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Title:
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Aero-elastic stability analysis tools for large wind turbine rotor blades
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Author(s):
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Published by:
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Publication date:
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ECN
Wind Energy
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1-8-2003
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ECN report number:
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Document type:
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ECN-RX--03-051
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Conference Paper
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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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Presented at: European Wind Energy Conference 2003, Madrid, Spain, 16-19 juni 2003.
Abstract:
Although modern large size wind turbines do not operate in stall, thetrends associated with scaling of dimensions reduce the stability of
edgewise blade vibrations. At ECN Wind Energy the aero-elastic vibrations
of rotor blades are investigated by participation in the research projects
STABTOOL, DAMPBLADE, and the ongoing STABCON project. The developments
within these projects have resulted in some aero-elastic stability analysis
codes.
The relatively simple but fast code BLADMODE can be used to investigate
modifications of the blade structure on the aero-elastic behaviour.
These investigations include 'Structural Pitch', which is a modification
of the direction of vibration realised by shifting the UD layers.
It was also shown that operation at high lift coefficients gives a reduced
damping of the edgewise vibrations because at high lift values, airfoils
show an increasing drag coefficient with angle of attack ('drag stall').
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