世界科技研究与发展 ›› 2022, Vol. 44 ›› Issue (3): 421-427.doi: 10.16507/j.issn.1006-6055.2021.09.005

• 科研仪器与设施专题刊 • 上一篇    下一篇

固体目标微形变探测仪及其在高铁桥梁的应用

高卓妍1,2 贾岩1,2 刘淑一1,2 张祥坤1,2   

  1. 1.中国科学院国家空间科学中心中国科学院微波遥感技术重点实验室,北京100190;2.中国科学院大学电子电气与通信工程学院,北京100049
  • 出版日期:2022-06-25 发布日期:2022-07-04

Target Micro Deformation Meter and Its Applicationon High-Speed Railway Bridge

GAO Zhuoyan1,2   JIA Yan1,2   LIU Shuyi1,2   ZHANG Xiangkun1,2   

  1. 1. Key Lab of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China; 2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Online:2022-06-25 Published:2022-07-04

摘要:

微形变量在工程上意义重大,可用以判断目标的健康状态和自然灾害的预警。传统的形变监测手段有位移计、加速度计、GPS、三维激光扫描等,存在设备安装困难、工作效率低、受天气影响较大等缺点。因此,结合调频连续波技术和干涉技术,设计了一款固体目标微形变探测仪,操作简便、便携、可全天时全天候进行监测。首先对系统进行室内测试,验证了形变测量精度可达亚毫米级。再对海安特大桥的某32m双线简支箱梁进行微形变监测实验,实验中选取了四个典型监测点,在箱梁上单线加载以及荷载速度相同的实验条件下,系统准确测得梁的1/4和1/2跨的位移量,以及上、下行线1/2跨的位移差异。将测得的时程曲线进一步分析,获得了桥梁的自振频率与强振频率。实测结果与理论分析一致,证明了固体目标微形变探测仪的有效性。

关键词: 微形变监测, 调频连续波技术, 干涉, 偏载, 简支箱梁

Abstract:

Micro-deformation are important in engineering to determine the health state of a target or to warn of natural disasters. Traditional deformation monitoring methods include displacement meter, accelerometer, GPS, 3D laser scanning, etc. However, they have certain disadvantages, such as installation difficulties, low working efficiency and weather sensitivity. Therefore, a solid target micro deformation Meter (TMDM) is designed. The system combines the frequency modulation continuous wave technology (FMCW) and interferometry, which is easy to operate, portable, and can operate all day long. Firstly, the system is tested in laboratory, and the accuracy of deformation measurement is verified to be up to sub-millimeter. Then, the system is used to carry out a micro-deformation monitoring experiment on a 32m double-line simply supported box girder of Haian Bridge. During the experiment, four typical monitoring points are selected. Under the experimental condition of single line loading and the same loading speeds of the girder, the system accurately measured the displacement of 1/4 span and 1/2 span of the beam and the displacement difference of 1/2 span of the uplink and downlink. The natural frequency and forced frequency of the bridge are obtained by further analysis of the measured time-history curve. The measured results are consistent with the theoretical analysis, proving the effectiveness of the TMDM.

Key words: Micro-deformation Monitoring, Frequency Modulated Continuous Wave (FMCW), Interferometry, Eccentric Loads, Simply-Supported Box Girder