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Investigation of Energy Harvesting from a Fluttering Plate in Subsonic Flow via Piezoelectric Materials

Delshad Noughabi, Mohsen | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48471 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Dehghani Firoozabadi, Rouhollah
  7. Abstract:
  8. One can use the vibrational energy available in environment to harvest energy via piezoelectric materials, for various applications and this research field has received growing attention by researchers over the last years. This research motivation is, harvesting electrical energy from a fluttering plate in 2D axial flow via piezoelectric materials. For this purpose, a nonlinear Euler-Bernoulli beam model is used to model structure, an incompressible 2D vortex lattice method is used to model the aerodynamics, and coupled linear piezoelectric electro-mechanical equations is used to model piezoelectric materials. The structure is considered into axial flow, and flow speed gradually increases, and at a critical flow speed, system is going to unstable and undergoes flutter. Because of nonlinear structural effects, at speeds beyond the flutter speed, the structure undergoes limit cycle oscillations (LCOs) with limited amplitude. When flow speed increases more, amplitude and frequency of LCOs increase. Also one can see when flow speed increases, frequency of LCOs get closer to the second natural frequency of the structure and the vibrational mode of LCOs become more similar to the second mode shape of the structure. In this study, energy is harvested by using LCOs at speeds beyond the flutter speed. For this purpose a pinned-free beam with a torsional spring is considered and showed that minimum flutter speed occurs not only in a pinned-free beam but also in a pinned-free beam with a specific torsional spring constant. This result can be used to optimize an aeroelastic energy harvester. Then, effect of energy harvesting on the flutter characteristics is studied. After that, effect of boundary condition on harvested voltage is explained. Then effect of other factors like cancellation and series and parallel connection of piezoelectric layers is studied
  9. Keywords:
  10. Aeroelasticity ; Piezoelectric ; Energy Production ; Modal Analysis ; Vortex Lattice Method ; Subsonic Flow

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