor	en
dc.subject	Hybrid powertrains	en
dc.subject	Εύρωστος έλεγχος	el
dc.subject	Υβριδικά συστήματα	el
dc.subject	Εικονικός αισθητήρας	el
dc.subject	Έλεγχος ρύπων	el
dc.subject	Μηχανές Ντίζελ	el
dc.title	Σχεδιασμός εύρωστου ελεγτή για υβριδική ναυτική εγκατάσταση πρόωσης	el
dc.title	Robust controller design for a hybrid-electric marine propulsion plant	en
heal.type	bachelorThesis
heal.classification	Control engineering	en
heal.classificationURI	http://skos.um.es/unesco6/331102
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2015-12-05
heal.abstract	The main purpose of this thesis is the design of a robust controller for a hybrid-electric marine propulsion plant in order to reduce the main pollutant emissions of the internal combustion engine (ICE) during load transients. Precisely, the controlled physical variable is the value of lambda-λ of the exhaust gas produced by the ICE and the system’s input is the command that is fed to the frequency inverter of the electric motor (EM) which manipulates the torque output of the EM. The type of robust controller chosen for the implementation was the µ-controller, mainly for its convenience in the modelling of uncertainty elements. The soundness of the modelling and of the developed controllers is evaluated in the experimental facilities of the Laboratory of Marine Engineering (LME). Initially, a virtual λ-sensor was developed as an eﬀective way to replace the measurements from the physical sensor installed in the exhaust duct of the ICE. The virtual sensor was tested on-line and the estimated values of λ were compared to the measured values of the physical sensor under both steady state and transient operation of the ICE. It should be noted that a phenomenological approach was adopted in the model derivation of the virtual sensor. Furthermore, the non-linear dynamic uncertain model was derived using a mean value approach in order to simulate the value of λ during transient engine operation. The fundamental objective was to obtain a model of λ depending only on known physical variables of the hybrid-electric power-train. The model developed has to suﬃciently capture the transient phenomena but, simultaneously, be as simple as possible in order to be suitable for the control application. For this reason, various simpliﬁcations were made and their validity were evaluated mostly from an engineering perspective. A linear model was obtained, for control purposes, from the original non-linear uncertain plant at a certain operating point of the engine. For this reason, all the physical variables of the operating point, which are at steady state, were computed as a function of the known input variables; namely, the requested torque and the rotational speed of the engine. The non-linear algebraic constraint equations along with certain diﬀerential equations were also useful in deriving a second virtual sensor model which made use only of the turbocharger speed in order to estimate λ; thus, provides a promising and low cost solution for practical marine applications. Furthermore, a low order λ-model of the internal combustion was obtained through singular perturbations order reduction technique. The model was linearised and, eventually, a ﬁrst order transfer function connecting the fuel mass ﬂow with the variations in the value of lambda was derived. The transfer function was parametrized and the parameters of it were presented in 2D maps as a function of the steady state fuel mass ﬂow and the engine’s rotational speed. In this way, insights were gained for the performance of the internal combustion engine in various operating points. 6 Additionally, the model of the disturbance transfer function and the plant transfer function were derived from the non-linear uncertain model. Both these models have as output the value of λ with the input of the former being the disturbance torque and the input of the latter being the frequency inverter command. The linear models were imported to the µ-synthesis algorithm in order to obtain the robust controller. The controller was analysed in terms of performance and stability in the presence of uncertainty in modelling. Finally, the experimental validation of the controller performance was carried out at the experimental testbed of LME. The controllers functioned satisfactory and the results obtained from simulations closely matched those of the experiments.	en
heal.advisorName	Παπαλάμπρου, Γεώργιος	el
heal.committeeMemberName	Παπαλάμπρου, Γεώργιος	el
heal.committeeMemberName	Κυρτάτος, Νικόλαος	el
heal.committeeMemberName	Κυριακόπουλος, Κωνσταντίνος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής Μηχανολογίας. Εργαστήριο Ναυτικής Μηχανολογίας	el
heal.academicPublisherID	ntua
heal.numberOfPages	120 σ.	el
heal.fullTextAvailability	true