基于特征的模糊控制电磁场有限元网格生成

Feature-Based Fuzzy Control Finite Element Mesh Generation for Electromagnetic Fields

将特征概念引入电磁场有限元前处理中 ,提出了一种利用模糊控制理论的任意二维区域有限元网格生成的新方法 .该方法根据一些典型特征 ,将整个区域自动划分出若干个特征区域 ,对于每一种特征区域 ,根据模糊理论以及有限元专家经验 ,建立相应的隶属函数和模糊控制策略 ,从而生成具有一定梯度、疏密合理的有限元网格 ,可提高网格质量 ,减少用户手工输入量 .

The concept of feature is introduced into the preprocess of electromagnetic finite element. Employing fuzzy theory, a new technique is proposed to automatically generate finite element mesh for arbitrary plane domains. The whole domain can be divided into several characteristic subdivisions according to some typical features, such as angle areas and air gaps in electrical motors etc.. Then relevant membership functions and fuzzy rules are constructed utilizing fuzzy theory and the experiences of FEM experts. Consequently, the graded mesh is obtained. The present work improves the quality of finite element meshing and significantly decreases the amount of input data.