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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2012, Vol. 13 Issue (7): 526-537    DOI: 10.1631/jzus.A1100344
Mechanical Engineering     
An energy harvester combining a piezoelectric cantilever and a single degree of freedom elastic system
Hong-yan Wang, Xiao-biao Shan, Tao Xie
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China; College of Computer and Control Engineering, Qiqihar University, Qiqihar 161006, China
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Abstract  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 application to the piezoelectric energy harvester.

Key wordsPiezoelectric cantilever      Single degree of freedom elastic (SDOF) system      Energy harvesting      Finite element analysis (FEA)     
Received: 17 December 2011      Published: 03 July 2012
CLC:  TM619  
  TN384  
Cite this article:

Hong-yan Wang, Xiao-biao Shan, Tao Xie. An energy harvester combining a piezoelectric cantilever and a single degree of freedom elastic system. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2012, 13(7): 526-537.

URL:

http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1100344     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2012/V13/I7/526

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