Quick Render Technology Research On Virtual Assembly System Of Sophisticated Product

With the rapid development of the domestic railway transport sector, a large number of high-speed EMUs are introduced into rail passenger and freight, which has made the related industrial chain of EMUs face tremendous opportunities and challenges. In the related industrial of EMUs, no doubt that the assembly and maintenance of EMUs occupy a great proportion of the industrial chain. EMU has a complex structure and a large volume. Its assembly and maintenance are considerable inconvenience. To ensure the secure and economical running of EMUs, making the skilled workers skillfully and quickly grasp the assembly and maintenance techniques of EMUs has played a vital role for the rapid development of the rail transport industry. Bogie whose structure is complex is one of the most critical components of the high-speed EMUs. Meanwhile, it takes most of the proportion of EMU maintenance costs. Under the circumstances of plant laboratory, as the limited number of laboratory equipment and the high cost of maintenance, and bogie is related to the safe operation of the EMUs, freely demolition to bogie would do harm to the security of EMUs, so the training for skilled workers in assembly and maintenance is subject to conditions. Therefore, the development of virtual simulation system is very necessary for the assembly and maintenance of complex products, and its must vigorously develop the virtual assembly technology.The paper takes the CRH2bogie of EMUs as the experimental target, which is the most widely used in our domestic EMUs. Taking CRH2as the target can make a symble significance. In the first part of the article, we introduces the research background of issue, virtual and reality field and the related technology development of virtual maintenance. And we make a detailed introduction to the current study, as well as the development of related technologies in the field of virtual reality. Virtual assembly system is an extension of the field of virtual reality in the machinery industry. In virtual assembly system, the first problem to solve is how to guarantee the system to run normally when vast amouts of data loads, and also it will not result in frame delay and the system crashes. Although computer hardware technology has been rapidly developed, its performance sill unable to meet the real-time rendering of massive data. In the rest part of the article, we put forward some measures to solve such question as massive data rendering. We take OSG platform as the research framework. It is based on the scene graph structure which is the widely used in the current virtual simulation system. In this article, we take OSG platform as framework to have researches. OSG is a perfect virtual simulation platform, which is based on scene-tree structure. In this paper, we do much work to study the scene-tree structure and the rendering. In addition, according to the theory LOD and pagedLOD. we improve the algorithms and theory on massive data processing, and also we propose a new algorithm about dynamic data scheduling and data reduction. At last, we put forward a model for fast rendering algorithm based on KD-TREE. and we give verification to this algorithm.