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Providing Optimization Tools to Design Aeroelastic Blades of Wind Turbines Made of Curved Fibers

Feiz Arefi, Morteza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49176 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Haddadpour, Hassan
  7. Abstract:
  8. Nowadays Aeroelasticity is one of most important branch of aerospace science. The Aeroelastic analysis and get on aeroelastic safety margin, is one of the major steps that must be taken in flying crafts design. Diverse software have been developed for this purpose. Due to the increasing the demands of use of composite materials in aircraft structures, need to examine the effect of various parameters such as angles and stacking sequence on the aeroelastic instability (flutter and divergence) composite aircraft structures is determined. The analysis of wind turbines as a means of extracting energy from the wind and having a large diameter blades, causing the interference effects of aerodynamic and structural is therefore essential. In this study, the efficiency of variable stiffness using curved fibers in a rotating cracked thin-walled beam clamped has been investigated. The blade has a closed rectangular cross section and made of composite materials which have layers of elastic orthotropic material. In this model the effects of shear deformations, primary and secondary warping is considered. The governing equations are derived using the extended Hamilton's principle and are solved by Galerkin method. In this thesis for the first time the curved fibers in the composite rotating thin-walled beams has been used and optimize it by Sequential Quadratic Programming with actions indicating the curvature of the fiber to make it possible to do so. To evaluate the optimization code, optimization problem has been formulated for the principle natural frequency, which is one of the aspects of innovation of this research
  9. Keywords:
  10. Aeroelasticity ; Thin Walled Beam ; Wind Turbine ; Composite Materials ; Unsteady Aerodynamic ; Variable Stiffness Spring ; Curved Fiber

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