Environmental Engineering Reference
In-Depth Information
The calculated tower displacements are presented for each soil type in
Figs.
12.28
,
12.29
, and
12.30
. The simulation time equals to 1,000 s and 600 s of
it are used for the evaluation. To improve the numeric accuracy, the time step is
reduced for hard soil to 0.001 s and for other soil types to 0.005 s. Tower vibra-
tions
with
hard
soil
and
medium
hard
soil
show only
a
minor
difference,
Fig. 12.28 Tower deflection time histories of the onshore reference wind turbine for the cut-in,
rated, and cut-out wind speeds—Hard soil
Fig. 12.29 Tower deflection time histories of the onshore reference wind turbine for the cut-in,
rated, and cut-out wind speeds—Medium hard soil
Fig. 12.30 Tower deflection time histories of the onshore reference wind turbine for the cut-in,
rated, and cut-out wind speeds—Soft soil
