Δυναμική τοποθέτηση ενδιάμεσου εδράνου για βέλτιστη αξονική ευθυγράμμιση υπό την επίδραση μεταβλητών υδροδυναμικών φορτίων της έλικας

Ιωαννίδης, Ιωάννης; Ioannidis, Ioannis

dc.contributor.author	Ιωαννίδης, Ιωάννης	el
dc.contributor.author	Ioannidis, Ioannis	en
dc.date.accessioned	2025-01-22T09:10:13Z
dc.date.available	2025-01-22T09:10:13Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/60905
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.28601
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	Shaft alignment	en
dc.subject	Bearing actuation concept	en
dc.subject	Intermediate shaft bearing	en
dc.subject	Propeller hydrodynamic loads	en
dc.subject	Ευθυγράμμιση άξονα	el
dc.subject	Υδροδυναμικά φορτία έλικας	el
dc.subject	Ενδιάμεσο έδρανο	el
dc.title	Δυναμική τοποθέτηση ενδιάμεσου εδράνου για βέλτιστη αξονική ευθυγράμμιση υπό την επίδραση μεταβλητών υδροδυναμικών φορτίων της έλικας	el
dc.title	Dynamic intermediate bearing positioning for optimal shaft alignment under varying propeller hydrodynamic loads	en
heal.type	bachelorThesis
heal.classification	shaft alignment optimization	en
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2024-06-21
heal.abstract	As every mechanical system onboard a vessel, the shafting system has to be studied, optimized and verified according to existing rules. Shaft alignment is a process which at most cases referrers to static conditions of the vessel, as per pertinent rules of classification societies. However, given that ship designs have changed over the last years, there are reported cases of vessels which, even though they meet current shaft alignment related requirements, may face unfavorable conditions, causing unacceptable load distribution on the bearings during their lifecycle. This is especially noticeable at shaft alignment sensitive ships (i.e. those with a single stern tube bearing), emphasizing the importance of considering also running conditions except from static conditions for a more comprehensive alignment evaluation. Recent literature emphasizes the substantial impact of propeller hydrodynamic forces on the shafting system, highlighting the necessity of their inclusion in elastic shaft alignment calculation, as is one of the major sources affecting shaft-bearing loading. For this reason, the primary goals of this thesis are to study the range of propeller hydrodynamic loads for a number of operational cases (straight ahead course at designed and ballast drafts, maneuvering) and evaluate the impact of extreme hull deflections due each loading condition and to determine how the shafting system responds to those loads. Furthermore, a motion control (actuation) mechanism is determined and examined for the intermediate shaft bearing for a case study ship, with focus on optimizing its position through specific adjustments, in order to completely eliminate bearing over or unloading and establish safe shafting system conditions, acceptable by IACS class rules. Moreover, hull deflections will be calculated through a simplified 1D calculation method. The concept of intermediate shaft bearing actuation is originated from the proposed future-works deriving from the i-MARINE project.	en
heal.advisorName	Παπαδόπουλος, Χρήστος	el
heal.committeeMemberName	Δημόπουλος, Γεώργιος	el
heal.committeeMemberName	Παπαλάμπρου, Γεώργιος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής Μηχανολογίας. Εργαστήριο Ναυτικής Μηχανολογίας	el
heal.academicPublisherID	ntua
heal.numberOfPages	111 σ.	el
heal.fullTextAvailability	false