scholarly journals Design and Evaluation of a Piezoelectric Energy Harvester Produced with a Finite Element Method

2010 ◽  
Vol 11 (5) ◽  
pp. 206-211 ◽  
Author(s):  
Chul-Min Kim ◽  
Chang-Il Kim ◽  
Joo-Hee Lee ◽  
Jong-Hoo Paik ◽  
Jeong-Ho Cho ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Energy Harvester ◽  
Piezoelectric Energy ◽  
Element Method

Evaluation and Validation of a Multiphysics Finite Element Model for a Piezoelectric Energy Harvester

2021 ◽  
Author(s):  
Andrew Melro ◽  
Kefu Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Model ◽  
Energy Harvester ◽  
Proof Mass ◽  
Experimental Testing ◽  
Element Model ◽  
Load Resistance ◽  
Piezoelectric Energy ◽  
The Finite Element Model

This paper explores the applicability of using the multiphysics finite element method to model a piezoelectric energy harvester. The piezoelectric energy harvester under consideration consists of a stainless-steel cantilever beam attached by a piezoelectric ceramic patch. Two configurations are considered: one without a proof mass and one with a proof mass. Comsol Multiphysics software is used to simultaneously model three physics: the solid mechanics, the electrostatics, and the electrical circuit physics. Several key relationships are investigated to predict the behaviours of the piezoelectric energy harvester. The effects of the electrical load resistance and a proof mass on the performance of a piezoelectric energy harvester are evaluated. Experimental testing is conducted to validate the results found by the finite element model. Overall, the results from the finite element model closely match those from the experimental testing. It is found that increasing the load resistance of the piezoelectric energy harvester causes an increase in voltage across the load resistor, and matching the impedance yields the maximum power output. Increasing the proof mass reduces the fundamental frequency that results in an increase of the displacement transmissibility and the impedance matched resistance. The study shows that the multiphysics finite element method is effective to model piezoelectric energy harvesters.

Modal reduction-based finite element method for nonlinear FG piezoelectric energy harvesters

2021 ◽  
pp. 107754632110481
Author(s):  
Parisa Fatehi ◽  
Mojtaba Mahzoon ◽  
Mehrdad Farid ◽  
Hassan Parandvar
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Initial Conditions ◽  
Geometrical Nonlinearity ◽  
Polymer Materials ◽  
Computational Time ◽  
Accurate Estimation ◽  
Piezoelectric Energy ◽  
Modal Reduction ◽  
Element Method

In this study, harvesting energy from a nonlinear functionally graded (FG) piezoelectric cantilever beam under harmonic excitation is investigated. The material properties of the piezoelectric are assumed to be a combination of piezo-ceramic and piezo-polymer materials for high performance and flexibility. The neutral axis is obtained in order to eliminate bending–stretching coupling. The geometrical nonlinearity and electromechanical coupling are incorporated in the coupled nonlinear equations that are derived using the generalized Hamilton’s principle and solved using the combination of modal reduction and finite element methods. The shooting method is employed to obtain steady-state periodic response of an FG nonlinear harvester with appropriate initial conditions. Also it is shown that at least two-mode approximation is required for accurate estimation of nonlinear response and harvested power. Using the method of nonlinear modal reduction, the unstable branches for frequency domain solution are estimated and the computational time is reduced considerably compared to full finite element method. A case study is also accomplished in detail to analyze the effects of base amplitude values and material distribution on harvested power and bandwidth.

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