Page 54: of Maritime Reporter Magazine (October 1998)

Software Solutions: CAD/CAM/CAE mined that a high level of con- struction accuracy was possible without a dramatic increase in costs.

The development of some stan- dard primary and secondary struc- tures minimized design time and increased producibility and also significantly affected another important area, the CAD model.

By having the primary structure identical for all units, the structur- al CAD modeler was able to rapid- ly create all of the structural mod- els.

Also after review of the equip- ment arrangements for several of the units the structural engineer- ing sub-team was able to recom- mend 3 basic arrangements for the secondary structure.

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The design of the machinery units can proceed independent of the ship's structure and somewhat independent of the other machin- ery units.

The space below the secondary structure was utilized for piping.

The walkway secondary structure provided the support for the cable- ways and through unit piping.

The electrical cabling is simply laid in the trays and when the run- ning of all cables is complete the walkway plates are secured in place over the cables. The units were designed to enable the mechanic to install the majority of the equipment and piping on the secondary structure (forming a

Level 2 unit) on their workbench.

The Level 2 unit is then installed onto the Level 4 primary structure and the remaining interconnecting and through piping is installed on the Level 4 machinery unit and the unit is tested. As the majority of connections to the primary and secondary structure are mechani- cal, final painting can occur prior to Level 2 and Level 4 outfitting.

Once the level units are outfit- ted and tested, they are assembled as a grand unit and all wiring and testing that is practical is complet- ed. Since the control and monitor- ing and power distribution sys- tems are based on the distributive concept much of the local wiring is installed and tested at the inde- pendent Level 4 machinery units.

Once the grand unit is assembled the majority of testing can be com- pleted.

On SSD#3 the build strategy plan was to install the main engine, shafting, and generators during a one week period once the engine compartment was complet- ed and then loadout the Level 4 units in three lifts.

The interconnecting piping is disconnected and the electrical and control cabling is coiled back to the most convenient unit.

The forward lift is an athwartship configuration consist- ing of units 56C101, 56C201, 56P101, 56P201, 61C101, 61C201, 61P101, 61P201, and 61C001.

As the distributive electrical and control and monitoring sys- tems are designed with this con- struction step considered, the amount of such cabling is minimal.

The yellow cabinets are the three primary power supply centers for the forward ten units.

Hence there are only three 03824

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FlagShip from Proteus Engineering

FlagShip is a complete ship design system, including hullform design (FastSbip), structural design and opti- mization (MAESTRO), stabili- ty, powering, maneuvering, seakeeping, ship- yard cost estimating and interfaces to CAD and ship production programs. FlagShip is based on Ume-tested, best-in-class applications, which are in use by more than 1,000 designers in over 30 countries around the world.

General Hydrostatics (GHS) from Creative Systems, Inc.

Widely recognized as the most advanced and produc- tive trim/stability/strength software. Specialized ver- sions are available for ship operators, for salvage engineers and for small craft designers. Includes efficient modeling for all types of complex vessels, and the abili- ty to analyze them both afloat and aground.

NavCad from HydroComp, Inc.

NavCad offers an integrated platform to predict resistance and power, and to determine optimum propeller parame- ters. With NavCad each aspect of a ship's performance can be evalu- ated for virtually every type of displacement hull, semi-displacement and planing craft, river barge train, catamaran and auxiliary- powered sailboat.

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NC-Pyros97 from Albacore Research Ltd.

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