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The synergy of I-beam inspiration and auxeticity: a route to superior performance in piezoelectric energy harvesters at low-frequency
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DOI：10.1088/1361-665X/ae60b7.png)
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Abstract
En 中文
Vibration energy harvesting devices are intrinsically linked to environmental vibration intensity in practical applications. This study proposes a composite negative Poisson’s ratio piezoelectric energy harvester inspired by I-beam structures, designed to achieve high energy conversion efficiency under low-frequency vibration conditions. Surface functional zoning is achieved through optimized structures and shapes, causing significant changes in the distribution and magnitude of surface displacement during bending deformation, thereby effectively unifying low resonance frequency, high output power, and excellent durability. Concurrently, the key piezoelectric properties of the composite model were also analyzed through finite element simulation. An overview of the vibration testing, impact testing, and continuous vibration testing at resonance frequency reveals that the optimal model exhibits a 36% improvement in impact electrical response compared to uniform Poisson’s ratio piezoelectric energy harvesters, and the overall power output per unit area increased by 145%. The long-term output voltage variation curve under resonant frequency reveals its outstanding durability performance and repeatable excitation characteristics, with an effective cycle count of up to 50 000 times. This research offers configuration approaches for low-frequency energy harvesting, with the potential to realize vibration energy collection in fields such as roads and bridges.
Keywords:
Piezoelectric energy harvester
Negative Poisson’s ratio
I-beam structure
Low-frequency vibration
Energy conversion efficiency
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