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Optimization of cantilevered piezoelectric energy harvester with a fixed resonance frequency

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Abstract

Piezoelectric energy harvesting is widely used to scavenge vibration energy in the environment. For some vibration sources with fixed frequency, cantilevered harvester can generate the energy effectively, so the optimization theory for cantilevered harvester in such an application is needed. In this article, we present the theoretical and experimental studies of the cantilevered piezoelectric energy harvester with a fixed resonance frequency. An analytical model based on energy method is used to estimate the open-circuit voltage and generated energy. Considering that the harvester may be subjected to the static force or steady-state sinusoidal vibration excitation, static and dynamic analysis is performed for device structure to achieve efficient energy. In the analysis, the effects of geometrical dimension on the energy harvesting performance are discussed comprehensively. Eventually, a prototype is designed and fabricated using (1−x)Pb(Mg1/3Nb2/3)O3−x PbTiO3 (PMN-PT) single crystal with ultrahigh piezoelectric properties and coupling factor. Performances of the cantilever with different clamped length are evaluated under sinusoidal vibration excitation, proving the good consistency between experimental results and theoretical prediction. The established analysis can provide useful guidelines for the structure design of cantilevered piezoelectric energy harvester with a fixed resonance frequency.

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Authors and Affiliations

  1. Key Laboratory of Inorganic Functional Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201800, China

    Zhu Liang, ChunDong Xu, Bo Ren, WenNing Di, Long Li & HaoSu Luo

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Zhu Liang, ChunDong Xu & Long Li

  3. Shibei Power Supply Branch, Shanghai Municipal Electric Power Company, Shanghai, 200072, China

    Zhen Chen & Jun Su

Authors
  1. Zhu Liang
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  2. ChunDong Xu
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  3. Bo Ren
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  4. WenNing Di
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  5. Long Li
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  6. HaoSu Luo
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  7. Zhen Chen
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  8. Jun Su
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Correspondence to HaoSu Luo.

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Liang, Z., Xu, C., Ren, B. et al. Optimization of cantilevered piezoelectric energy harvester with a fixed resonance frequency. Sci. China Technol. Sci. 57, 1093–1100 (2014). https://doi.org/10.1007/s11431-014-5556-7

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  • DOI: https://doi.org/10.1007/s11431-014-5556-7

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