Modeling of Energy Harvesting Systems from Shell Structures<br/>

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Modeling of Energy Harvesting Systems from Shell Structures

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47575 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Sayyadi, Hassan
Abstract:
The electrical voltage, current and power output is calculated due to harmonic forced vibration of shell energy harvester. So five electromechanical equation together with Gauss equation is solved for doubly curve shell harvester in steady state condition in order to derive voltage, current and electric power output. The effect of shell curvature in cylindrical and spherical shells, the harvester series or parallel connection of layers and thickness of substrate and piezoelectric layer, is also considered in order to obtain maximum power output. The results show for small shell curvatures a high frequency load is needed to obtain maximum power and when the shell arc length is three times to radius of curvature the maximum power is delivered in cylindrical and spherical harvesters. Among possible connections of piezoelectric layers, series connection has more electric voltage output, while parallel connection has more current output. Consequently the effect of physical parameters consisting substrate and piezoelectric layer property is considered. Results show maximum power, when aluminum and PZT-5H is used as substrate and piezoelectric layer, respectively
Keywords:
Power Output ; Energy Harvesting ; Piezoelectric Shells ; Open and Short Circuit Resonance Frequency ; Electrical Capasitance

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