Journal
NANOMATERIALS
Volume 12, Issue 21, Pages -Publisher
MDPI
DOI: 10.3390/nano12213718
Keywords
piezoelectric; energy harvesting; L-shaped beam; U-shaped beam; bidirectional
Categories
Funding
- Shaanxi Province Natural Science Basic Research Project [2022JM-302]
- China National Postdoctoral Program for Innovative Talents [BX2021237]
- National Natural Science Foundation of China [U1909221]
- Chongqing Natural Science Basic Research Project [cstc2021jcyj-msxmX0801]
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This paper designs and compares two PVEHs of L-shaped beam and U-shaped beam through COMSOL simulation and prototype test. The proposed U-PVEH shows more advantages in low broadband and bidirectional vibration energy harvesting.
The traditional single degree of freedom linear piezoelectric vibration energy harvester (PVEH), such as the cantilever type, mainly works and resonates in a single direction and at a single frequency. To adapt broadband and bidirectional ambient vibration, this paper designs and compares two PVEHs of L-shaped beam and U-shaped beam through COMSOL simulation and prototype test. FEA modeling is introduced for accurate structure design with modal analysis, voltage frequency response analysis, and proof mass analysis with multiphysics electromechanical coupling simulation. Two PVEH prototypes with different gravity angles and clamping angles are tested at 0.1 g acceleration to find the optimal angle for maximum output power. The best clamping angle of L-PVEH is 135 degrees with RMS power of 0.3 mW at 7.9 Hz, and that of U-PVEH is 45 degrees with RMS power of 0.4 mW at 5.0 Hz. The proposed U-PVEH shows more advantages in low broadband and bidirectional vibration energy harvesting.
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