The Research Of Adaptive Meshing Based On Moment Method In Communication Vehicular System

The software for Electromagnetic Compatibility Analysis and Forecast is an important means of electromagnetic compatibility design. Method of Moments is the increasingly widespread use of electromagnetic numerical computations, and meshing is a key link in numerical calculation of electromagnetic. In this paper, VC + + language and OpenGL technology develop the the mesh pre-processing module of communication vehicle system EMC simulation software.The RWG vector basis function method of moments is used in Communication Vehicle Systems EMC electromagnetic simulation software calculated,so it requested that the grid is divided into triangular element, and the grid structure is connected vertices vertex topological relationships. At the curvature discontinuity department, increasing mesh density. The connection point(antenna and scattering surface connection point) of the antenna and communication vehicle surface is a regular hexagon, and the contact point is located in the regular hexagonal center. The surface scattering model is covered continuously and completely by all the grid, and the grid can not be overlaped.For the above requirements, this paper presents a kind of constrained triangulation method. This method based on three-point advancing front method can achieved to connect vertices vertex topological relationships to overcome the cracks, overlap, element too narrow and other ill-posed problem, improve the robustness of the algorithm, and introduce binding factor, to achieve a grid size of the dynamic control. Optimizing and smoothing the whole grid system to reduce the size of the grid cell shape differences, so that the overall distribution of the grid is more uniform In the connection point of antenna and the vehicular surface, proposed the algorithm for contact center and difference sets subdivision to ensure that the antenna falls on the regular hexagon center to meet calculation requirements of the RWG vector basis function.In this paper, the grid partition method for changes are good self-adaptability,such as from low-frequency to high frequency,discontinuous surface curvature and lines to surface the connections.The examples show that the proposed method is divided into uniform fine mesh, the algorithm is stable and reliable benefits.