Abstract
Piezoelectric vibration energy harvesting (PVEH) has been emerged as an alternative solution for sustainable powering to electronics. It has been well known that a PZT stack operating in 33-mode has higher mechanical to electrical energy conversion efficiency and higher mechanical reliability, compared to a cantilevered PZT bimorph operating in 31-mode. However, there are two challenges to improve the output performance of a PZT stack at a low frequency environment. First, the lower tensile strength of a PZT stack compared to the compressive strength makes it difficult to fully utilize maximum strain at harsh vibration conditions. Second, the relatively high stiffness of a PZT stack prevents being resonant with a base structure vibrating at a low frequency. To solve these challenges, this study thus proposes a double acting compression mechanism (DACM)-based PVEH stack operating in 33-mode. The DACM-based PVEH stack can convert mechanical vibration into elevated two-way compressive loading. The analytic model is used to investigate the electroelastic behaviors of the DACM-based PVEH device at given vibration conditions. The comparative study is performed to verify the effectiveness of the DACM-based PVEH stack over other mechanisms. It can be concluded that the DACM-based PVEH stack enables to generate higher power with the same volume of PZT using elevated two-way compressive loading.
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Abbreviations
- M :
-
Mass of a weight
- c :
-
Damping coefficient
- k :
-
Stiffness of a spring
- x :
-
Displacement of a damped single degree-of-freedom system
- y :
-
Displacement of base excitation
- X :
-
Maximum displacement
- Y :
-
Maximum displacement of base excitation
- ω :
-
Angular natural frequency
- ζ :
-
Damping ratio
- F T :
-
Maximum compressive load applied to a PZT stack
- r :
-
Frequency ratio
- S :
-
Strain
- T :
-
Stress
- E :
-
Elastic field
- D :
-
Electric displacement
- s E :
-
Elastic compliance at constant electric field
- d :
-
Piezoelectric coupling coefficient
- ε :
-
Dielectric permittivity
- x cs :
-
Displacement of a PZT stack
- h :
-
Thickness of a piezoelectric layer
- A cs :
-
Cross-sectional area
- F :
-
Actuation force to a PZT stack
- Q :
-
Electric charge
- V :
-
Output voltage
- n :
-
The number of piezoelectric layers
- L :
-
Length of a PZT stack
- P :
-
Output electric power
- R :
-
External electrical resistance
- C :
-
Capacitance
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Acknowledgements
This research was partially supported by the Main Project of Korea Institute of Machinery and Materials (Project Code: NK213E). This research was also supported by the National Research Council of Science & Technology (NST) grant by the Korea Government (MSIT) (No. CAP-17-04-KRISS).
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Jung, B.C., Yoon, H. Double Acting Compression Mechanism (DACM) for Piezoelectric Vibration Energy Harvesting in 33-Mode Operation. Int. J. of Precis. Eng. and Manuf.-Green Tech. 6, 681–690 (2019). https://doi.org/10.1007/s40684-019-00039-y
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DOI: https://doi.org/10.1007/s40684-019-00039-y