EYE ON DESIGNNew Conept Under Test Arctic DrillshipBY SOLANGE VAN DERWERFFhen Ulstein Sea of So- subject to a sensitivity study in order to Ice ? eld in aNySIM out situation. Based on the results of lutions (USOS) took assess the impact of particular param- With the aNySIM tool, a time domain these simulations, USOS could take an part in a concept design eters on the vessel design. Combining simulation was conducted whereby hun- informed decision about the placement Wcompetition for an arctic these design parameter sensitivities en- dreds of particles represented a managed of the turret in the drillship. (USOS ap-drillship, MARIN was asked to investi- abled MARIN to draw conclusions for (pre-broken by icebreakers) ice ? eld. A proved publication of their concept de-gate the concept variations. the optimal ship design. number of parameters were given to de- sign test.)USOS was asked to participate in a MARIN was involved in the design as- scribe the severity of the ice conditions, concept design competition for a drill- pects related to the hull. The goal of the including most importantly, the ice con-ship capable of operating in arctic con- sensitivity study was to give qualitative centration (the fraction of the total area ditions for several months a year. Special insight into the station keeping perfor- covered by ice) and the average ice ? oe The Authorrequirements are posed for the design of mance of the vessel when considering (particle) size. An algorithm based on such a vessel due to the cold climate and various concepts. Each concept used a Voronoi Tessellation was used to obtain a Solange van der Werff is project man-the probability of encountering sea ice disconnectable turret and had dynamic set of ice particles that exactly complied ager at the Trials & Monitoring depart-during operations. positioning (DP) capability, but the posi- with the speci? ed parameter values. ment of MARIN, the Maritime Research Instead of making adjustments to a tion of the turret varied between the con- All concepts were tested for their ca-Institute Netherlands. conventional drillship design, USOS cepts. Evaluation of the mooring loads, pabilities in the speci? c environmental developed a completely new concept the required thrust and the DP watch conditions, evaluating four different e: s.v.d.werff@marin.nl dedicated speci? cally to the purpose of circle revealed the best turret positions vessel orientations with respect to the w: www.marin.nlthe vessel. Each aspect of the design was for a range of environmental conditions. approaching ice ? eld and for a black-20 Maritime Reporter & Engineering News • APRIL 2014MR #4 (18-25).indd 20 MR #4 (18-25).indd 20 4/4/2014 10:31:26 AM4/4/2014 10:31:26 AM