An energy harvester combining a piezoelectric cantilever and a single degree of freedom elastic system

This paper presents a type of vibration energy harvester combining a piezoelectric cantilever and a single degree of freedom （SDOF） elastic system. The main function of the additional SDOF elastic system is to magnify vibration displacement of the piezoelectric cantilever to improve the power output...

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Bibliographic Details
Published in:Journal of Zhejiang University. A. Science 2012-07, Vol.13 (7), p.526-537
Main Authors: Wang, Hong-yan, Shan, Xiao-biao, Xie, Tao
Format: Article
Language:English
Subjects:
Civil Engineering
Classical and Continuum Physics
Degrees of freedom
Elastic systems
Energy harvesting
Engineering
Finite element method
Harvesters
Industrial Chemistry/Chemical Engineering
Mathematical analysis
Mathematical models
Mechanical Engineering
Piezoelectricity
Vibration
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Summary:This paper presents a type of vibration energy harvester combining a piezoelectric cantilever and a single degree of freedom （SDOF） elastic system. The main function of the additional SDOF elastic system is to magnify vibration displacement of the piezoelectric cantilever to improve the power output. A mathematical model of the energy harvester is developed based on Hamilton＇s principle and Rayleigh-Ritz method. Furthermore, the effects of the structural parameters of the SDOF elastic system on the electromechanical outputs of the energy harvester are analyzed numerically. The accuracy of the output performance in the numerical solution is identified from the finite element method （FEM）. A good agreement is found between the numerical results and FEM results. The results show that the power output can be increased and the frequency bandwidth can be improved when the SDOF elastic system has a larger lumped mass and a smaller damping ratio. The numerical results also indicate that a matching load resistance under the short circuit resonance condition can obtain a higher current output, and so is more suitable for applica- tion to the piezoelectric energy harvester.
ISSN:1673-565X
1862-1775
DOI:10.1631/jzus.A1100344