现代路线CAD系统关键技术研究  

Study on Key Technologies in Developing Modern Road CAD System(Abstract of the Ph. D. Dissertation)

作　　者：蒲浩[1] 詹振炎[1] 

机构地区：[1]中南大学土建学院

出　　处：《中国铁道科学》2005年第4期136-138,共3页China Railway Science

基　　金：铁道部科技发展计划项目(97G23-F)

摘　　要：This thesis applied synthetically the theories and technologies of computer graphics, computational (geometry) and geometrical modeling, scientific (computation) visualization, interactive, virtual reality, computer animation etc to research thoroughly and carefully on several critical technologies of computer aided alignment design, such as digital terrain model, interactive alignment, 3D modeling of route entity, simplification of 3D model, showing realistic image and dynamic and real time display of 3D route scene etc. By thoroughly analyzing the relationship between the 2D horizontal, vertical and cross-section (design) and the 3D visual design, the conclusion could be reached that both are not substituted mutually (this being advocated and the other being cut down), but are mutually replenishing, and supplementing and complementing each other. They should be combined closely and applied synthetically. Based on this idea, the research work was carried out and closely centered on the theories and methods whose characteristic was combining 2D design with 3D design. Consequently not only the improvement of traditional methods of the 2D horizontal, vertical and cross section (design) but also the researches and applications of some new technologies such as 3D visualization, virtual reality etc, had been laid stress on in this thesis .The chief research contents and achievements could be summarized as follows: 1) Based on the theories of Delaunay triangulation and constrained Delaunay triangulation, the (algorithm) for fast and integrally creating irregular (triangulation) net adapted to railway and highway alignment design was put forward and realized. It adopted an integral creating TIN technology which need not divide an enormous sum of topography points into some pieces in advance and could build a whole continuous strip triangle net without seams. Benefit from that, the question of bordering caused by dividing the points into pieces was avoided. The building speed achieved 40 00045 000 triangles per second onThis thesis applied synthetically the theories and technologies of computer graphics, computational geometry and geometrical modeling, scientific computation visualization, interactive, virtual reality,computer animation etc to research thoroughly and carefully on several critical technologies of computer aided alignment design, such as digital terrain model,interactive alignment, 3D modeling of route entity,simplification of 3D model, showing realistic image and dynamic and real time display of 3D route scene etc. By thoroughly analyzing the relationship between the 2D horizontal,

关 键 词：计算机辅助设计 道路工程 三维可视化 模型简化 

分 类 号：U212[交通运输工程—道路与铁道工程] TP391.72[自动化与计算机技术—计算机应用技术]