基于锚固区外置光纤光栅传感器的FAST工程拉索索力监测研究

doi:10.3901/JME.2017.17.023

机械工程学报 ›› 2017, Vol. 53 ›› Issue (17): 23-30.doi: 10.3901/JME.2017.17.023

• 特邀专栏:500 m口径球面射电望远镜（FAST） • 上一篇下一篇

基于锚固区外置光纤光栅传感器的FAST工程拉索索力监测研究

朱万旭¹, 覃荷瑛², 李居泽³, 欧进萍¹

1. 哈尔滨工业大学土木工程学院哈尔滨 150090;
2. 桂林理工大学土木与建筑工程学院桂林 541004;
3. 柳州欧维姆机械股份有限公司柳州 545005

收稿日期:2017-02-28 修回日期:2017-03-30 出版日期:2017-09-05 发布日期:2017-09-05
通讯作者: 欧进萍(通信作者),男,1959年出生,博士,教授,中国工程院院士。主要研究方向为结构控制与健康监测。E-mail:oujinping@hit.edu.cn
作者简介:朱万旭,男,1972年出生,博士研究生。主要研究方向为预应力结构及结构智能健康监测。E-mail:zhuwanxu@vip.163.com
基金资助:
国家自然科学基金（41272358）和广西科技计划（桂科AD16380017）资助项目

Monitoring Cable Force of FAST Project Based on Fiber Bragg Grating Sensor External Installed on Anchorage Zone

ZHU Wanxu¹, QIN Heying², LI Juze³, OU Jinping¹

1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090;
2. College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004;
3. Liuzhou OVM Machinery Co. Ltd, Liuzhou 545005

Received:2017-02-28 Revised:2017-03-30 Online:2017-09-05 Published:2017-09-05

摘要/Abstract

摘要： 500 m口径球面射电望远镜（Five-hundred-meter aperture spherical radio telescope，FAST）工程是我国重大科学工程。索网作为反射面的主要支承结构以及角度调整机构，其索力的实时有效监测对该工程的安全评估与维护起重要作用。提出在拉索的锚杯外壁耦合光纤光栅（Fiber Bragg grating，FBG）传感器测量应变值换算索力的方法。详细理论分析了拉索锚杯的轴向应力应变分布规律，推导出其与拉索索力的关系式；据此选择采用量程为1500με的光纤应变计，沿轴向安装于锚杯内孔大端附近的外壁；并采取了专用安装底座和保护外壳将补偿的温度传感器与应变传感器进行一体固定保护，确保了传感器的安全耐用及温度一体性。该工程的316根拉索索力监测使用了FBG传感器，索网安装完毕后均存活有效。在索网调节期间，将B区边缘索FBG传感器所测数据与辅助调索的测力传感器的进行比较，相对误差在5%以内，满足工程需求。

关键词: 光纤光栅传感器, 锚固区, 射电望远镜, 索力监测, 温度补偿

Abstract: The five-hundred-meter aperture spherical radio telescope (FAST) is a major scientific project in China. The cable net is the main support structure and angle adjusting mechanism of reflector, which effective real-time health monitoring to the cable force plays a vital role in evaluating the safety and maintenance of FAST. A measurement method for cable force by coupling the fiber Bragg grating (FBG) sensor on the surface of cable anchoring cup is presented. The axial stress distribution of the anchoring cup is analyzed theoretically, which relationship with cable force is derived. FBG sensor with measure range of 1 500μɛ is selected and installed along the axial direction on the outer surface of the anchoring cup near the bigger end of inner cone hole. The safety, durability and temperature integration of sensor are secured by the special installation base and protective shell. 316 cables are installed FBG sensors to monitor the cable tension force and each senor is effective after cable net knitting. During the adjustment of the cable net, the measured data of the FBG sensors of the edge cable of the B area is compared with the force measuring by the adjustment system, and the relative error is less than 5%, which meets the engineering requirements.

Key words: anchorage zone, cable force monitoring, fiber Bragg grating sensor, radio telescope, temperature compensation

中图分类号:

TN253
TH743

朱万旭, 覃荷瑛, 李居泽, 欧进萍. 基于锚固区外置光纤光栅传感器的FAST工程拉索索力监测研究[J]. 机械工程学报, 2017, 53(17): 23-30.

ZHU Wanxu, QIN Heying, LI Juze, OU Jinping. Monitoring Cable Force of FAST Project Based on Fiber Bragg Grating Sensor External Installed on Anchorage Zone[J]. Journal of Mechanical Engineering, 2017, 53(17): 23-30.

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基于锚固区外置光纤光栅传感器的FAST工程拉索索力监测研究

Monitoring Cable Force of FAST Project Based on Fiber Bragg Grating Sensor External Installed on Anchorage Zone

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