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dc.contributor.authorJi, Guomin
dc.contributor.authorOng, Muk Chen
dc.date.accessioned2020-01-10T10:20:39Z
dc.date.available2020-01-10T10:20:39Z
dc.date.created2019-09-24T18:37:36Z
dc.date.issued2019
dc.identifier.issn1996-1073
dc.identifier.urihttp://hdl.handle.net/11250/2635646
dc.description.abstractWith the increase in offshore wind farms, the demands for umbilicals and power cables have increased. The on-bottom stability of umbilicals and power cables under the combined wave and current loading is the most challenging design issue, due to their light weight and the complex fluid–cable–soil interaction. In the present study, the methodology for dynamic lateral stability analysis is first discussed; and the reliable hydrodynamic load model and cable–soil interaction model based on large experimental test data are described in detail. The requirement of the submerged weight of a cable w s ws to obtain on-bottom stability is investigated for three types of soil (clay, sand and rock), using the finite element program PONDUS, and the results are w s,rock >w s,clay >w s,sand ws,rock>ws,clay>ws,sand under the same load conditions. Several different aspects related to optimization design of the on-bottom stability are explored and addressed. There is a significant benefit for the on-bottom stability analysis to consider the reduction factors, due to penetration for clay and sand soil. The on-bottom stability is very sensitive to the relative initial embedment z 0 /D z0/D for clay and sand soil, due to the small diameter of the cables, and therefore, reliable prediction of initial embedment is required. In the energy-based cable–soil interaction model, the friction coefficient μ μ and the development of penetration affect each other and the total effect of friction force F f Ff and passive resistance F r Fr is complicated. The effect of the friction coefficient μ μ on the on-bottom stability is different from engineering judgement based on the Coulomb friction model. The undrained shear strength of clay is an important parameter for the on-bottom stability of umbilicals and cables. The higher the undrained shear strength of the clay, the larger the lateral displacement. Meanwhile, the submerged weight of sand has a minor effect on the lateral displacement of cables. The method used in the present study significantly improves the reliability of the on-bottom stability analysis of umbilicals and power cables for offshore wind application
dc.language.isoengnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleOn-Bottom Stability of Umbilicals and Power Cables for Offshore Wind Applicationsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersion
dc.source.volume12nb_NO
dc.source.journalEnergiesnb_NO
dc.source.issue19nb_NO
dc.identifier.doi10.3390/en12193635
dc.identifier.cristin1728556
cristin.unitcode224,50,0,0
cristin.unitnameAvdeling for ingeniørfag
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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