Double Acting Compression Mechanism (DACM) for Piezoelectric Vibration Energy Harvesting in 33-Mode Operation
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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.
KeywordsPiezoelectric vibration energy harvesting PZT stack 33-Mode Double acting compression mechanism
List of Symbols
Mass of a weight
Stiffness of a spring
Displacement of a damped single degree-of-freedom system
Displacement of base excitation
Maximum displacement of base excitation
Angular natural frequency
Maximum compressive load applied to a PZT stack
Elastic compliance at constant electric field
Piezoelectric coupling coefficient
Displacement of a PZT stack
Thickness of a piezoelectric layer
Actuation force to a PZT stack
The number of piezoelectric layers
Length of a PZT stack
Output electric power
External electrical resistance
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).
- 1.Kim, J. E., Kim, H., Yoon, H., Kim, Y. Y., & Youn, B. D. (2015). An energy conversion model for cantilevered piezoelectric vibration energy harvesters using only measurable parameters. International Journal of Precision Engineering and Manufacturing-Green Technology, 2(1), 51–57.CrossRefGoogle Scholar
- 18.Xu, T., Siochi, E. J., Kang, J. H., Zuo, Lei, Zhou, W., Tang, X., & Jiang, X. (2011) A Piezoelectric PZT ceramic Multilayer Stack for Energy Harvesting under Dynamic Forces. In: Proceedings of the ASME 2011 International Design Engineering Technical Conference and Computers and Information in Engineering Conference. Google Scholar
- 24.Zhao, S. (2013). Energy harvesting from random vibrations of piezoelectric cantilevers and stacks. PhD thesis, Georgia Institute of Technology.Google Scholar
- 25.Morgan Advanced Materials website. http://www.morgantechnicalceramics.com. Accessed 1 Feb 2019.
- 26.PIECO.COM website. https://piezo.com. Accessed 1 Feb 2019.
- 28.Inman, D. J. (2013). Engineering vibration (4th ed.). Pearson Education, Inc., Upper Saddle River, NJ.Google Scholar