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| Boundary Extraction of Defect Hole of Aero-Engine Blades Based on Double Decision Criteria |
| LI Jingjun1 , RUI Zhiyuan1 , YAN Changfeng1 , WANG Wenbin2 , WEI Caibin1 |
| (1. School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2. Gansu Luqiao Feiyu Transportation Facilities Co., Ltd., Lanzhou 730050, China) |
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Abstract Due to the complex geometry, scattered position distribution, and obvious curvature change of the defect holes in aero-engine blades, it is difficult to extract the boundary feature points completely by using a single criterion. To realize the accurate boundary extraction of blade defect holes and smooth fitting of the holes boundary line, an algorithm for extracting boundary feature points of aero-engine blade defect holes based on double criteria was proposed. The fitting plane was established based on the spatial topological structure of the sampling point and its K neighborhood points, which transformed the three–dimensional coordinates into two–dimensional coordinates by the local coordinate system. By fusing the criterion of the normal angle of sampling points with the adjacent field power force criterion, the eigenvalue and discrimination threshold of sampling points are obtained by the weighted method, which can be used as the criterion for extracting boundary feature points. The validity and accuracy of the algorithm were verified by two sets of experiments, the experimental results demonstrate that the method can effectively extract the boundary feature points in complex holes model.
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2021, 
