本文選題：射電望遠(yuǎn)鏡 + 光纖光柵傳感器�。� 參考：《機(jī)械工程學(xué)報(bào)》2017年17期

【摘要】：500 m口徑球面射電望遠(yuǎn)鏡(Five-hundred-meter aperture spherical radio telescope,FAST)工程是我國(guó)重大科學(xué)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(jī)構(gòu),其索力的實(shí)時(shí)有效監(jiān)測(cè)對(duì)該工程的安全評(píng)估與維護(hù)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(cè)量應(yīng)變值換算索力的方法。詳細(xì)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(jì),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(hù)外殼將補(bǔ)償?shù)臏囟葌鞲衅髋c應(yīng)變傳感器進(jìn)行一體固定保護(hù),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(cè)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(cè)數(shù)據(jù)與輔助調(diào)索的測(cè)力傳感器的進(jìn)行比較,相對(duì)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(xué)土木工程學(xué)院;桂林理工大學(xué)土木與建筑工程學(xué)院;柳州歐維姆機(jī)械股份有限公司;
【基金】：國(guó)家自然科學(xué)基金(41272358) 廣西科技計(jì)劃(桂科AD16380017)資助項(xiàng)目
【分類號(hào)】：TH751;TP212

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