基于模糊推理的飞机结构件平顶筋自动识别方法

分析平顶筋的几何、参数和工艺属性并给出平顶筋的表示模型；给出识别原理及识别方法的关键技术，包括：建立结构件模型的属性邻接图，计算结构件计算机辅助设计（CAD）模型中面和边的属性并对图中元素赋值；设计主面识别加权关联规则，运用模糊推理从属性邻接图中提取平顶筋主面；以平顶筋主面为种子面，搜索其他关联特征面；给出方法的实现流程并开发相应的算法，实现飞机结构件平顶筋的自动识别.实例测试及应用表明，该算法是正确且高效的，所识别出的平顶筋能直接映射到后续的加工操作中，用于筋特征数控加工的自动编程.

Automatic recognition method based on fuzzy inference for planar-top rib in aircraft structural parts

First, the geometric, parametric, and process attributes of planar-top rib were analyzed; the representation model of the planar-top rib was given. Second, the principle of recognition was introduced as well as the key technologies of the recognized method. The attribute adjacency graph of the structural part model was constructed; the attributes of the faces and edges of the computer-aided-design (CAD) model were calculated to assign the values to elements of the graph. The weighted relative rules for identifying the main face were designed; then the main face of planar-top rib was abstracted from the attribute adjacency graph by fuzzy reasoning method. Other relative feature faces were searched while the main face of planar-top rib was defined as seed face. Finally, the flow chat of this proposed technique was given and the algorithm was implemented to identify the planar-top rib in aircraft structural automatically. According to the test examples and application, the approached recognition method is correct and efficient. Meanwhile, the recognized rib feature by this approach can be applied directly into the successive machining operation for automatic numerical control programming.