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

被引：0
|
作者：
Tian, Yongding [1 ]
Yang, Xiaoyu [1 ]
Yu, Zhixiang [1 ]
Luo, Liru [1 ]
Cheng, Qiang [2 ]
Xu, Hu [1 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu,610031, China
[2] Sichuan Highway Planning, Survey, Design and Research Institute Ltd., Chengdu,610041, China
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 14期
关键词：
Deformation monitoring at a few local measurement points of a flexible barrier system usually makes it difficult to reflect its actual working state; which often causes false warnings. To address the above problem; 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 for the flexible barrier system was developed in the case of captured images containing complex motions. The deformation pattern was also investigated and the maximum deformation of the flexible barrier system was extracted. The proposed method achieved 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 a 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. 201 m; and the relative errors of the maximum elongation value compared with the numerical analysis and theoretical results are 6.19% and 0. 93 % respectively. The proposed method implements 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. © 2024 Chinese Vibration Engineering Society. All rights reserved;
D O I：
10.13465/j.cnki.jvs.2024.14.019
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页码：163 / 171
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