基于计算机视觉的结构微小振动识别综述

A REVIEW OF SMALL STRUCTURAL VIBRATION IDENTIFICATION BASED ON COMPUTER VISION

  • 摘要: 基于计算机视觉技术的结构振动识别方法在工程领域取得了诸多研究成果和显著进展。本文首先对传统的计算机视觉结构振动识别方法进行总结评述,指出该方法在结构微小振动识别中目前存在的研究不足。针对这些不足,本文依次从相机自动振动消解(第2节)、单相机二维结构微小振动识别(第3节和第4节)以及多视角三维结构微小振动识别(第5节)这三个逐层递进的方面,系统介绍了相应的改进方法。具体而言,在相机自动振动消解方面,相关方法通过贝叶斯模型的最大似然估计检测得到来自静止背景区域的特征点对,从而估计仅包含相机振动的联合单应性矩阵,为后续的结构振动识别奠定基础;在此基础上,针对单相机二维结构微小振动识别,相关方法使用多频相位恢复模型检测得到噪声影响下的相位信息并去除相位阶跃影响,另外基于压缩感知的稀疏增强技术也被引入从而偏离相位限值以及消除病态估计影响;进一步地,为解决三维振动识别问题,相关方法使用加权相位展开解决相位阶跃和病态估计问题,然后在多视图估计中使用重加权最小化,更彻底地剔除异常点。然而,基于计算机视觉的结构微小振动监测研究仍处于起步阶段,未来的研究重点应聚焦于复杂环境下的振动识别、非线性与大幅振动识别、长时间监测与全寿命周期评估、三维振动识别方法优化以及算法的集成化与工程化应用等方面,以减小各种影响因素造成的误差并提高在结构健康监测中的应用效率和可靠性。

     

    Abstract: Computer vision-based structural vibration identification methods have achieved significant research results and remarkable progress in engineering applications. This paper first summarizes and reviews traditional computer vision-based methods for structural vibration identification, highlighting the current research limitations in recognizing small-amplitude structural vibrations. To address these limitations, the paper systematically introduces corresponding improved methods in three progressive aspects: automatic camera vibration compensation (Section 2), monocular camera-based small-amplitude two-dimensional (2D) vibration identification (Sections 3 and 4), and multi-view three-dimensional (3D) small-amplitude vibration identification (Section 5). Specifically, in terms of camera automatic vibration compensation, related methods utilize the maximum likelihood estimation of Bayesian models to detect pairs of feature points from stationary background regions, thereby estimating a joint homography matrix that only contains camera vibration information, which lays the foundation for subsequent structural vibration identification. Based on this, for monocular small-amplitude 2D vibration identification, relevant methods employ multi-frequency phase retrieval models to detect the phase information under noise and eliminate phase wrapping effects. In addition, a compressed sensing-based sparse enhancement technique is introduced to avoid phase constraint limits and mitigate ill-posed estimation impacts. Furthermore, to tackle a 3D vibration identification, related methods use weighted phase unwrapping to address phase wrapping and ill-posed estimation issues, and then apply reweighted minimization in multi-view estimation to more thoroughly eliminate outliers. However, the research on structural small-amplitude vibration monitoring based on computer vision is still in its early stages. Future researches should focus on the vibration identification under complex environments, on the nonlinear and large-amplitude vibration identification, on the long-term monitoring and full life-cycle evaluation, on the optimization of 3D vibration identification methods, as well as on the integration and engineering application of algorithms to reduce errors caused by various factors and to improve efficiency and reliability in structural health monitoring.

     

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