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An Active Control of a Piezoelectric Energy Harvester for Energy Storage Optimization

Tavakkoli Anbarani, Mostafa | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47208 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Alasti, Aria; Salarieh, Hassan
  7. Abstract:
  8. Piezoelectric Energy Harvesters (PEH)’s are devices that by means of Piezoelectric effect, convert ambient vibrations directly into electricity.
    PEHs are often modeled as a cantilever beam with two piezoelectric layer attached to its sides. Due to their high energy density, small dimensions and adaptability to harsh environment, PEHs are referred to be a suitable substitute for batteries in the near future.
    In this study, a new design of PEH is introduced in which a piezoelectric actuator is placed within web of a PEH so that by applying appropriate voltage to it, the distance between the two flanges of the beam, and accordingly the moment of inertia of the beam, is adjusted such that always the resonance frequency of the beam matches that of ambient. According to the fact that the moment of inertia of the proposed beam is adjustable in the course of action, and in contrast to previous studies in which the design is unable to adjust itself to the ambient condition and therefore is unable to generate power in presence of ambient frequency uncertainty, the proposed design is recognized to control the PEH actively.
    In the end, the performance of the proposed design is compared to that of conventional design and it is witnessed that the proposed design can reach up to ten times the performance of the conventional design
  9. Keywords:
  10. Piezoelectric ; Active Control ; Energy Harvesting ; Microelectromechanical Systems (MEMS) ; Frequency Uncertainty

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