Abstract
This letter reports a piezoelectric vibration energy harvester which energy conversion efficiency is significantly improved by arraying piezoelectric sheets on cantilever beams, and the operation frequency band is widened by applying two‐segment cantilever beams. A prototype is developed and tested. In this case, two group piezoelectric arrays are combined on the cantilever beams with the optimum load resistance. The total output power remains above 6.54 mW within the operation frequency band ranges from 27.5 Hz to 37.5 Hz when the generator is under an acceleration of 0.7 g and reaches two power peaks: 20.5 mW at 29.2 Hz and 12.95 mW at 35.4 Hz.
Highlights
With the rapid development of the applications of wireless sensor networks, particular in some low-power conditions, wireless sensors with the function of converting the energy in the environment into electric energy are much desired
It can be seen from equations (14) and (15) that when other parameters are determined, the output power of the piezoelectric vibration energy harvester is related to the excitation frequency after matching the optimal load, and when the system is in the resonant frequency region, it can obtain larger output power
For comparison between the proposed CVEH of narrow-width piezoelectric arrays (Figure 10(a)) and a traditional large-width piezoelectric structure named T-vibration energy harvester (VEH) shown in Figure 10(b), experiment on a traditional nonarray piezoelectric cantilever vibration energy harvester (T-VEH) with the width of piezoelectric sheet on its primary beam is the sum of the widths of the two piezoelectric sheets on cantilever beam piezoelectric vibration energy harvester (C-VEH) primary beam and the width of the piezoelectric sheet on its secondary beam is the sum of the widths of those on the C-VEH secondary beam is conducted
Summary
With the rapid development of the applications of wireless sensor networks, particular in some low-power conditions, wireless sensors with the function of converting the energy in the environment into electric energy are much desired. (i) Designing a two-segment cantilever beam piezoelectric vibration energy harvester (C-VEH) based on array arrangement of piezoelectric patches on the beam for improving the energy harvesting efficiency and working frequency bandwidth of the piezoelectric energy harvesting structure (ii) Establishing the electromechanical conversion analysis model and its control equation under the influence of load coupling of piezoelectric composite cantilever vibration energy harvester and deducting the mathematical models of its output voltage and output power for analyzing the performance of piezoelectric vibration energy acquisition structure accurately (iii) Analyzing the energy harvesting performance of CVEH experimentally and compared with the traditional nonarray piezoelectric cantilever vibration energy harvester (T-VEH).
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