# Modelling and design of highly coupled piezoelectric energy harvesters for broadband applications

## TL;DR

This paper presents a method for designing highly coupled piezoelectric energy harvesters with broadband capabilities through nonlinear electrical tuning, combining analytical and FEM modeling to optimize performance.

## Contribution

It introduces a novel design approach for broadband piezoelectric harvesters using nonlinear electrical techniques and optimization of a cantilever with PMN-PT patches.

## Key findings

- Achieved a strong electromechanical coupling of 17.6%.
- Demonstrated a bandwidth of 22% of the resonant frequency.
- Validated the design with a prototype exhibiting high performance.

## Abstract

This paper reports a method to design highly coupled piezoelectric energy harvesters with frequency tuning capabilities using nonlinear electrical techniques. A cantilever beam with two PMN-PT patches has been optimized thanks to both analytical modelling and Finite Element Methods (FEM). The built prototype exhibits a strong electromechanical coupling (k${}^2$=17.6%) and a figure of merit (km${}^2$Q=12.4) which allow a bandwidth corresponding to 22% of the resonant frequency value.

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Source: https://tomesphere.com/paper/1903.05861