Research On Technologies Of Automatic Finite Element Mesh Generation On 3-d Surfaces Based On Step

With the aggravation of the market competition, more and more die and mould manufacturing companies begin to apply computer-aided engineering (CAE) analysis software to improve products' quality, however, there usually exist meshes with poor quality in the finite element model generated by those kinds of CAE software and engineers have to do mesh revision. Furthermore, the importing and exporting function of domestic plastics injection mould CAE software are still relatively weak. Thus it is essential to improve the interface function of domestic plastics injection mould CAE analysis software and realize its integration with all kinds of heterogeneous CAD systems. So it is of realistic importance to do the research on automatic high-quality mesh generation on mould surfaces based on STEP.The technologies of automatic finite element mesh generation on 3-D surfaces and the graded mesh control strategy are discussed in this paper. The main research content includes:1 .Model importing and reconstructionResearch and implementation of model importing and reconstruction based on STEP were done; at the same time STEP components based on geometric engine realized the direct connection and integration among heterogeneous CAD systems and CAE systems.2. Model information extractionGeometric and topologic information based on B-Rep model were extracted, which satisfied the need of finite element mesh generation system.3. Advancing front technique was developedBased on Delaunay triangulation method, triangular mesh generation method for 2D parametric plane was set up, and triangular mesh was generated in 2D parametric plane by applying the new developed method.4. Multiple mapping methods based on curvature and graded mesh control strategyThis paper presented an improved parameter mapping method—multiple mapping based on curvature. Boundary division and control strategy dispersed the boundaries of parameter region. Mesh was generated on parameter region by advancing front technique and on 3-D surfaces by inverse mapping. With the help of the multiple mapping and mesh control strategy, high-quality mesh can be generated efficiently.