Measurement of strain and bending deflection of a wind turbine tower using arrayed FBG sensors

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• 作者：Hyung-Joon Bang (1)
  Hong-Il Kim (2)
  Kang-Su Lee (3)
  
• 关键词：Optical fiber sensor ; Structural health monitoring ; Fiber Bragg grating ; Wind turbine ; Shape estimation
• 刊名：International Journal of Precision Engineering and Manufacturing
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：13
• 期：12
• 页码：2121-2126
• 全文大小：1400KB
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  9. Li, C. J. and Ulsoy, A. G., 鈥淗igh-precision measurement of tool-tip displacement using strain gauges in precision flexible line boring,鈥?Mechanical Systems and Signal Processing, Vol. 13, No. 4, pp. 531鈥?46, 1999. CrossRef
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• 作者单位：Hyung-Joon Bang (1)
  Hong-Il Kim (2)
  Kang-Su Lee (3)
  
  1. Wind Energy Center, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, South Korea, 305-343
  2. Dept. of Aerospace Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, South Korea, 305-701
  3. Green & Industrial Technology Center, Korean Register of Shipping, 23-7 Jang-dong, Yuseong-gu, Daejeon, South Korea, 305-343
  
• ISSN：2005-4602

文摘

This paper introduces a fiber Bragg grating (FBG) based arrayed sensor system for use in the measurement of strain and bending deflection of an 1.5 MW wind turbine tower, and describes the results of field tests of structural monitoring of turbine start and feathering load conditions. A wavelength division multiplexing (WDM) FBG interrogator was developed with a spectrometer-type demodulator based on a linear photo detector for high-speed strain sensing. Real-time shape estimation of the wind turbine tower was accomplished using strain data gathered by surface mounted fiber Bragg grating sensors. The finite element model of the wind turbine tower was created and the displacement-strain transformation (DST) matrix on the basis of the modal approach was obtained. To monitor the dynamic structural behavior of the wind turbine, 10 FBG sensors were arrayed and installed on the inner surface of the tower located at the primary wind direction. The time histories of the strain were gathered using the FBG sensors and the deflections of the tower top position were simultaneously transformed using the DST matrix. Finally, the full deflection shapes of the tower were successfully estimated using arrayed FBG sensors.