STL格式的PIM仿真软件前处理系统

在粉末注射成形(PIM)仿真软件的前处理部分,需要由三维CAD实体模型生成三角形网格.为了实现PIM仿真软件的前处理系统,提出了一种生成三角形网格的算法,它从STL格式文件中获取网格边界,并且将边界离散化,然后由离散化的边界点自动生成有限元网格.根据该算法,实现了粉末注射充模仿真软件MoldFill的前处理系统,给出了一个网格生成的实例,在实例中生成节点865个,三角形单元1752个,占用CPU时间0.125s.此算法可以适应任意形状的单连通或多连通域实体,较好地解决了前处理系统的网格生成问题,对于同类型的CAE仿真软件开发具有参考价值.

Pre-processing system of PIM simulation software for STL

Triangular meshes need to be generated from 3D CAD solid model in the pre-processor of simulation software for Powder Injection Molding(PIM). In order to get the pre-processor, an algorithm of mesh generation is proposed, which gets mesh boundary data from STL files, disperses the boundary and automatically generates meshes of finite elements from dispersed boundary points. Based on the algorithm, the pre-processor of PIM simulation software MoldFill is built up,with an example provided, in which 865 nodes and 1 752 elements are generated, 0.125 s CPU time is taken. The algorithm can be applied for solids of simply or multiply connected region in arbitrary shape, and can be used to generate higher quality meshes and solve the problem of mesh generation for the pre-processor. So it is significant for the development of similar CAE simulation software.