本文選題：射電望遠鏡 + 光纖光柵傳感器��； 參考：《機械工程學報》2017年17期

【摘要】：500 m口徑球面射電望遠鏡(Five-hundred-meter aperture spherical radio telescope,FAST)工程是我國重大科學工程。索網(wǎng)作為反射面的主要支承結(jié)構(gòu)以及角度調(diào)整機構(gòu),其索力的實時有效監(jiān)測對該工程的安全評估與維護起重要作用。提出在拉索的錨杯外壁耦合光纖光柵(Fiber Bragg grating,FBG)傳感器測量應(yīng)變值換算索力的方法。詳細理論分析了拉索錨杯的軸向應(yīng)力應(yīng)變分布規(guī)律,推導(dǎo)出其與拉索索力的關(guān)系式;據(jù)此選擇采用量程為1500με的光纖應(yīng)變計,沿軸向安裝于錨杯內(nèi)孔大端附近的外壁;并采取了專用安裝底座和保護外殼將補償?shù)臏囟葌鞲衅髋c應(yīng)變傳感器進行一體固定保護,確保了傳感器的安全耐用及溫度一體性。該工程的316根拉索索力監(jiān)測使用了FBG傳感器,索網(wǎng)安裝完畢后均存活有效。在索網(wǎng)調(diào)節(jié)期間,將B區(qū)邊緣索FBG傳感器所測數(shù)據(jù)與輔助調(diào)索的測力傳感器的進行比較,相對誤差在5%以內(nèi),滿足工程需求。
[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.
【作者單位】： 哈爾濱工業(yè)大學土木工程學院;桂林理工大學土木與建筑工程學院;柳州歐維姆機械股份有限公司;
【基金】：國家自然科學基金(41272358) 廣西科技計劃(桂科AD16380017)資助項目
【分類號】：TH751;TP212

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本文編號：1985007