Theoretical modeling of piezoelectric energy harvesting in the system using technical textile as a support

Abstract

An approach to harvesting electrical energy from a mechanically excited piezoelectric element has been described. The topic of this paper studies the most important properties of piezoelectric polymer polyvinylidene fluoride (PVDF) in energy harvesting. We have chosen to develop a recovery application within the clothes. By the use of a piezoelectric energy harvester capable to convert the mechanical energy produced by the knee during walking to an electrical energy. This will be achieved by replacing the traditional textile of the kneepad with the one that is made of the technical textile based on acrylic knitted and PVDF as a patch stuck on the textile. Furthermore, PVDF has many unique features, such as excellent mechanical behavior, large strain without structure fatigue, which enables it to act strongly as the load bearing member, and corrosion resistance. The technical textile, functioning as multifunctional wearable human interfaces, is considered today as a useful tool in several energy fields. In this paper, a smart structure based on piezoelectric polymer (PVDF) has been presented, which a power analytical model, based on the frequency, the geometrical parameters and other factors were investigated. Furthermore, the set of numerical results illustrating the harvested power for a given size of the device has been performed and discussed and how this harvested power may be used as a source for a wearable device. Finally, the theory presented in this study can be used for the realization of other optimal designs, for a wearable sensor with low consumption and so on.

Mathematical modeling of mass spring’s system: Hybrid speed bumps application for mechanical energy harvesting

“…The purpose of our second subsystem is to create a current generated by the piezoelectric material to supply a purely resistive load, in our case, it is a sensor. The passage of vehicles on the speed bump will produce mechanical power that is going to be converted into electrical power using PVDF (Rajala & Lekkala, 2012;Chakhchaoui et al, 2017;Rajala & Lekkala, 2010;Ennawaoui et al, 2018b) material and a converter based on an electronic circuit designed to have a current going to be stored in a battery or supply directly a wireless sensor and make it energy independent.…”

Improvement in energy conversion of electrostrictive composite materials by new approach via piezoelectric effect: Modeling and experiments

“…15,16 At the current time, the category of electroactive material known as electrostrictive polymer has shown great potential for a variety of advanced applications 5,17 and maybe well appropriate for harvesting energy from vibration sources. [18][19][20][21][22][23][24][25] However, the electromechanical conversion efficiency increasing of electrostrictive polymer is reduced by the high value of polarization power. 21 To address this problem, many studies have been conducted on electrostrictive polymers to predict their energy recovery abilities.…”

“…They are usually used as actuators for artificial muscles, in robotics or mechatronics 15,16 . At the current time, the category of electroactive material known as electrostrictive polymer has shown great potential for a variety of advanced applications 5,17 and maybe well appropriate for harvesting energy from vibration sources 18‐25 . However, the electromechanical conversion efficiency increasing of electrostrictive polymer is reduced by the high value of polarization power 21 .…”

β‐Polymorph enhancement in poly(vinylidene fluoride) by blending with polyamide 6 and barium titanate nanoparticles

“…[3,4] Piezoelectric energy harvesting devices using PVDF films were also reported recently. [5][6][7] PVDF as a semi-crystalline material exhibits five crystalline phases (α, β, γ, δ, and ε) with α and β crystals being the most common polymorphs. The α phase with TGTG 0 (trans-gauche) conformation is the most dominant form owing to its thermodynamically stable nature, while the β phase with TTTT (all trans) conformation is the most technologically desirable polymorph due to its electroactive properties.…”