Trans RINA, Vol 157, Part C1, Intl J Marine Design, Jan –Dec 2015 Considering the overall O&M strategy; in most
simulations, a Condition Based Maintenance (CBM) strategy proved to be superior over failure based (wiith and without pr
reventive maintenance). This was broadly
expected as, despite higher direct O&M costs, CBM significantly decreases downtime and therefore increases annual electricity production.
In regard to the marine support strategy it was identified that a mothership / daughter vessel combination presents a
preferable solution as it significantly increases
flexibility (over a system based purely on large CTVs) and efficiency. The use of a small CTV again highlights the importance of the operability threshold for safe pe
ersonnel transfer from the vessel to the turbine. As noted earlier, the operability threshold could be raised to a maximum of 2.5m SWH by using a pe
ersonnel transfer
device. This would significantly improve accessibiliitty, decreasing downtime and therefore increasing overall electricity production rate.
Section 5 describes
development of an illustrative design for such a CTV. 4.
AN EXAMPLE TURBINE ACCESS VESSEL DESIGN
4.1 THE DESIGN BUILDING BLOCK APPROACH
The UCL Design Research Centre (DRC), part of the MRG, has expounded and developed a configurationally- ach to preliminary ship design, which xible configurational model of
centred approa adopts a flex
ensure technical the ship
combined with naval architectural numerical analy sis tools to
balance, while enabli
innovative exploration during the formative desi evolution. This is designated the Design Building Block approach [13]. The DRC instigated an alliance wiith Graphics Research Corporation Limited (GRC) (now pa
ing ign
art of Qinetiq) ) to incorporate the Design Building Block
approach as the SURFCON facility in GRC’s Paramarine Preliminary Ship Design System [14].
Paramarine is an object-bas ed naval architectural design ackage utilising the commercial ParaSolid modeller as its core [15]. A screenshot of the system in use is shown in Figure 5. This shows the interactive graphical display of the design configuration (the “graphical pane” on the right, with a hierarchical navigation pane on the left and examples of numerical data and analysis (a resistance estimate).
pa
P aramarine-SURFCON is not just a graphical tool, it also contains objects for the assessment of the pe
erformance of capabilities,
ba pe
alanced and erformance. resistance and layout
f the design across a range of ship design including
stability, manoeuvring and radar cross section signature in order that each design study is both numericallly achieves the desired
propulsion, es,
levels of ship The interactive graphical interface enhances the use of these numerical analysis tools by
Figure 5: Screenshot of PARAMARINE showing interactive numerical, tabular and graphical information in the Design Building Block objects
The Design Building Block approach to early stage ship design seeks to encourage a more holistic approach to the development of the ship design solution. Ins tead of a set of numerical steps or a mechanis
stic approach, where each
aspect of the performance of the design is examined separately and in turn, the integrated nature of the SURFCON implementation in PARMARINE allows aspects of the design’s effectiveness to be assessed from the earliest stages of design. A further aspect of the DBBA is the use of a Functional Hierarchy to describe the ship. This features four main Functional Groups; FLOAT, MOVE, SERVICE and INFRAST RUCTURE. Individual Design Building Blocks have a position within this
hierarchy and a classification under a more
traditional weight group system for cost estimation. The Design Building Block approach has been applied in
a range of design studies inclnc uding motherships for unmanned air [16], underwater [17] and surface vehicles [18], both monohull and multihull vessels and studies on the producability of merchant vessels [19].
4.2 OVERVIEW OF THE DESIGN UCL developed an illustrative Wind Farm Support
Vessel, both to demonstrate the application o f the Design Building Block approach to the design of small craft, and to provide a baseline for futu integrated O&M and ship de
ure development of the esign method described
above. This design was develloped to meet the broad requirements for the small CTV identified in the analysis described in Section 3. As an illustrative design, the
C-140 © 2015: The Royal Instittu ution of Naval Architects the
placing the results in the context of the current ship configuration – for example, the results of a stability curve (GZ) calculation can be visualised
to directly
investigate the effect of geometric shape on the GZ curve, a particularly important issue for certain multi- hulled vessels.
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