Effect of Weight on the Resonant Tuning of Energy Harvesting Devices Using Giant Magnetostrictive Materials.

Kotaro Mori,Tadashi Horibe,Shigekazu Ishikawa

doi:10.3390/ma11040581

Kotaro Mori, Tadashi Horibe + Show 1 more

Open Access

https://doi.org/10.3390/ma11040581

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Journal: Materials	Publication Date: Apr 10, 2018
Citations: 5	License type: CC BY 4.0

Affiliation: Ibaraki University, Hitachi (Japan)

Abstract

This study deals with the numerical and experimental study of the effect of weight on the resonant tuning and energy harvesting characteristics of energy harvesting devices using giant magnetostrictive materials. The energy harvesting device is made in a cantilever shape using a thin Terfenol-D layer, stainless steel (SUS) layer and a movable proof mass, among other things. In this study, two types of movable proof mass were prepared, and the device was designed to adjust its own resonant frequency automatically to match external vibration frequency in real time. Three-dimensional finite element analysis (FEA) was performed, and the resonant frequency, tip displacement, and output voltage in the devices were predicted and measured, and the simulation and experiment results were compared. The effects of the weight of the proof mass on self-tuning ability and time-varying behavior were then considered in particular.

Highlights

Magnetostrictive materials show elongation or contraction under external magnetic fields, and the magnetization changes in connection with applied forces [1,2]
In order to clarify the capability of increasing the output voltage through self-tuning, we investigated the physical phenomenon of proof mass movement with different external frequencies
The resonant frequency was found to depend on the weight and location of the movable proof mass

Summary

Introduction

Magnetostrictive materials show elongation or contraction under external magnetic fields, and the magnetization changes in connection with applied forces [1,2]. Magnetostrictive materials have been mainly used as sensors and actuators because of their suitable properties, such as high energy density, quick response and the possibility of remote operation. The use of these materials for energy harvesting has gained the interest of researchers, and some results in this regard have been reported [6,7]. Energy harvesting is defined as the conversion of the ambient energy present in the environment into usable electrical energy and is expected to be employed as the power source for devices, such as. Devices for vibration energy harvesting are anticipated to be a substitute for battery-powered systems. Their lifetime is generally several times that of a battery, and they are a tempting substitute in vibration-rich environments

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