Issue 51

K. Li et alii, Frattura ed Integrità Strutturale, 51 (2020) 386-397; DOI: 10.3221/IGF-ESIS.51.28 393 Figure 9 : Data acquisition. The data of the damaged area can be automatically collected through the buttons on the control box. • 3D Image efficient acquisition Figure 10 shows a scanned point cloud image of the structure acquired in the {O-XYZ} coordinate system. In order to compare the measurement accuracy of the 3D laser scanning system, based on the bending fatigue loading test, 100 laser scanning experiments were performed for each group of structural tests. Figure 10: Structure point cloud diagram. The 3D image of the damaged area is quickly displayed on the computer interface with an average efficiency of 3s per image. The performance of the scanning system was verified. Based on this experiment, the performance of the scanning system was verified. The high-frequency vibration of the detection object can be neglected, the scanning precision is high, and the scanning speed is fast; damage information on the plane and space of the damaged area can be obtained, and the damage situation can be more comprehensively analyzed; the position of the scanner can be arbitrarily adjusted according to the conditions of the on-site inspection site, which is convenient for movement; it is not affected by environmental factors of the detection site, and has strong adaptability. The scanning effective area is a fan-shaped space of 350-750 mm from the scanning sensor with an accuracy of 0.005 mm. The scanning accuracy is high, but the area is small. It is not suitable for scanning large structures. This problem can be improved by replacing the model of the scanning sensor. The effective height of the scan is affected by the length of the slide group. The improvement of this problem can be achieved by increasing the length of the sliding group to meet the engineering structure detection needs.