Study On Ship Hull Three Dimensional Modeling Application Technology

According to China's shipbuilding continues to expand the scale, there is an urgent need for a new practical, technical and ability to improve the actual application development, take the computer-aided geometric modeling theory as a guide, make full use of software which has become mature and popular in domestic and foreign, deepening and refining the advanced ship CAD technology, opened up new ways and new methods in technology practicability. Now, large number of engineering and technical personnel lack of a comprehensive grasp of the ship hull curves and surfaces generation algorithm , basis on research results of the conclusion of domestic and foreign scholars , making integrated and comprehensive in-depth analysis to B-spline surface NURBS curves of the geometric definition, parameter forms, nature and the corresponding curves and surfaces interpolation algorithm for algorithm realization, Elaborating the hull curves and surfaces algorithm steps and calculation process with examples, making hull curves and surfaces generation algorithm truly become closely integrated with the practical application and widely popular technology; giving new ideas of combination of Domestic-made lines fairing software and a powerful abroad general CAD modeling software which for curve modeling to hull surface modeling, A major study will be the key technical issues for realization of the hull surface modeling with the combination HD-SHM software and CATIA V 5 software , includes HD-SHM Line Smoothing and CATIA V 5 surface modeling methods and process. Focus on the problem about the offset line, with three direction fairing and offset line model into a curve model, take the 150 tons of frozen cargo ship which has large Curvature-line changes as an example to study the key application technology to the hull curve modeling with the combining national special hull construction software to general high level CAD software - CATIA V5 surface design module; comparative analysis of the various technical features of AutoCAD secondary development, detailed describing the development and application of AutoCAD Based on VB (VBA), including CAD applications menu design, based on AutoCAD VBA ships, conventional ship static calculation based on the AutoCAD secondary development, geometric elements calculation of the cross-section of the hull based on VBA generated graphics, the use for study results not only of reference by large number of engineering and technical personnel , but also specifying that secondary development of AutoCAD technology having great vitality and important value; comparing the ATIA V5 secondary development methods, high level studying of CATIA secondary development Based on Automation API, with a number of key technologies combination programming examples on CATIA Component Object Model (COM) and its visit, 3D modeling of parts, 3D surface modeling of parts,assembly design,component management,constraint management, carrying out the 3-D modeling and assembly parts in parameter way ; in-depth analysis of the research and application status about domestic and foreign CAD 3D modeling in the hull structure, expatiating method and the overall technical of independent study and development on design consideration, the development process, the hull structure of 3D modeling in the hull structure of object-oriented 3D modeling system, exploration and research for the key technologies, making in-depth study on Constraint-based cross-sections design of the hull in the parameters way , on application of modeling technology in the parametric way based on the characteristics in the hull structure modeling in parametrical way, on the hull structure modeling into the parametric way based on CATIA, on the applications of database technology and 3D structure of the hull Modeling System Development.Through development of CATIA secondary and making common types of structural model of hull and realized the parameters way, intelligence way , meeting the needs of optimizing hull structure design, revealing the result that hull structure 3D modeling technology development based on the general CAD software being entirely feasible, and being with suitable conditions, the application of a broad-based features.This paper made full use of existing technology in domestic and abroad, integrating geometric modeling theory and practical application,research and development facilitate ships CAD practical technologies for the broad masses of the shipbuilding engineers and technisions in light of China's shipbuilding practical application-oriented needs , research achievements have not only application value, but also open their ideal.