Development of accurate and precise measurement methodof large wind turbine blades' wind-induced responses during its operation

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The objective of the study is to develop a simple and accurate measurement method of the wind-induced response of wind turbine blades under its operation. A 3 dimensional motion analysis software was used. In order to obtain the blade tip vibration, two hi-speed cameras had to be set so that they conform to the similarity between the measurement and the calibration. An accurate coordinate transformation was also necessary. The obtained response in along-wind direction sometimes had error caused by miss-tracing of the blade tip, and may not be accurate enough. But the response characteristics of the blades could be obtained to some extent