Key Technology Research Of Ship 3D Design Platform

Computer aided design software is widely used in the field of ship building industry. Major shipyards in China have a long history of application of TRIBON, NAPA, CATIA, CADDS5 and other software. The shipyards purchase a variety of software for the design and manufacture. Every software system has its unique advantages. Data exchange is not smooth between the systems because of the encapsulation.A ship three-dimensional design platform is designed in the thesis, which use object-oriented technology and XML structured documents. The platform provide data extraction and analysis interface for ship model, the ship 3D model can exchange between ship design software. Paper is as follows:(1) The data interface of hull 3D model is researched based on the whole process of ship 3D design and data flow in this, study the interface 3D model of hull and NAPA, TRIBON and CADDS5 other software,Explore key technology and technologies of the ship 3D design platform which is needed.(2) The expression of the universal model for ship design is studied based on the features of ship shape and structure. Design XML-based hull 3D shape and structure model of the data expression and data storage format. The data expression is independent of any CAX system, and can be used in ship design and manufacture of the various stages of the auxiliary software.(3) Design the interface to ship preliminary design software, and develop tools for rapid modeling of hull surface, Complete the hull surface smoothing in CATIA. The XML-based hull shape model is generated according to offset table and 2D lines drawing of ship. By using CATIA Automation interface, the hull shape model is imported into CATIA, the offset points are connected to generate the smooth hull curves. The hull surface is established by using CATIA shape design module, and shape tools are used to smooth surface. Import the hull surface model to ship preliminary design software NAPA.(4) Develop the interface to ship detailed design and production design software. Analysis the data interface of CATIA software, design the method of extracting hull structure XML model from the CATIA structure model. Extract the geometric structure information from STEP file, extract attribute information from BOM table, extract the structural tree from CATIA component tree, to generate the XML-based hull structure model. Research the data interface and secondary development interface for TRIBON and CADDS5 software. Explore the technical solutions to importing structure model to CADDS5 and TRIBON software.(5) Develop the interface to hull structural strength analysis software. Import ship structure model to Patran by using PATRAN PCL language, will ship structure model is modeling in Patran according to different specifications and rules, achieve the automation of the finite element pre-treatment.Ship 3D design platform for the CATIA, NAPA, TRIBON, CADDS5, PATRAN software provides data exchange interface of the hull molded lines and structure Model. Model data can be exchanged between the various software freely, and to ensure maximum data integrity, to achieve models of different systems exchange and sharing.