Optimization of energy harvesting based on the uniform deformation of piezoelectric ceramic

Abstract

Since the piezoelectric properties were used for energy harvesting, almost all forms of energy harvester needs to be bonded with a mass block to achieve pre-stress. In this article, disc type piezoelectric energy harvester is chosen as the research object and the relationship between mass bonding area and power output is studied. It is found that if the bonding area is changed as curved, which is usually complanate in previous studies, the deformation of the circular piezoelectric ceramic is more uniform and the power output is enhanced. In order to test the change of the deformation, we spray several homocentric annular electrodes on the surface of a piece of bare piezoelectric ceramic and the output of each electrode is tested. Through this optimization method, the power output is enhanced to more than 11[Formula: see text]mW for a matching load about 24[Formula: see text]k[Formula: see text] and a tip mass of 30[Formula: see text]g at its resonant frequency of 139[Formula: see text]Hz.

Energy Harvesting Research: The Road from Single Source to Multisource

“…For instance, a pressure energy harvester made with prestressed piezoelectric discs has provided an output power density of >10 mW cm −3 which is the record for the energy harvesters made of piezoelectric ceramics, especially for conventional PZT . There are many publications available for the topic of prestressed piezoelectric energy harvesters …”

Particle swarm approach to the optimisation of trenched cantilever‐based MEMS piezoelectric energy harvesters

“…Most of the works with the title of optimisation with the aim of generating maximum possible power have not used optimisation algorithms to compromise between structural parameters but commonly have changed some parameters and have reached a larger power than before. Some of the attempts seeking the optimum structures are as follows: changing the radius of the annular electrodes of a circular piezoelectric [19], finding the best piezoelectric transducer length and cross-section independently [20], observing the variations of the structural parameters while keeping the resonance frequency constant [21], investigating the effect of the different substrate thicknesses [4], finding the best substrate to piezoelectric thickness ratio [22], discussing different length, width and thickness for triangular beam array [23] and installing the lead zirconate titanate (PZT) layers at the fixed, middle and free end of the substrate [24].…”

A Single‐Material Multi‐Source Energy Harvester, Multifunctional Sensor, and Integrated Harvester–Sensor System—Demonstration of Concept

“…These were not the optimized results. Previous work [31,[41][42][43][44][45][46] has shown that potential improvement can be made. Here, however, the focus was on the demonstration of the add-on effects to be gained from multi-source energy conversion.…”