Surfaces to define
the hull form
uses surfaces for defining vessel forms. It allows the definition of the
vessel in a continuous three-dimensional way which has many advantages:
The user governs the form of the surface moving its "control points". The system supports multiple surfaces (patches) connected between them for defining the forms as a whole. The connections between patches can be from several continuity rates.The system manages internally the modifications produced in one patch that can have an effect on the other ones. During the hull design process,the user can perform naval architecture calculations in an interactive way with the purpose of checking the effect that the modifications in the forms have over the vessel main parameters: displacement, centre of buoyancy, coefficients, curve of areas, etc.
design of the hull form by moving the control points of the surfaces.
At any time ,
the user can see
diagram to make
easy the checking
of the forms.
The hull form
definition can be done in three ways
In this case, the user has already the forms from a pre-existing vessel and he wants to "input" them into DEFCAR system, making one "identification". This procedure is frecuently used in the practice by the shipyards. Firstly, the user must input some reference points of the forms. DFform, helped by the user, will adjust the surfaces to the reference points. The precision of the identification can be of the order of 1 mm, depending on the quality of the pre-existing forms.
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