摘要
飞机结构件数模中常存在狭窄拓扑面,易导致零件在加工成型过程中的各工程操作难以进行。针对该问题,提出基于参数域边界分析的CAD模型窄面缺陷自动识别方法。首先对飞机结构件数模中常见的窄面缺陷进行描述与分类,并结合其几何特点与工程意义对窄面缺陷进行了合理的定义;其次,对模型表面的任意拓扑面计算其有效参数域;然后,根据凹顶点构造狭窄区域,并计算狭窄区域的长度和宽度,判断其是否为窄面缺陷;最后,给出方法的实现流程并开发了相应的算法,结合实例证明了所述方法的正确性和有效性。
There are always narrow topological faces on the CAD model of aircraft structures, which is prone to lead a series of engineering operations to fail in the manufacturing process of part. To solve this problem, an automatic narrow face error detection technique for CAD model based on the analysis of parameter district boundaries is proposed. First, the common narrow faces of aircraft structural CAD model are depicted and classified. And, based on the geometrical characteristics and the engineering requirements, the narrow face error is defined. Second, the effective parameter district of each topological face on the CAD model is computed. Third, the narrow district is constructed according to reflex points. After that, the length and the width are calculated to judge if the topological face is a narrow face error. Finally, the algorithm flow of this technique is given and implemented. The experimental results are showed to prove that the presented method is both correct and effective.
出处
《图学学报》
CSCD
北大核心
2016年第5期648-654,共7页
Journal of Graphics
基金
中航工业产学研专项资金(cxy2013BH06)
