Feature 3 | CAD/CAM UPDATE
another curve (beads). Once the boundaries are defined the user is free to add further detail by inserting curves where more definition is required. In Figure 1 the flat of keel curve and the flat of side curve can be seen. Te user is allowed maximum flexibility by inserting as many curves as necessary to define all the major features of the hull required. Paramarine’s native parametric capability
then further enhances the tool allowing the designer to connect the definition of curves to parameters in the design. Once the definition is complete, the user can easily modify the features of the hull simply by typing new values for the parameters, and allowing the curves and surfaces to regenerate. Te flexibility of the system allows complex
shapes to be represented and linked to the naval architecture analysis tools available very quickly. In Figure 2 the reproduction of the Earthrace hull is shown, together with the curves used to define it. It can be seen that, although the Earthrace hull is very advanced in its features, a small number of curves are able to represent its shape accurately and produce a faithful solid model.
Figure 2: Earthrace, complete solid hull. Tools have also been added for ease of use
and speed, such as controllable grids in three axes for snapping, the ability to lock curves and points together in the graphics pane, and the ability to import images as background reference data from which curves can be generated. Te power of the tool and the methods behind it are said to be clear, because a complex
hull can be created in a matter of hours or days (clearly depending on complexity) with a high degree of accuracy. Creating a full parametric model takes a little longer but gives the ability to try different propulsion options, different hullform parameters, assess the effect on structure, sea-keeping etc with an easily variable geometry but one that maintains its accuracy and
controllability.NA
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44
The Naval Architect April 2008
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