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http://dx.doi.org/10.12989/was.2020.30.2.211

Dynamic behavior of smart material embedded wind turbine blade under actuated condition  

Mani, Yuvaraja (Department of Mechanical Engineering, PSG college of Technology)
Veeraragu, Jagadeesh (Department of Mechanical Engineering, PSG college of Technology)
Sangameshwar, S. (Department of Mechanical Engineering, PSG college of Technology)
Rangaswamy, Rudramoorthy (Department of Mechanical Engineering, PSG college of Technology)
Publication Information
Wind and Structures / v.30, no.2, 2020 , pp. 211-217 More about this Journal
Abstract
Vibrations of a wind turbine blade have a negative impact on its performance and result in failure of the blade, therefore an approach to effectively control vibration in turbine blades are sought by wind industry. The small domestic horizontal axis wind turbine blades induce flap wise (out-of-plane) vibration, due to varying wind speeds. These flap wise vibrations are transferred to the structure, which even causes catastrophic failure of the system. Shape memory alloys which possess physical property of variable stiffness across different phases are embedded into the composite blades for active vibration control. Previously Shape memory alloys have been used as actuators to change their angles and orientations in fighter jet blades but not used for active vibration control for wind turbine blades. In this work a GFRP blade embedded with Shape Memory Alloy (SMA) and tested for its vibrational and material damping characteristics, under martensitic and austenite conditions. The embedment portrays 47% reduction in displacement of blade, with respect to the conventional blade. An analytical model for the actuated smart blade is also proposed, which validates the harmonic response of the smart blade.
Keywords
wind turbine blade; smart blade; Ni-Ti alloy; actuation; Shape Memory Alloy (SMA);
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