Abstract
This paper reports on the theory and experimental verification of utilising air damping as a soft stopper mechanism for piezoelectric vibration energy harvesting to enhance shock resistance. Experiments to characterise device responsiveness under various vibration conditions were performed at different air pressure levels, and a dimensionless model was constructed with nonlinear damping terms included to model PVEH response. The relationship between the quadratic damping coefficient ζn and air pressure is empirically established, and an optimal pressure level is calculated to trade off harvestable energy and device robustness for specific environmental conditions.
Highlights
Microelectromechanical systems (MEMS) technology has enabled the construction of chipscale vibration energy harvesters with the potential for close in-package or monolithic co-integration with standard CMOS technology
Nonlinear air damping has been observed by Jia et al [3] when the PVEH operates under atmospheric conditions, which limits the maximum displacement of the PVEH when subjected to large amplitude excitation
Conclusion and Future work While vacuum packaging is typically used in MEMS applications to minimise air damping, this paper presents a novel application of utilising air damping as a soft stopper for PVEHs
Summary
Shao-Tuan; Du, Sijun; Arroyo, Emmanuelle; Jia, Yu; Seshia, Ashwin A. Utilising nonlinear air damping as a soft mechanical stopper for MEMS vibration energy harvesting.
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