Abstract
A Computer Aided Design/Computer Aided Manufacturing (CADCAM) system for the design of ship hulls and the production of towing tank models is described. The design portion of the system is implemented on and supported by a three dimensional interactive graphics device and a minicomputer.
The hull surface is modeled using B-spline surfaces. Both smooth surfaces and surfaces with internal discontinuities (knuckles and hard chines) may be modeled. The use of a fast incremental algorithm for modifying these surfaces dynamically in real time (rubber sheeting) is described for real ships. The use of color graphics to display the Gaussian curvature of the surface for fairness determination is described for real ships. A simple algorithm for obtaining accurate sections or contours of B-spline surfaces is described. Its use on real ship hulls in a towing tank model production environment is described.
A microprocessor driven, stand alone graphics device simply, directly and inexpensively interfaced to the CNC controller on the shop floor is used to provide support for the manufacturing portion of the system. A program running in the microprocessor based graphics system provides all post-processing, producing a graphical display for the machine operator and drives the machining center. All functions are accomplished on-the-fly in real time.
The integration of these systems into a Computer Integrated Manufacturing system for the production of wooden towing tank models is described.
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© 1983 Springer-Verlag Tokyo
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Rogers, D.F., Satterfield, S.G., Rodriguez, F.A. (1983). Shiphulls, B-Spline Surfaces and CADCAM. In: Kunii, T.L. (eds) Computer Graphics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-85962-5_3
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DOI: https://doi.org/10.1007/978-3-642-85962-5_3
Publisher Name: Springer, Berlin, Heidelberg
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