Load mitigation of wind turbine blade by aeroelastic tailoring via unbalanced laminates composites

Title
Load mitigation of wind turbine blade by aeroelastic tailoring via unbalanced laminates composites
Authors
하성규
Keywords
Bend-twist coupling; Ply-thickness unbalance; Fatigue load reduction; Collective-pitch demand
Issue Date
2015-09
Publisher
ELSEVIER SCI LTD
Citation
COMPOSITE STRUCTURES, v. 128, Page. 122-133
Abstract
The parametric study of unbalanced tri-axial non-crimp fabrics laminates, typically used in the blade skin layup, showed that the highest bend-twist coupling up to 0.56 was achieved when all three kinds of unbalances (i.e. ply-angle, ply-material and ply-thickness unbalances) were simultaneously present in the laminates. Based on aeroelastic tailoring via unbalanced laminates, the bend-twist coupling towards feather of various degrees was implanted to the skin layup of a variable-speed collective-pitch controlled 5 MW wind turbine rotor blades and fully-coupled aero-servo-elastic analyses were performed. The results showed that when the ply-thickness unbalance is added in the skin layup, in addition to already existing ply-angle and ply-material unbalances, an average increase in the coupling magnitude by approximately 51% along the blade length and a reduction in fatigue load and collective-pitch demand by approximately 1.6-2.9% and 5.5-19.9% across the range of applied stochastic winds ranging from 7 m/s to 23 m/s. (C) 2015 Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0263822315002159http://hdl.handle.net/20.500.11754/27500
ISSN
0263-8223; 1879-1085
DOI
http://dx.doi.org/10.1016/j.compstruct.2015.03.042
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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