Show simple item record

dc.contributor.authorSolaas, Frøydis
dc.contributor.authorSandvik, Peter Christian
dc.contributor.authorPakozdi, Csaba
dc.contributor.authorKendon, Timothy Edward
dc.contributor.authorLarsen, kjell
dc.contributor.authorMyhre, Erling
dc.identifier.citationASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering - Volume 9: Offshore Geotechnics; Torgeir Moan Honoring Symposiumnb_NO
dc.description.abstractThis paper describes a study aimed at finding and demonstrating a feasible method to reduce the uncertainties in calculation of dynamic forces and limiting sea states for installation of protection covers produced from glass fiber reinforced polyester (GRP). Uncertainties arise in the choice of hydrodynamic coefficients and the applied analysis method e.g. the Simplified Method, as suggested in DNV-OS-H206, versus time-domain simulations. The maximum limiting sea state for water entry and lowering through the splash zone has been assessed stepwise by use of alternative methods. Firstly, the hydrodynamic force coefficients for a fully submerged, selected GRP cover were estimated manually, by use of simplified data in DNVGL-“Recommended practice for modelling and analysis of marine operations”, DNVGL-RP-H103. The estimated hydrodynamic added mass was compared with the potential theory solution obtained by use of WAMIT. WAMIT calculations are also performed to obtain added mass and potential damping for the cover with different draughts at the selected installation angle. Viscous damping and added mass will be dependent on amplitude of oscillation and is studied by CFD simulations. A fully submerged cover is oscillated harmonically with different amplitudes at a selected period. The obtained added mass and damping coefficients were used in a numerical model including installation ship, lifting gear and GRP cover, in the non-linear time domain simulation program SIMO. The lowering through the splash zone were finally performed in some selected wave conditions to illustrate how a realistic limiting sea-state for the lowering through the splash zone may be estimated.nb_NO
dc.publisherASME Digital collectionnb_NO
dc.relation.ispartofASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering - Volume 9: Offshore Geotechnics; Torgeir Moan Honoring Symposium
dc.relation.ispartofseriesASME Proceedings | Torgeir Moan Honoring Symposium;OMAE2017-62499
dc.rightsNavngivelse-Ikkekommersiell-DelPåSammeVilkår 4.0 Internasjonal*
dc.titleDynamic Forces and Limiting Sea States for Installation of GRP Protection Coversnb_NO
dc.rights.holderThe authorsnb_NO
dc.relation.projectNorges forskningsråd: 237929nb_NO
cristin.unitnameOcean Engineering

Files in this item


This item appears in the following Collection(s)

Show simple item record

Navngivelse-Ikkekommersiell-DelPåSammeVilkår 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse-Ikkekommersiell-DelPåSammeVilkår 4.0 Internasjonal