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Structural design and electrical properties of cantilever beam piezoelectric energy harvester by finite element analysis(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年6期
Page:
25-36
Research Field:
道路工程
Publishing date:

Info

Title:
Structural design and electrical properties of cantilever beam piezoelectric energy harvester by finite element analysis
Author(s):
LI Hui;  XU Long-zhou;  MAO Peng;  XIE Zheng-yang;  ZHAO Xin-bo;  WANG Zhen-jun
(School of Materials Science and Engineering, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
road engineering;  piezoelectric energy harvester;  finite element method;  cantilever beam;  energy harvesting road
PACS:
U416.22
DOI:
10.19721/j.cnki.1671-8879.2023.06.003
Abstract:
To explore the effects of structural parameters and piezoelectric materials on the electrical output performances of the piezoelectric energy harvester, the piezoelectric effect and the finite element simulation analysis method were employed. The initial structural model of the cantilever beam piezoelectric energy harvester was established, and the electrical output performance of different piezoelectric materials were analyzed, using the structural mechanics and AC/DC modules in COMSOL Multiphysics software. The results show that, according to the speed of the car on the road, it is concluded that the vibration frequency of the road is 6.67 to 13.33 Hz and will not reach20 Hz. The electrical output performance of the energy harvester using PZT-5H energy is the best in the road vibration frequency of 0 to 18 Hz, and the performance of PZT-5A is better in the range of 19 to 20 Hz. According to the actual vibration frequency range of the road surface, the piezoelectric material of PZT-5H is recommended. According to the output effect of electrical performance, the structure of the initial energy harvester is optimized, and the optimized structural parameters are obtained [the support structure size(length×width×height)is(1×20×1)mm3, the piezoelectric material size is(30×20×0.06)mm3, the metal substrate size is(30×20×0.1)mm3 and the mass block size is(4×20×1)mm3]. When the vibration frequency is 10 Hz and the vibration acceleration is 1g, the optimal external load of the cantilever piezoelectric energy harvester is 35 kΩ, and the corresponding output voltage and output power is 0.30 V and 1.24×10-6 W respectively, which is increased by 58% and 463% comparing to the output voltage(0.19 V)and output power(0.22×10-6 W)the initial structural. The characteristic frequency of the cantilever piezoelectric energy harvester was analyzed, and the calculated first-order characteristic frequency is 76.9 Hz. When the cantilever piezoelectric energy harvester works in the range of 0 to 20 Hz, the output voltage and output power increase with the increase of vibration frequency. At this time the working frequency is far away from the first order characteristic frequency, proving that the designed energy harvester model is reasonable in the range of road vibration frequency.4 tabs, 12 figs, 33 refs.

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Last Update: 2023-10-30