Extreme bending moments on long catenary risers due to heave excitation

Chatjigeorgiou, IK; Passano, E; Larsen, CM

dc.contributor.author	Chatjigeorgiou, IK	en
dc.contributor.author	Passano, E	en
dc.contributor.author	Larsen, CM	en
dc.date.accessioned	2014-03-01T02:51:05Z
dc.date.available	2014-03-01T02:51:05Z
dc.date.issued	2007	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35359
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-37249027674&partnerID=40&md5=0399a76b5bebae5f73f443272a6a1f67	en
dc.subject.other	Approximation theory	en
dc.subject.other	Bending moments	en
dc.subject.other	Dynamic response	en
dc.subject.other	Electric excitation	en
dc.subject.other	Problem solving	en
dc.subject.other	Time domain analysis	en
dc.subject.other	Heave excitation	en
dc.subject.other	Static counterpart	en
dc.subject.other	Touch down region	en
dc.subject.other	Marine risers	en
dc.title	Extreme bending moments on long catenary risers due to heave excitation	en
heal.type	conferenceItem	en
heal.publicationDate	2007	en
heal.abstract	This paper deals with the dynamic behaviour of catenary shaped risers under imposed motions applied at the top. Particular attention is paid to the heave component of motion which is of substantial importance for practical applications as it results to the amplification of large bending moments in the touch down region. In fact, the bending moment obtains its maximum value at the vicinity of the touch down point and very close to the location of its maximum static counterpart. This singular behaviour is discussed using the results from the solution of the eigenvalue problem. To this end the eigenfrequencies and the corresponding mode shapes are calculated using the WKB approximation making no assumption regarding the variation of the static components. In addition, the feature of the correlation between the axial component of the velocity of the excitation and the extreme bending moments at the lower part (Passano and Larsen, 2006) is further investigated through comparative numerical calculations of the problem using both frequency and time domain techniques. Copyright © 2007 by ASME.	en
heal.journalName	Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE	en
dc.identifier.volume	1	en
dc.identifier.spage	449	en
dc.identifier.epage	459	en