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Research and Implement on Locomotive’s Three-Dimension Parameterized Surface CAD System

Author: ZuoBingRong
Tutor: XiaoShouZuo
School: Southwest Jiaotong University
Course: Vehicle Engineering
Keywords: Train Three-dimensional shape Modeling CAD
CLC: TP391.72
Type: Master's thesis
Year: 2002
Downloads: 184
Quote: 5
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Abstract


In this paper, the train three-dimensional surface shape modeling done a lot of research, and draw extensively on some of the advantages of other application software algorithm. The streamlined shape of the train at home and abroad on the basis of extensive research design-related information on the development of a train shape based on AutoCAD2000 platform CAD system - referred to LSurfCAD, it can basically meet the requirements of the production site the train surface shape design. The main purpose of this study is to explore new easy way to solve the train shape design problems. Obviously, the scope of this study is focused on the train three-dimensional surface modeling. The same time, recent research on train shape design, the understanding of the development trend of the surface shape design. Especially in the shape of the basic theory of three-dimensional curves and surfaces in computer-aided graphic design, as well as use of AutoCAD2000 has a new three-dimensional modeling and ObjectARX2000 technology to develop a suite of applications, through which you can build a train complex shape surface. B-spline curves and surfaces in computer graphics, the most widely used type of parametric curves and surfaces. Moreover, B-spline curve method is the most widely used in computer-aided geometric design of complex surface design and successful way. Train exterior design, the main advantage of the bi-cubic B-spline surface theory, through the surface patches reasonable block and splicing, and to ensure a continuous tangent plane to achieve the shape surface of second continuous. The paper gives a three-dimensional parametric surface modeling method used in the development of train shape CAD system. Based on the detailed analysis of the B-spline curves and surfaces theory, in line with the on-site production of the actual needs of the three-dimensional train shape design method proposed in the paper. As we all know, the the train exterior design including cab and body shape design, and difficulty lies in the shape of the design of the cab, mainly because of its exterior design is analytic surfaces and free-form surface design. The proposed method can easily solve the problem of three-dimensional surface design. The main frame structure of the CAD system includes many functional modules, including the initialization module, parameter design module, module, judging module, three-dimensional surface rendering module, and finite element analysis interface modules and simple aerodynamic analysis module. And in the paper put forward the ideas and methods of how to based on AutoCAD2000 platform using Visual C 6.0 tools and ObjectARX technology to develop their own applications CAD system. The same time, the characteristics of the main module, data processing and interface design technology in the system are introduced in detail. Paper on how to customize your own AutoCAD are also discussed. Part of the application and development of train exterior design is given in the paper. Southwest Jiaotong University Graduate Thesis 11 In short, by train shape 3D parametric CAD system research and development, to achieve a two-dimensional solutions of the train shape with good integration of the three-dimensional program, in particular, to basically solve a class of train three-dimensional surface The difficulty of exterior design. The same time the train appearance CAD system a LSurfCAD is the attempt to combine the three-dimensional surface shape design theory and field technical problems. This can not only greatly reduce the difficulty of live body structure designers design and a heavy workload, and the shape of the computer-aided design for the train will have a greater impact.

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