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Title : ANALYSIS OF EXTREME WIND SHEAR EVENTS
Authors : Kurt S. Hansen, Gunner Chr. Larsen and Bo Juul Pedersen

Summary :
In order to continue cost-optimization of modern large wind turbines it is important to continuously increase the knowledge on wind field parameters relevant to design loads. This paper seeks to evaluate requirements, as given in the IEC 61400-1 code, for short-term extreme wind shear relevant for ultimate loading. The evaluation is based on wind speed measurements extracted from the “Database on Wind Characteristics” (www.winddata.com). Distributions for wind shear with short averaging time are estimated. Further, methods for extrapolation of the wind shear profiles to heights up to and above 100m are specified and evaluated.

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