Research On PC-based Integrated Simulation Platform And Its Key Technologies Of Virtual Prototype

Nowadays, the diversified and individualized demands on products are pushing enterprises to design the best-quality products in minimum environmental loads, which meet the demands of the market, in the shortest time and at the lowest cost. The technology of virtual prototype can undoubtedly help enterprises to solve the problems mentioned above. However, due to its costliness, the virtual prototype is beyond the reach of the vast potential and small-scale users, who indeed require the technology. The purpose of this dissertation is to study the principle and method of realizing the integrated simulation platform of virtual prototype on personal computers, in order to meet the needs of vast potential small-scale users. The contents and achievements are as follows:①It is the foundation of developing virtual prototype to construct assembly model. The advantages and disadvantages of the existing assembly model are pointed out through studying on relational models separately. At the same time, a new virtual assembly model on the basis of extensible group node is brought forward. Several kinds of simulation functions are considered in this assembly model, which include virtual assembly, virtual manufacturing, working process, and visualization in engineering analysis.②In this dissertation, the frame structure of the PCISPVP, the mutual mode and operation mechanism within the PCISPVP are proposed. The workflow of the PCISPVP is discussed, through which users can develop virtual prototype. Finally the technology of setting up the stage in common use is proposed.③Multi-mode interaction between human and computer is implemented in accordance with the interactive characteristic of personal computers. The craft personnel can develop virtual prototypes through using the multi-mode interaction easily. One method of interaction is based on text formatting. The author has defined the grammar of V language, and carried on the realization of the principle on logic. Using this interactive format, developers can construct virtual prototype simply. Another method of interaction is based on combining scene graphics defined in this dissertation with Open Inventor engine mechanism. One more interactive mode is based on virtual controller, through which users can interact with virtual prototype on net. The data structure of the human-computer interaction mode based on three-dimensional mouse technology is provided in addition.④The key realization technologies related to manufacturing and working process simulation, which include cutting simulation, three-dimensional show, color change, particle system, transparency transform controlled by time accurately, etc, are studied in this dissertation.⑤Visualization in system engineering analyses includes two kinds of functions. One is to simulate the real-time physics of the cutter temperature field with a small datum quantity. The other is to display the after-treatment results of great datum quantity. Using the interface that has been developed between PCISPVP and FLUENT software, the implementation of the virtual demo for craft chambers of PECVD is carried out, which can enhance the visualization impact of data volume. All the researches in this dissertation are developed on PC with Visual C++.NET, Open Inventor 5.0, OpenGL and Unigraphics NX2.0. The application instances, including CJK6430 produced by Shanghai Machine Tool Factory, QZ104 paper cutters produced by Shanghai Shenweida Machinery Co., Ltd. and PECVD equipment of Shanghai solar energy Co., Ltd., are given to validate the correctness of the new theories and technologies provided in this dissertation.