Finite Element Mesh Automatic Generation System Base On The Digital Instrument And The Research Of Scientific Visualization

The Finite Element Method (FEM) has been widely used in many engineering research fields as a strong tool of analyzing projects. For the field of electrical engineering, FEM is also a very important numerical method, which is used in the quantitative analysis and optimum design of engineering problems, such as electromagnetic fields and electromagnetic waves. The foundation of models and the data input are the main bottleneck difficulties which restrict the development and application of FEM. And the kernel of them is the dividing of regions analyzed, e.g. the process of dividing regions is the process of generating meshes, so the generation of fit meshes in the analyzed regions is the first step of FEM. The quality of the meshes directly influences the precision of the numerical analysis, so we can say, it is the key problem in FEA (Finite Element Analysis) that the realization of automatic mesh generation through a fit mesh generation algorithms. Presently, many algorithms of mesh generation (especially for the two-dimension region) have been completely developed and are being widely applied to the practical engineering.This paper discusses in detail the FEA specific application in engineering electromagnetic fields after introducing the fundamentals of FEM. According to the viewpoint of creating FEA system structure, we analyze the theoretical and practical sense of FEM automatic mesh generation system as the pre-processor module of FEA.Constructing geometric model of analyzed object is the first step of mesh generation, in this research subject, we mainly analyze the medical encephalon CT picture ,so we select digital instrument to extract border characteristic points from encephalon CT picture and create the analyzed object geometric model. After describing the fundamentals of serial communication, we discuss in detail how to realize the serial communication between the digital instrument and the computer, finally we realize the function of geometric model building.In this paper we mainly discuss the triangle mesh generation algorithm .By analyzing and researching Delaunay triangulation algorithm and Advancing front algorithm, we design a new algorithm combining the advantages of both methods .At the same time, we improve the weighted method which is used to set internal nodes in analyzed region and take optimum measures to optimize generated mesh by triangle factor of merit method and fourfold mesh encrypt method.At last ,a FEM meshautomatic generation system based on the Visual C++6.0 platform is developed by virtue of Object-Oriented programming idea and C++ Language, meanwhile, correspondingly, combining specific example ,this algorithm is proved to be effective, commonly, reliable, automatic.Lastly, we discuss the implication of scientific visualization and its important significance for practical engineering application. Then we design a interactive GUI to help user to operate this system conveniently. According to the standard of OpenGL, user can executive all kinds of operation of graphic transform and realize the function of visualization processing.