Load mitigation of wind turbine blade by aeroelastic tailoring via unbalanced laminates composites
- Authors
- Hayat, Khazar; Ha, Sung Kyu
- Issue Date
- Sep-2015
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Bend-twist coupling; Ply-thickness unbalance; Fatigue load reduction; Collective-pitch demand
- Citation
- Composite Structures, v.128, pp.122 - 133
- Indexed
- SCIE
SCOPUS
- Journal Title
- Composite Structures
- Volume
- 128
- Start Page
- 122
- End Page
- 133
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/24882
- DOI
- 10.1016/j.compstruct.2015.03.042
- ISSN
- 0263-8223
- 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.
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