Abstract
In vibration-based piezoelectric energy harvesters, one of the major critical issues is increasing the bandwidth and output voltage simultaneously. This manuscript explores a new technique for broadening the operating frequency range and enhancing the output voltage of the piezoelectric material-based energy harvester by appropriate structural tailoring. The wide bandwidth and the improvement in harvested output are accomplished by means of a multi-stepped cantilever beam shaped with rectangular cavities. The harvester is mathematically modeled and analyzed for modal characteristics. It was demonstrated from the outcome that the first two consecutive mode frequencies could be brought closer and the output power was large at both the resonant frequencies compared to the regular cantilever beam energy harvester. The results obtained from experimentation were in agreement with analytical results.
Highlights
In the last decade, researchers in all disciplines have evoked great interest in harvesting energy from ambient sources, which were otherwise unutilized
Vibration can be used to source wireless sensor systems and researchers across the world are working towards its possible use in industrial condition monitoring systems, medical implants, and smart clothing
To improve the bandwidth and output simultaneously, a new broadband piezoelectric energy harvester designed using a multi-stepped cantilever beam shaped with rectangular cavities is proposed, which is the first research report of its kind
Summary
Researchers in all disciplines have evoked great interest in harvesting energy from ambient sources, which were otherwise unutilized. Piezoelectric broadband energy harvesters having a propped cantilever beam with variable overhang length as host structure was proposed in References [20,21,22,23] to get high output over a wide range of operating frequencies. To improve the bandwidth and output simultaneously, a new broadband piezoelectric energy harvester designed using a multi-stepped cantilever beam shaped with rectangular cavities is proposed, which is the first research report of its kind. It has adjacent first two-mode frequencies with an enhanced output in both modes. This was proven through both an analytical model and an experimental test
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