Cantilever-based piezoelectric energy harvester with improved frequency range
As the world progresses towards sustainable energy, piezoelectric energy harvesting system secures an escalating interest to shape up the idea of energy harvesting for applications and devices that require small fraction of power. The current shortcoming of piezoelectricity is its narrow operating f...
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| Format: | Thesis |
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2024
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| Summary: | As the world progresses towards sustainable energy, piezoelectric energy harvesting system secures an escalating interest to shape up the idea of energy harvesting for applications and devices that require small fraction of power. The current shortcoming of piezoelectricity is its narrow operating frequency bandwidth. This leads to it being only effective in limited circumstances. This study approached towards building a nexus between the variables of PEH and the outcome of the system using COMSOL Multiphysics. The study took a linear approach identifying the underlying sources to enhance the voltage and power outcome of the system. Moreover, an array model and a nonlinear model were designed and simulated to study the effects with a broader frequency range. The study showed conclusive remarks on the importance of cantilever beam configuration, piezoelectric materials, substrate materials, size and placement of the tip mass, multi-cantilever configuration and the gap between two permanent magnets on a nonlinear system. The study sufficiently proved the impact of the configuration of the PEH system to enhance the bandwidth frequency without including any external enhancement source. Configurations have shown a maximum 113.2% increase in voltage outcome compared to identical study performed in the past. Moreover, it showcased a maximum 60% increase in bandwidth by using aluminium in the configuration. The nonlinear method displayed a 92% increased bandwidth output in comparison of previously conducted experiments. The study provides a comparative analysis of the analytical model with regards to the simulated model and the previously established models. The outcome achieved from this study poses potential to pioneer to more enhanced applications and devices by using cantilever-based piezoelectric energy harvesters. |
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