Applied Mathematics and Mechanics

, Volume 40, Issue 12, pp 1777–1790 | Cite as

Low-frequency and broadband vibration energy harvester driven by mechanical impact based on layer-separated piezoelectric beam

  • Dongxing CaoEmail author
  • Wei Xia
  • Wenhua Hu
Open Access


Vibration energy harvesting is to transform the ambient mechanical energy to electricity. How to reduce the resonance frequency and improve the conversion efficiency is very important. In this paper, a layer-separated piezoelectric cantilever beam is proposed for the vibration energy harvester (VEH) for low-frequency and wide-bandwidth operation, which can transform the mechanical impact energy to electric energy. First, the electromechanical coupling equation is obtained by the Euler-Bernoulli beam theory. Based on the average method, the approximate analytical solution is derived and the voltage response is obtained. Furthermore, the physical prototype is fabricated, and the vibration experiment is conducted to validate the theoretical principle. The experimental results show that the maximum power of 0.445 □W of the layer-separated VEH is about 3.11 times higher than that of the non-impact harvester when the excitation acceleration is 0.2 g. The operating frequency bandwidth can be widened by increasing the stiffness of the fundamental layer and decreasing the gap distance of the system. But the increasing of operating frequency bandwidth comes at the cost of reducing peak voltage. The theoretical simulation and the experimental results demonstrate good agreement which indicates that the proposed impact-driving VEH device has advantages for low-frequency and wide-bandwidth. The high performance provides great prospect to scavenge the vibration energy in environment.

Key words

vibration energy harvester (VEH) layer-separated piezoelectric beam low-frequency broad-bandwidth 

Chinese Library Classification


2010 Mathematics Subject Classification



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Authors and Affiliations

  1. 1.College of Mechanical EngineeringBeijing University of TechnologyBeijingChina
  2. 2.Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical StructuresBeijingChina
  3. 3.School of Mechanical EngineeringTianjin University of TechnologyTianjinChina

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