Vision-based methodology for the impact large deformation monitoring of a flexible barrier

TIAN Yongding1,YANG Xiaoyu1,YU Zhixiang1,LUO Liru1,CHENG Qiang2,XU Hu1

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 163-171.

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PDF(3435 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 163-171.

Vision-based methodology for the impact large deformation monitoring of a flexible barrier

  • TIAN Yongding1,YANG Xiaoyu1,YU Zhixiang1,LUO Liru1,CHENG Qiang2,XU Hu1
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Abstract

Deformation monitoring at few measurement points of flexible barrier systems makes it difficult to feedback on its actual working state, which often causes false warnings. To address the above problems, a multipoint and distributed vision monitoring method for flexible barrier systems was developed. The full-field two-dimensional velocity of the flexible barrier system under rockfall impact was calculated by the optic flow algorithm. A full-field two-dimensional velocity amplitude distribution map was constructed and the velocity distribution difference map of adjacent frames was used to track the deformation state of the flexible barrier system in real-time. In addition, a highly robust dense deformation extraction algorithm of the flexible barrier system was developed in the case of captured images containing complex motion. The deformation pattern was also investigated and the maximum deformation of the flexible barrier system was extracted. The proposed method achieves a breakthrough from limited point monitoring to infinite distributed sensing. A full-scale experimental model of a three-span flexible barrier system was designed, the rockfall impact test with an energy of 750 kJ was conducted, and the high-speed camera was used to remotely capture image data of the flexible barrier under rockfall impact. The results show that the proposed method realizes the noncontact monitoring and the whole process tracking of the deformation pattern of the flexible barrier system under rockfall impact, the impact process has three stages, namely, rockfall contact, maximum impact deformation, and rebounded movement. To verify the robustness of the developed method, dynamic deformation curves at the middle span of the flexible barrier system under rockfall impact were extracted. It is found that the maximum elongation value of the flexible barrier system under the impact energy of 750 kJ is –6.201m, and the relative error of this value between numerical analysis and theoretical result are calculated to be 6.19 % and 0.93 % respectively. The proposed method in this paper has achieved the remote work condition monitoring of flexible barrier systems, which has the potential to be applied to the performance evaluation of flexible barriers under rockfall disasters.

Key words

flexible barrier / rockfall impact / impact large deformation / computer vision / full-scale test

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TIAN Yongding1,YANG Xiaoyu1,YU Zhixiang1,LUO Liru1,CHENG Qiang2,XU Hu1 . Vision-based methodology for the impact large deformation monitoring of a flexible barrier [J]. Journal of Vibration and Shock, 2024, 43(14): 163-171

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