福海測風塔高頻率光纖光柵結構監測系統可行性評估

FEASIBILITY ASSESSMENT OF HIGH FREQUENCY OPTICAL FBG STRUCTURAL MONITORING TECHNIQUE ON FUHAI METEOROLOGICAL MAST

郭志禹(Chih-Yu Kuo) ； 黃信樺(Hsin-Hua Huang) ； 黃安斌(An-Bin Huang) ； 吳崑瑋(Kuen-Wei Wu) ； 甯敘堯(Hsu-Yao Ning) ； 林大程(Da-Chen Lin) ； 蔡碧紋(Pi-Wen Tsai) ； 詹雅馨(Ya-Hsin Chan)

《中國土木水利工程學刊》 31卷4期 (2019/06) Pp. 387-394

https://doi.org/10.6652/JoCICHE.201906_31(4).0009

摘要

台灣西岸的彰化沿海地區為我國重要的風力資源區域，然而此處海床結構及土壤條件脆弱，對長時間承載高側向負載的風機結構殊為不利，隨時監測了解結構物狀態，成為維運必要項目，如風機塔柱之垂直度或動態行為等。為了測試合適的監測技術，我們於此處的福海氣象觀測塔上安裝光纖光柵結構監測系統，該系統包含4個重錘式測傾儀。系統自2017年7月9日起開始運作，並設定採樣頻率為3 Hz以進行壓力測試，在本文中，我們先展示正常狀態氣象觀測塔之日週期現象，動態頻譜，與最後2017年2月6日花蓮地震前後共兩分鐘長的紀錄，以顯示該系統的監控能力。

關鍵字

光纖光柵 ； 重錘式測傾儀 ； 福海測風塔 ； 花蓮地震

並列摘要

The offshore of Changhua County, Taiwan, is an important wind resourceful area, but unfortunately the seabed has weak soil conditions for structure foundations. These conditions are much unfavorable to wind turbines because they always sustain large and longtime lateral loadings. Constant monitoring of the structures became an indispensable task to ensure good operation and maintenances. Important structural parameters may include the verticalness and dynamic behavior of the wind turbine tower. In searching of suitable structural monitoring techniques applicable in the hash offshore environments, we installed a pioneering optical fiber Bragg grating inclination monitoring system, containing 4 mass tiltmeters, on one of the two offshore meteorological masts in this area, The system started to operate continuously since the July, 7, 2017 and was set to the highest sampling rate, 3 Hz, for stress tests. To demonstrate the long term monitoring capabilities of the system, the records of a usual week-long period and the dynamic spectrum of the week are reported. The paper finally concludes with two-minute records of the exceptional Hualien earthquake occurred on the 6th of February, 2018.

並列關鍵字

FBG ； mass tiltmeters ； Fuhai met mast ； Hualien earthquake