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

doi:10.1007/s10483-019-2542-5

Abstract

Abstract: 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 μW 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, lowfrequency, broad-bandwidth

2010 MSC Number:

74S05

Dongxing CAO, Wei XIA, Wenhua HU. Low-frequency and broadband vibration energy harvester driven by mechanical impact based on layer-separated piezoelectric beam. Applied Mathematics and Mechanics (English Edition), 2019, 40(12): 1777-1790.

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