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LOD Technology Research on Virtual Assembly System Used in Overhaul and Maintenance of EMU

Author: SunHaoYang
Tutor: MaSiQun；GuoYongWei
School: Dalian Jiaotong University
Course: Applied Computer Technology
Keywords: Virtual Assembly EMU Bogie LOD Bounding box
CLC: TP391.7
Type: Master's thesis
Year: 2010
Downloads: 154
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Abstract


With our introduction of high-speed EMU EMU field related industries are faced with enormous challenges and opportunities , making , the EMU assembly and maintenance is no exception . Bogie is one of the key components for the safe operation of the high-speed EMU , the complexity of the relationship between the structure and assembly , using real equipment for training are very limited in time, space and security , such as the high cost of training and prototype fragile and other issues. In order to overcome the above drawbacks , we must develop a virtual assembly technology . The paper first introduces the research background , virtual reality , the relationship between the virtual repair and virtual assembly . The virtual maintenance is the application of virtual reality technology in the field of maintenance or ; The Virtual Assembly is an important application as of virtual maintenance in the course of practice . Whether virtual assembly and virtual maintenance in the primary face of such a large - scale simulation environment model loaded question , usually due to the simulation environment is more complex model loading slow and even system crashes . The main work of this paper is to solve this problem. Secondly, through the OSG platform library research , analysis of the scene graph structure of the model , the composition of the scene graph structure node and classified at the same time to study the scene graph rendering traversal , the internal structure of the model is done in-depth study , then study the the LOD basic framework to understand the LOD the basic framework of the classification model switching selectivity factor , and is commonly used at this stage of the low -level model simplification algorithm introduced and compared . Turn in the drawing on the advantages of the the discrete LOD LOD continuity theory framework presents obvious discrete characteristics for EMU Bogie various components of the model distribution proposed simplified algorithm based on AABB box model analysis algorithms the advantages and limitations , and on this basis for the point of view of the scene models do further optimization . In this paper, the characteristics of bogie model in the high-level model simplification LOD model simplification technology to do the research and use of the hybrid algorithm to simplify the model , the LOD of new technology in the field of complex industrial products .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Machine-assisted technology
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