Structural health monitoring of wind turbines using fiber Bragg grating based sensing system
2011
As the size of wind turbines increases, the early detection of structural instability becomes increasingly important for
safety. This paper introduces a fiber Bragg grating-based sensing system for use in multi-MW scale wind turbine health
monitoring, and describes the results of preliminary field tests of dynamic strain monitoring of the tower structure of an
onshore wind turbine. For this research, the Korea Institute of Energy Research (KIER) and the FiberPro, Inc. cooperated
on the development of a wavelength division multiplexing (WDM) Bragg grating sensing system for high-speed strain
sensing. The FBG interrogator thus developed can be used in the sensing of high-speed vibration as well as low-speed
dynamic strain. In the case of high-speed sensing, the interrogator allows a sampling ratio of over 40 kHz for six linearly
arrayed FBG sensors per channel. To monitor the dynamic strain behavior of the tower and substructure of onshore and
offshore wind turbines, 41 FBGs were installed on the supporting structures of the wind turbines. As a result, the Bragg
grating sensing system showed stable, accurate performance in the thermal chamber test and good dynamic strain
sensing performances during the strain monitoring of the tower structure at the Woljeong test-bed wind turbine in Jeju
Island.
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