Three-dimensional vibration measurement method for lightweight beam based on machine vision
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摘要:
振动测量是状态检测和故障诊断的方法之一，针对传统接触式测量方法中存在负载效应等问题，对基于机器视觉的三维振动测量方法进行了研究。首先，基于视频相位的二维振动测量方法，提取出相机所采集图像中被测目标的二维振动数据。然后，在二维振动测量方法的基础上，结合双目立体视觉，设计了一种基于机器视觉的三维振动测量方法。最后，进行了悬臂梁的振动测量实验。结果表明：所提方法可以实现无接触和无标记的振动测量，并能准确测量出三维的振动信息。
Abstract:Vibration measurement is one of the methods of state detection and fault diagnosis. In view of the loading effect in the current contact vibration measurement method and other problems, this paper studies the three-dimensional vibration measurement method based on machine vision. First, based on the two-dimensional vibration measurement method of video phase, the two-dimensional vibration data of the measured object in the image collected by the camera is extracted. Then, on the basis of two-dimensional vibration measurement method, combined with binocular stereo vision, a three-dimensional vibration measurement method based on machine vision is designed. Finally, the vibration measurement experiment of cantilever beam is performed. The experimental results show that the proposed method can realize non-contact and label free vibration measurement, and can accurately measure the three-dimensional vibration information.
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图 3 左相机水平方向位移信号测量结果
Figure 3. Measurement results of horizontal displacement signal of left camera
图 4 右相机水平方向位移信号测量结果
Figure 4. Measurement results of horizontal displacement signal of right camera
表 1 重投影误差计算结果
Table 1. Reprojection error calculation results
帧数 重建所得的坐标/mm 重投影误差/pixel x y z 左相机 右相机 1 7.584 -114.794 880.039 0.043 0.051 2 7.590 -114.792 880.037 0.045 0.052 3 7.583 -114.791 880.036 0.042 0.051 4 7.579 -114.793 880.037 0.044 0.053 5 7.587 -114.793 880.037 0.041 0.051 6 7.589 -114.791 880.036 0.043 0.052 7 7.581 -114.792 880.039 0.044 0.054 8 7.581 -114.794 880.038 0.041 0.053 9 7.589 -114.793 880.037 0.046 0.052 10 7.586 -114.790 880.039 0.044 0.052 
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