An Online and Vision-Based Method for Fixtured Pose Measurement of Nondatum Complex Component

• Published in: IEEE transactions on instrumentation and measurement 2020-06, Vol.69 (6), p.3370-3376
• Main Authors: Hou, Dongxiang, Mei, Xuesong, Huang, Wangwang, Li, Jiang, Wang, Chunjie, Wang, Xu
• Format: Article
• Language: English
• Subjects: Aerospace industry; Burrs; Coordinate measuring machines; Deformable models; Deformation; Deformation effects; Deformation mechanisms; Error analysis; Error reduction; Feature extraction; Iterative methods; iterative optimization; laser automatic shape trimming; Measurement by laser beam; Measurement uncertainty; Model accuracy; nondatum complex component (NDCC); online pose measurement; Optimization; Strain; Three-dimensional displays; Trimming; Vision; vision based
• ISSN: 0018-9456; 1557-9662
• DOI: 10.1109/TIM.2019.2937530

The nondatum complex component is a complex component and does not have reliable positioning/measurement datum during the modification process. With the rapid development of the aerospace industry, the manual manner of shape trimming for the nondatum complex component needs to be replaced by laser automatic shape trimming. This study develops a vision-based, online, and high-precision method for measuring the fixtured pose error of the component. Limited by burrs, deformation, and complex structure, the feature-based method is not applicable to this component. The present method is based on iterative optimization and not required feature extraction. To improve pose measurement efficiency and accuracy, the optimization of the reference model can effectively reduce the error caused by deformation. The experiment results showed that the proposed method is fast and accurate, and satisfied the measurement requirement of the fixtured component's pose in six degrees-of-freedom.