Rivet Flatness Measurement Method Based on Binocular Multi-Line Structured Light
WANG Dezhong 1 , HUANG Xiang 1 , LI Shuanggao 1 , LI Gen 2
1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016, China ;
2. Suzhou Research Institute of Nanjing University of Aeronautics and Astronautics, Suzhou 215000, China
Abstract：As for rivet flatness measuring, the measurement methods using traditional gage measurement or non-contact point cloud scanning have disadvantages such as large limitations, long preparation periods and difficult data processing. In response to the above problems, this paper proposes a method for measuring the flatness of rivets based on binocular multi-line structured light. Firstly, binocular matching and reconstruction are performed on the structured light image collected by the binocular system, and the measured coordinate system is extracted and fitted. Next, discrete point screening proportional coefficient is introduced to optimize the fitting accuracy of local skin plane and then the discrete point screening scale factor is introduced to further optimize the fitting accuracy of the local skin plane, and finally it is substituted into the rivet flatness measurement model to perform calculations to obtain results. Compared with the traditional contact measurement and point cloud scanning, this method saves a lot of time for point cloud data processing and improves the measurement efficiency, and can complete the detection task of narrow cavity such as the aircraft inlet by mechanical arm equipped with a small measurement terminal, which reduces limitations. The experimental results show that this method is applicable to both concave and convex features of the rivet head, and the maximum measurement error of rivet flatness is less than 0.03mm, which meets the requirements of visual measurement of rivet flatness
2021, 
