Auslegung einer Elastomerabdeckung für die flexible Hinterkante eines Windenergierotorblattes
2018
Increasing shortage of fossil energy sources and an accelerating climate change make the ex-pansion
of renewable energies necessary more then ever and therefore lead to higher energy outputs in
the segment of wind energy turbines. In the last years there has been a tendency to constantly
bigger and more powerful turbines. The combination of structural loads due to the rotorblade’s
own mass, the vertical wind profile and blasts have negative effects on the overall life span of
the system. Therefore the German Aerospace Center (DLR) is researching on smart rotorblades
with flexible trailing edges, which can reduce the cyclic loads as quickly activated actuators. One
central component of this concept is an elastomeric sealing between the trailing edge and the fixed
wing profile. The currently used version though is not fully operational due to material failures.
After presenting the state of the art and basics of elastomeric material science in this master thesis
the currently used elastomeric material is transferred into a nonlinear parametric finite element
model. The model is then checked on numeric ruggedness e.g. numerical convergence. By using a
parameter study optimized geometrical shapes are calculated and then built as prototypes. These
prototypes are finally veryfied in cyclic tension tests in comparison to the currently used reference
geometry and as a validation of the calculations done beforehand.
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