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Design and Simulation of a Spar_Buoy Wave Energy Converter Using Piezoelectric Materials

Foroughi, Javad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53021 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Tabeshpour, Mohammad Reza; Abbaspour, Madjid
  7. Abstract:
  8. Nowdays, the world’s need for energy from renewable sources is increasing due to the excessive use of non - renewable resources and the pollution of the environment. Energy converters are classified into three general types: electromagnetic, electrostatic, and piezoelectric, in which piezoelectric materials are used in converters that convert mechanical energy into electrical energy (and vice versa). In the last decade there has been extensive research into the use of these materials for self-charging of low consumption electrically-powered devices such as sensors. For this purpose, in this study, a new method for harvesting electrical energy from the sea using piezoelectric elements is investigated. The proposed mechanism consists of a spar_buoy with cylindrical base with a number of connecting beams with piezoelectric patches attached to the end of the base in which playes the role of heave plate for the structure. The heave plate is under strain and stress by damping the oscillations of the structure and due to the reciprocal motion of the waves and currents, eventually creating electrical potential. The electrical energy produced is stored by the RC circuit. In the present study, in order to optimize the design of the present converter, the system was first modeled mathematically and the parameters related to the maximum output power were optimized. According to the results of mathematical modeling, the numerical model of the present system is simulated in STAR CCM + and COMSOL software. For numerical model validation, the numerical solution results are compared with the analytical solution results at each excitation frequency
  9. Keywords:
  10. Energy Conversion ; Piezoelectric Materials ; Heave Plate ; Cantilever Beam ; COMSOL Software ; Renewable Energy Resources ; Electric Response

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