Environmental Engineering Reference
In-Depth Information
Standards
General approach
Terminology
Assess
environmental
data
Gather
characteristic
turbine data
Define load cases
Selection best &
worst location
(depth & soil)
Natural frequency
check
Required pile
penetration depth
Required wall
thickness
Buckling check
Preliminary fatigue
check
Drivability
considerations
Transition piece
design
Design summary
Figure 28: Design steps to come to a support structure design.
5.2 Turbine characteristics
The support structure has one main purpose: to keep the turbine up in the wind,
where it produces energy. Wind turbines are fatigue machines by principle:
with a rotation every 3 s on a desired availability above 98% per year for
20 years, a total of 200 million cycles. It is therefore key to design the support
structure in such a way that the turbine dynamics and the support structure
dynamics to not coincide.
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