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Broadband Piezoelectric Energy Harvester Based on Coupling Resonance Frequency Tuning
1Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Micromachines
|January 21, 2023
Summary
This study introduces a novel coupling tuning mechanism using effective electrode coverage to broaden the bandwidth of piezoelectric energy harvesters (PEHs). This method enhances both bandwidth and average power output for improved energy harvesting.
Area of Science:
- Materials Science
- Electrical Engineering
- Energy Harvesting
Background:
- Piezoelectric energy harvesters (PEHs) offer a sustainable power source.
- Broadening the bandwidth of PEHs is crucial for efficient energy harvesting across various frequencies.
- Existing methods like mechanical and electrical tuning have limitations.
Purpose of the Study:
- To present a new coupling tuning mechanism for regulating the resonance frequency of PEHs.
- To investigate the effect of effective electrode coverage (EEC) on PEH performance.
- To validate the proposed tuning mechanism through theoretical analysis and experimental testing.
Main Methods:
- Developed a linear model of a bimorph piezoelectric cantilever with segmented electrodes.
- Evaluated power harvesting behavior by varying EEC from 0 to 100%.
- Constructed and tested two cantilever PEHs using PZT and PZT-PT materials.
Main Results:
- Theoretical analysis showed a positive correlation between EEC and near-open-circuit resonance frequency.
- Experimental results demonstrated significant improvements in bandwidth and average power.
- The coupling tuning method effectively enhanced PEH performance.
Conclusions:
- The proposed coupling tuning mechanism based on EEC is effective for broadening PEH bandwidth.
- Further improvements in bandwidth can be achieved using advanced piezoelectric materials and optimized design parameters.
- This research contributes to the advancement of efficient piezoelectric energy harvesting technologies.
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