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Analysis and Simulation Study of Energy Harvesting from Vortex shedding-induced Vibrations Using the Piezoelectric Materials

Daraei, Aghil | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52325 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Tabeshpour, Mohammad Reza
  7. Abstract:
  8. Nowadays, energy harvesting from the sea is developing for a variety of applications, including small-scale technologies for the production of small amounts of energy, including the use of low-speed currents to power ocean floor sensors. Ocean floor sensors are currently working with batteries. The cost of replacing or recharging these batteries is high, and the technology of these conventional batteries does not keep up with the rapid development of these sensors. Using new energy harvesting technologies has made the ocean current harvesting system as an adequate replacement for the batteries. According to operating principles, energy harvester can be broadly classified into three general types of electromagnetic, electrostatic, and piezoelectric. In the present study, a suitable theoretical model for simulating this mechanism as well as determining the optimum position of the piezoelectric transducer in the vortex behind the solid object is presented. In the proposed mechanism, the piezoelectric elastic beam is subjected to a downstream of the cylinder vortex. And this beam is affected by the excitation force received from the vortex. The stresses and strains of the beam create electrical potential in the piezoelectric material and this electrical potential stored by an RC circuit connected to it. After analyzing the results, the effect of the distance scale between the cylinder and the piezoelectric beam on the electrical response has been studied. Moreover, the effect of resistive load, cylinder diameter, and fluid velocity on the power and voltage output of the converter has been investigated. And finally, for model validation, a numerical solution compared with the analytical solution
  9. Keywords:
  10. Sea Energy Harvesting ; Ocean Floor Sensors ; Vortex Shedding Vibrations ; Electric Response ; vortex Formation ; Charge Transfer Resistance ; Piezoelectric

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