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

发布时间：2018-06-06 04:09

本文选题：射电望远镜 + 光纤光栅传感器　；参考：《机械工程学报》2017年17期

【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。
[Abstract]:The 500m aperture spherical radio telescope (500-hundred-meter aperture spherical radio telescopeFAST) project is an important scientific project in China. As the main supporting structure and angle adjusting mechanism of the reflector, the real time and effective monitoring of cable force plays an important role in the safety evaluation and maintenance of the project. This paper presents a method for measuring the conversion of cable force by fiber Bragg gratings coupled with fiber Bragg grating (FBG) sensor on the external wall of anchor cup in cable. The distribution of axial stress and strain of cable anchor cup is analyzed in detail, and the relationship between the stress of cable and cable force is deduced, according to which the fiber optic strain gauge with measuring range of 1500 渭蔚 is selected and installed in the outer wall near the large end of the hole in the anchor cup along the axial direction. The special mounting base and the protective shell are adopted to protect the compensated temperature sensor and strain sensor in one body, which ensures the safety and durability of the sensor and the unity of temperature. The FBG sensor is used to monitor the cable force of 316 cables in this project. In the period of cable network adjustment, the relative error between the data measured by the FBG sensor of the edge cable in B area and the force sensor with auxiliary cable adjustment is less than 5%, which meets the engineering requirements.
【作者单位】：哈尔滨工业大学土木工程学院;桂林理工大学土木与建筑工程学院;柳州欧维姆机械股份有限公司;
【基金】：国家自然科学基金(41272358) 广西科技计划(桂科AD16380017)资助项目
【分类号】：TH751;TP212

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