IEA Wind TCP Task - NREL
Dec 01, 1998 · Tower and Monopile Properties The tower and monopile were designed as an isotropic steel tube. Frequency considerations constrained much of the design in that the first tower-monopile mode, 0.17 hertz (Hz), lies between the 1P and 3P blade passing frequencies for all wind speeds. This is also sufficient to avoid the range of highest energy ...
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