Assembly Model Quickly Display Technology Research And Realization

The rapid display of large assembly is one of the key techniques of Digital Mock-up. In the thesis, the insufficiency of manipulating large assembly in Unigraphics is improved enormously; a set of comparative perfect resolving scheme according to large assembly, such as large assembly modeling, large assembly simplification and manipulating large assembly rapidly, is summarized, which is very important for shortening the cycle of developing products and saving the cost of enterprises. Main research work and achievements are as follows:Based on assembly modeling of simple products in Unigraphics, the method of large assembly modeling of complex products is put forward. Main idea of the method is that a large assembly is divided into many small subassemblies, at the same time, simplifying geometry of subassemblies. By reference sets, simplification model of complex products is created which is especially useful for browsing its whole shape.In Unigraphics, there are some methods of dealing with large assembly in advanced assembly application, such as representations, product outline, linked exterior and wrap assembly. In the thesis, the disadvantages of those methods were found out and improved. While author summarizes methods of rapid display large assembly using wireframe model, namely simple curves or simple features.Large assembly can be opened quickly with component filters and control switch. A part can be located rapidly in a huge assembly tree by its attribute information, thus the part can be edited in design context. At last, author develops a set of tool with UG/Open application programming interfaces and menu tools. Using the tool, visible parts in a view can be selected automatically and invisible parts can be blanked or closed automatically according to user's requirement. Since amount of parts loaded in memory is reduced, large assembly can be manipulated rapidly.