Abstract
ABSTRACT Ship hull surfaces are commonly represented as parametric B-spline or NURBS 1 surfaces. The shape of a surface is controlled by a regular mesh of vertices with constant numbers of vertices in each parametric direction. This restriction complicates the modelling of complex features like bulbous bows, stern bulbs, transoms. Multiple surface patches may be used to overcome the limitations of a regular control mesh, but it is challenging to keep the patches properly aligned at the seams. This paper presents a systematic methodology to design fully featured ship hulls without any gaps, overlaps or tangent and curvature discontinuities. With proper layout of the control vertex mesh and exploitation of the geometrical properties inherent to the B-spline/NURBS definition, the resulting three-dimensional hull models are readily transferred to analysis and manufacturing systems.
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