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首页> 外文期刊>NDT & E International: Independent Nondestructive Testing and Evaluation >Dynamic characteristics of suspension bridge hanger cables using digital image processing
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Dynamic characteristics of suspension bridge hanger cables using digital image processing

机译：利用数字图像处理的悬索桥吊索动态特性

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摘要

In this study, a non-contact measurement method is proposed to estimate the tension in hanger cables by using digital image processing. Digital images were acquired through a vision-based system using a portable digital video camera (camcorder), which was used to remotely measure the dynamic responses and was chosen because it is convenient and cost-efficient. Digital image correlation technique, as one of digital image processing algorithms, was applied to develop an image processing algorithm. An image transform function was used to correct the geometric distortion between the deformed and undeformed images and to calculate the subpixels. The motion of the vision-based system caused by external wind or vibration at camera location was corrected considering a fixed object in the image without any additional sensors. Using this algorithm, the dynamic response of the hanger cable and the resolution of the modal frequencies were improved. It was also confirmed that the dynamic characteristics of the hanger cables can be estimated with only the cable shape not attaching any target.
机译：在这项研究中，提出了一种非接触式测量方法，通过使用数字图像处理来估计衣架电缆中的张力。通过使用便携式数字摄像机（便携式摄像机）的基于视觉的系统获取数字图像，该数字摄像机用于远程测量动态响应，因此选择数字图像是因为它方便且具有成本效益。作为数字图像处理算法之一，数字图像相关技术被用于开发图像处理算法。使用图像变换功能来校正变形和未变形图像之间的几何变形，并计算子像素。考虑到图像中没有任何附加传感器的固定物体，可以校正由摄像机位置的外部风或振动引起的基于视觉的系统的运动。使用该算法，改善了吊架电缆的动态响应和模态频率的分辨率。还证实了仅在电缆形状未附着任何目标的情况下，就可以估算出吊架电缆的动态特性。

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