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dc.contributor.authorUlveseter, Jan Vidar
dc.contributor.authorSævik, Svein
dc.contributor.authorLarsen, Carl Martin
dc.date.accessioned2017-11-28T10:16:42Z
dc.date.available2017-11-28T10:16:42Z
dc.date.created2016-12-15T16:25:53Z
dc.date.issued2016
dc.identifier.isbn978-0-7918-4992-7
dc.identifier.urihttp://hdl.handle.net/11250/2468221
dc.description.abstractA promising time domain model for calculation of cross-flow vortex induced vibrations (VIV) is under development at the Norwegian University of Science and Technology. Time domain, as oppose to frequency domain, makes it possible to include non-linearities in the structural model. Pipelines that rest on an irregular seabed will experience free spans. In these areas VIV is a concern with respect to the fatigue life. In this paper, a time domain model for calculation of VIV on free spanning pipelines is proposed. The model has non-linear interaction properties consisting of discrete soil dampers and soil springs turning on or off depending on the pipeline response. The non-linear model is compared to two linear models with linear stiffness and damping properties. One linear model is based on the promising time domain VIV model, while the other one is based on RIFLEX and VIVANA, which calculates VIV in frequency domain. Through four case studies the effect of seabed geometry, current velocity and varying soil damping and soil stiffness is investigated for a specific pipeline. The results show that there is good agreement between the results produced by VIVANA and the linear model. The non-linear model predicts smaller stresses at the pipe shoulders, which is positive for the life time estimations. Soil damping does not influence the response significantly.nb_NO
dc.language.isoengnb_NO
dc.publisherAmerican Society of Mechanical Engineers (ASME)nb_NO
dc.relation.ispartofASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering Volume 1: Offshore Technology; Offshore Geotechnics
dc.titleVortex Induced Vibrations of Pipelines With Non-Linear Seabed Contact Propertiesnb_NO
dc.typeChapternb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.identifier.doi10.1115/OMAE2016-54424
dc.identifier.cristin1413652
dc.description.localcodeThis chapter will not be available due to copyright restrictions (c) 2016 by ASMEnb_NO
cristin.unitcode194,64,20,0
cristin.unitnameInstitutt for marin teknikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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