基于视频图像处理技术的振动台试验动态位移测量方法

Measuring method of dynamic displacement in shaking table test based on the technology of video processing

动态位移是振动台试验中的重要测量参数,由于受到测量条件的限制,常规的接触式动态位移测量方法往往难以实施。文中基于数字图像处理技术研究了振动台试验中动态位移的非接触式测量方法并开发了相应的程序。首先,使用数码摄像机获取结构上人工标靶的视频图像;然后,利用视频图像处理程序对采集到的图像进行处理,实现测点位置的自动识别与跟踪,从而得到测点位移的动态时程曲线。将该方法应用于某桥梁振动台试验中,较为简便的实现了板式橡胶支座变形和滑动位移参数的测量,且达到了较高的测量精度。

The dynamic displacement of the structure in shaking table test is an important measurement parameter. Usually because of the limited conditions, the contact-type displacement methods are used difficultly. In this paper, a dynamic displacement measurement method based on the technology of videos processing was studied and the~ corresponding program was developed. First, the symbol points attached to the tested structure are captured by the digital video camera. Second, the video images are processed to recognize and track the symbol points. Then Ih（ displacement curves in time domain are acquired. In a bridge-model shaking test, the deformation and sliding displacement of the laminated robber bearings are measured with the proposed method. The results show that the method is easily operated and has a high measure precision.