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Title:
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Numerical quantification of crosstalk in load measurements on the DEBRA blade
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Author(s):
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Published by:
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Publication date:
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ECN
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1-10-1998
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ECN report number:
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Document type:
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ECN-C--98-073
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ECN publication
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Number of pages:
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Full text:
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21
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Download PDF
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Abstract:
Mechanical load measurements on wind turbine blades are generallyperformed using strain gauges on the blades. The strain gauge positions are
selected in such a way that a strain gauge bridge designed for the
measurement of a certain load shows no or little response to other loads. The
response of load signals to loads for which they are not designed is called
crosstalk. A number of strain gauge bridges have been simulated using ANSYS
and a model of the DEBRA wind turbine-blade, put at ECN's disposal by DEWI
(Germany). The simulated dependencies for the strain gauges at the locations
chosen in reference [1), see report, have been compared with the measured
dependencies to assess the applicability of such simulations for the
prediction of load signals. Furthermore, simulations have been performed of
strain gauges on different positions to gain information on the sensitivity
of the crosstalk effects for the choice of the position. Due to the large
differences in the results of the measurements and simulations it is
concluded that, in this case, the simulations would not have led to a
reliable choice for the location of the strain gauge bridge. Also no clear
preference for the bridges (0"o/90"o or 45"o/135"o) to be used for the
measurement of the edgewise and flatwise moments could be given. 1 ref.
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