基于相机针孔模型的桥梁结构位移监测方法
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作者单位:

1.重庆交通大学土木工程学院;2.深圳大学土木交通工程学院

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中图分类号:

U446.1

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Monitoring Method of Bridge Structure Displacement Based on Camera Pinhole Model
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1.College of Civil Engineering,Chongqing Jiaotong University;2.College of Civil Transportation Engineering,Shenzhen University

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    摘要:

    桥梁的位移响应是桥梁结构健康监测和安全状态评估的重要基础条件。为了充分利用机器视觉测量结构位移的优点,并提高其适用性,可以满足拍摄设备带有姿态角的情况下的结构位移拍摄的精度,本文提出了一种基于相机针孔模型的结构位移监测方法。利用稀疏光流对结构特征点进行追踪,得到亚像素级的图像位移,通过相机成像的光学几何关系,建立了现实世界位移和图像位移之间的解析解,将图像位移代入代数关系,进而得到结构真实位移值。在室内开展简支模型桥动载位移识别试验中,与线性可变差动变压器位移计测量结果相比,在俯仰角在30 °、偏航角在35 °以内的情况下,本文方法位移监测最大误差在6 %以内,满足桥梁结构位移变形监测的应用需求。

    Abstract:

    The displacement response of a bridge is identified as a fundamental condition for the structural health monitoring and safety assessment of bridge structures. In order to fully leverage the advantages of machine vision for measuring structural displacements and to enhance its applicability, a structural displacement monitoring method based on the pinhole camera model is proposed in this study. Sparse optical flow is employed to track structural feature points, achieving sub-pixel level image displacements. By employing the optical geometric relationships of camera imaging, an analytical solution is established between real-world displacements and image displacements. The image displacements are then substituted into algebraic relationships to obtain the true structural displacements. In the indoor experiments on dynamic load displacement identification of a simply supported bridge model, compared to the measurements obtained using a linear variable differential transformer displacement meter, the proposed method achieves a maximum error within 6% for pitch angles up to 30 ° and yaw angles up to 35 °, thereby meeting the application requirements for monitoring the displacement deformations of bridge structures.

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刘俊辰,朱伟铸,周志祥,等. 基于相机针孔模型的桥梁结构位移监测方法[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-11
  • 最后修改日期:2024-05-18
  • 录用日期:2024-05-21
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