Feature 2 | CADCAM UPDATE Benefits seen in 3D


Deltamarin gives an overview of the way it is spearheading effective ship design with 3D product modelling.


T


he message is clear, says leading Finnish consultancy, Deltamarin: integrated 3D product modelling


in the development of new ship concepts, especially for cruiseships and ferries, offers exciting and positive benefits for naval architects, owners and operators. Tis philosophy provides a complete life cycle model for individual ships and can make huge contributions towards cost reductions. An inclusion of parametrics means that


highly accurate details result very early on in a project; thus, key decisions can be made much earlier than in the past. It is also easy to modify plans, should bulkheads or machinery positions be shiſted. By selecting a particular engine model,


for example, from a data bank, full details and dimensions are immediately available, which can be inserted into a plan to provide exact positioning. 3D modelling can then be employed should subsequent ships be ordered. In practice, these techniques can


realise striking economies: taking just one example, a cruiseship designed to the 2009 SOLAS rules can have its layout optimised to feature many less bulkheads and only 24 tanks, instead of 60 or, even up to 92, had older design practices been followed, while a parametric navigation bridge takes only six weeks to design instead of six months. Deck heights can be reduced in the lower part of a hull, the number of staircases can be cut and steelweight is less. All this also enables a finite element


structural model to be generated directly and at a very early stage in a ship project – and much earlier than one year down the production line, as was typical in the past. 3D modelling also has significant benefits in terms of generating a safety plan, evacuation, fire systems, and flood control. One of the first projects to employ the


latest versions of this technology, with which Deltamarin was heavily involved, was Celebrity Cruises’ Solstice class cruiseships ordered from Meyer Werſt in Germany, and headed by the recently delivered Celebrity


34 Celebrity Solstice: new probablistic stabilty rules were applied.


Solstice. This ship is also the first cruise design to which the new probabilitistic stability rules have been applied. Te results have made a huge difference,


yielding qualitative assessment, fewer subdivisions, simpler construction, and less complexity, not to mention much more overall knowledge very early on in the project. Deltamarin has also carried out further work on a Panamax-dimensioned cruiseship.


“A parametric navigation bridge takes only six weeks to design instead of six months”


Deltamarin reckons to have been a leader


in 3D computer modelling since the 1980s, generating its first engineering package for an entire ship, including all disciplines, in 1986 – a cruise vessel built at Wärtsilä’s Turku yard for Norwegian Cruise Line. During the


following decade, the consultancy carried out its first 3D design and coordination model (for an entire ship and all disciplines) for a helicopter carrier built at Bazan, Spain, for Tai end-users, also a 3D design and functional model for the navigation bridge of the icebreaker, Fennica. Te company went on to complete its


first pre-shipbuilding contract 3D design, coordination and planning model in 2003 for a cruiseship. Tis was followed in 2005 by the first parametric concept design models for several ship types. Tis is a far cry from the days when a typical cruise project could involve 12 different ship models and a 2D general arrangement plan! A wide range of tools is used to generate


these cutting edge designs. Depending on which aspect of a ship is involved, they include Tribon, Catia, Napa, Napa Steel, class society packages such as Nauticus, ShipRight and VeriStar, and computational fluid dynamics (CFD). Te end result is one integrated and coordinated comprehensive product data model.


Return to Port rules 3D modelling is also playing a major role in designing and equipping ships to meet


The Naval Architect April 2009


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