Remote Measurements and Vibration Analyses of Existing Wind Turbines
The service life of a wind turbine may be threatened by the collapse of the rotor blades or the supporting tower due to extreme weather. The change of dominant frequency may indicate that the stiffness of the turbine-tower system is deviated from its design. Dynamic measurements of lateral displacement of four 2-MW wind turbines of the same model have been achieved using a ground-based microwave interferometer. The frequency contents of a turbine-tower system can be measured when the rotor is stopped or operates at low to medium speed. The rotor blade exhibits multiple frequencies higher than 1 Hz that can only be measured when the wind turbine is shut down. Possible links between dynamic characteristics and structural integrity of wind turbine—tower systems are discussed. The results of current research are promising in terms of combining non-contact dynamic measurements and vibration analyses towards the condition assessment of wind turbine-tower systems.
This research was made possible by the support of Ministry of Science and Technology Taiwan through project number MOST 103-2221-E-324-003 and NSC 102-2221-E-324-015. Additional support also came from the research grants of Chaoyang University of Technology.
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