Research On Method For Extracting Edge Feature Of Aircraft Skin

In order to ensure the assembly quality of the aircraft,the method of accurate assembly and net edge assembly is generally adopted.Aircraft skin,the edge feature of which is small,belongs to the thin-walled structure components.Due to the existence of aircraft skin's characteristics and high detection precision demands,traditional method,like scratching film method,cannot meet the detection demands.With the development of digital technology,the domestic aviation enterprises have widely used digital measurement equipment for aircraft skin detection,but for the present there are the following problems: firstly,lack of the necessary professional skills can't give full play to the advantages of measuring equipment;secondly,the feature,the result of which cannot directly get from measurement,is lack of corresponding processing algorithms.To solve the problems all above,taking the edge feature of aircraft skin parts as the research object.The planning documents of edge feature are generated by digital definition,and then,the point clouds of edge feature are acquired by laser tracker and T-scan tool according to the planning information.The skin edge feature point is obtained by point cloud data processing algorithm.The main contents of this paper are as follows:(1)A method of digitizing the edge feature of the aircraft skin is studied,and the methods of extracting the edge feature of the aircraft skin part and generating the digitized planning file are put forward.(2)A method of extracting the edge characteristics of aircraft skin is studied.On the basis of the analysis of feature point clouds of the holes,the outer contours and the subsidence edge feature,different edge extraction algorithms are designed to extract the edge features of the skin.(3)The accuracy of the aircraft skin edge feature extraction algorithm is verified,and the application of the algorithm in engineering is validated by a practical example.(4)The software of edge detection of aircraft skin is developed,and the testing process of aircraft skin edge is designed.The function modules of measurement field establishment,edge feature scanning and feature data processing are developed.