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Title:
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Optical motion analysis of wind turbines
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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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1996
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ECN report number:
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Document type:
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ECN-RX--96-043
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Other
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Number of pages:
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Full text:
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5
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Download PDF
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Abstract:
This study aims at discovering the pros and cons of optical motionanalysis of large wind turbines. An optical motion analysis technique used in
other fields of science is applied for the first time to a wind turbine.
Modes of motion of the tower and the blades were measured dynamically and
accurately in only a few weeks, including preparation time. Two video cameras
observe retroreflective markers placed on the blades and tower of a wind
turbine. The image data is processed into 3d-coordinates of the marker
centres. From the calculated moving marker centres, e.g. flap, lead/lag
modes, eigenfrequencies, teeter motion and tower motion can be calculated
straightforward. We will present the flap angles of the blades of a rotating
wind turbine, which were determined with a frequency of 100 Hz and a standard
deviation of 0.1"o. The benefits of this optical method are: direct dynamic
and accurate measurement of blade and tower positions, no influence on flow
or turbine, no electrical connections, fast set-up and execution, applicable
to full scale turbines at low cost. 3 figs., 1 ref.
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