Improving Power Density of Piezoelectric Vibration-Based Energy Scavengers

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  • R Hosseini*1,
  • O Zargar2,
  • M Hamedi3,
  1. Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran
  2. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
  3. Department of Mechanical Engineering, Faculty of Engineering, University of Tehran, Iran

Revised: 2017-09-27

Accepted: 2017-12-14

Published in Issue 2018-03-01

How to Cite

Hosseini, R., Zargar, O., & Hamedi, M. (2018). Improving Power Density of Piezoelectric Vibration-Based Energy Scavengers. Journal of Solid Mechanics, 10(1), 98-109. https://oiccpress.com/jsm/article/view/12039

PDF views: 215

Abstract

Vibration energy harvesting with piezoelectric materials currently generate up to 300 microwatts per cm2, using it to be mooted as an appropriate method of energy harvesting for powering low-power electronics. One of the important problems in bimorph piezoelectric energy harvesting is the generation of the highest power with the lowest weight. In this paper the effect of the shape and geometry of a bimorph piezoelectric cantilever beam harvester on the electromechanical efficiency of the system is studied. An analytic model has been presented using Rayleigh cantilever beam approximations for piezoelectric harvesters with tapered bimorph piezoelectric cantilever beam. In order to study the effect of a cantilever beam length and geometry on the generated voltage, finite element simulation has been performed using ABAQUS. Design optimization has been used to obtain the maximum output power and tapered beams are observed to lead to more uniform distribution of strain in the piezoelectric layer, thus increasing efficiency.
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