Systematic survey of common defects/failures in rotary cranes and introduction of vibration data driven diagnostic analysis an explanatory case to develop preventive measures for complex structural mechanical system

Katsouris, Chrysovalantis; Κατσούρης, Χρυσοβαλάντης

dc.contributor.author	Katsouris, Chrysovalantis	en
dc.contributor.author	Κατσούρης, Χρυσοβαλάντης	el
dc.date.accessioned	2023-03-06T09:14:28Z
dc.date.available	2023-03-06T09:14:28Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/57203
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.24901
dc.description	Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Ναυτική και Θαλάσσια Τεχνολογία και Επιστήμη”
dc.rights	Default License
dc.subject	Ship's rotary crane	en
dc.subject	Slewing bearing	en
dc.subject	Axial gears	en
dc.subject	Complex system	en
dc.subject	Survey intervals	en
dc.title	Systematic survey of common defects/failures in rotary cranes and introduction of vibration data driven diagnostic analysis an explanatory case to develop preventive measures for complex structural mechanical system	en
heal.type	masterThesis
heal.classification	Mechanical system with axial gears	en
heal.language	en
heal.access	campus
heal.recordProvider	ntua	el
heal.publicationDate	2023-01-13
heal.abstract	This thesis attempts to bring up blanks of an outdated survey method used for rotary cranes fitted on board vessels known as Deck cranes. Survey method in force include visual examination – operational tests and overload test respectfully at annually and 5yearly intervals by third parties (Classification Societies). Around 80% of the volume of international trade in goods is carried by ships , vessels provided with deck cranes are more competitive in the maritime industry with higher daily fares. Purpose of cranes provided on ships is lifting of heavy loads and moving them from one place to another, an activity of critical importance, enable ships self-loading and self-unloading to shore facilities. Numerous of catastrophic incidents noted to vessels deck cranes, where in many cases lead to fatal consequences. Ship cranes are structures subjected to large loads that generate stresses in the slewing devices and slewing foundation. The effects and implications of variable loads are often not completely understood or valued by builders and operators, so in various cases collapse of crane tower due to generated loads at slewing devices leads to fatal accidents, delays in supply chain and financial losses to ship-management company. Classification Societies and Flag administrations establish rules and regulation respectively, enable surveyors or third-party inspectors to identify potential failures, defects and abnormalities, therefore, a minimum scheme had been adopted includes Annual inspections and five yearly inspections (including overload tests) of Rotary cranes on ships. After analysis of crane components, understanding of rotary crane’s operation, maintenance scheme adopted by ship management company and survey procedures, with this thesis we intent to underline necessity and importance to propose advanced scope of surveys, basis on vibration, radiating noise produced by the complex structures. Notwithstanding the complexity of cranes structure and their parts, after evaluating incidents occurred so far, field experiment performed on board vessel, eight accelerometers placed peripheral of slewing bearing (critical point) allow us to analyze dynamic complex mechanical system basis on frequencies produced, while system runs. The real data collected during field experiment on a 3-years old bulk carrier vessel under the auspices of the research program IMS-PB DIAGNOSIS (Funded by European Union & Hellenic General Secretariat of Research & Technology (ARISTEIA II: Excellence in Research, 2014-2019). Elementary analysis with Fast Fourier Transform method was performed to figure out existence of high frequencies and resonances. Crane operators are not in position to evaluate - analyze condition and efficiency of complex structural mechanical system or to identify potential failures during crane’s operation, thus, development of real time monitoring system and improvement of survey method of cargo ships deck cranes is considered necessary. Our proposal's monitoring system may be fitted on every rotary crane on every vessel, is an effective solution to prevent failures, defects and fatal consequences. Such monitoring system is able to record and acquire real times signals by means of sensors such as accelerators. A simplified method may analyze vibration level and noise produced during rotary crane's operation by loads lifted and rotated. Real time data may be decoded providing safe or precautionary awareness could be provided to the operator in charge considered a safety measure against catastrophic failures, therefore we see development of monitoring system as an asset in both survey scope and safe ship's cargo handling.	en
heal.advisorName	Georgiou, Ioannis	en
heal.committeeMemberName	Spyrou, Konstantinos	en
heal.committeeMemberName	Antoniadis, Ioannis	en
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών	el
heal.academicPublisherID	ntua
heal.fullTextAvailability	false