特征识别, 拓扑不固定特征, 层, 飞机结构件

According to the difficulties in building predefined feature library because of variable topology, a layer-based recognition methodology was presented for aircraft structural parts. Analyses on features of aircraft structural parts show the characteristics of variable topology with directional characteristics and hierarchy distribution. The layer-based recognition dealt with interacting layers by adding virtual edges and extracted features by recognizing and combining layers. The method dealt with features with variable topology, recognized interacting features by combining layers and generated reasonable feature interpretations according to the association between layers. A feature recognition system based on the CATIA V5 platform was developed, which has been applied in a large aviation enterprise.