A piezoelectric energy harvester for human body motion subjected to two different transversal reciprocating excitations

IF 1 4区工程技术 Q4 ENGINEERING, MECHANICAL

Mechanical Sciences Pub Date : 2023-02-23 DOI:10.5194/ms-14-77-2023

W.M. Ding, J. Xie

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Abstract

Abstract. Harvesting energy from human body motion to supply electricity for wearable devices is focused on in this paper. Based on the fact that the frequency of human body motion is lower and the motions of different human body parts are variable, a piezoelectric energy harvester subjected to two different transversal reciprocating excitations is studied in this paper. Each excitation is treated as a transverse rheonomic constraint. The dynamics equation of the beam is established using the Hamiltonian principle. Expressing the transverse rheonomic constraint as a periodic function, closed-form solutions of the dynamics equation are obtained. And the characteristics of energy harvesters are investigated based on the closed-form solutions. The results show that the difference between the two excitations will certainly cause the energy harvester to generate more output power at lower frequencies of excitations, and the larger the difference, the more the output power will be generated. This unusual characteristic at the lower frequency enables the proposed harvester to be quite suitable to harvest energy from the motions of the human body.

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一种用于人体在两种不同的横向往复激励下运动的压电能量采集器

摘要本文重点研究了从人体运动中获取能量，为可穿戴设备供电的方法。基于人体运动频率较低和人体不同部位运动变化的特点，研究了一种受两种不同横向往复激励的压电能量采集器。每个激励都被视为横向流变约束。利用哈密顿原理建立了梁的动力学方程。将横向流变约束表示为非周期函数，得到了动力学方程的闭型解。在此基础上，研究了能量采集器的特性。结果表明，两种激励之间的差异必然会导致能量采集器在较低激励频率下产生更多的输出功率，并且差异越大，输出功率越大。这种不寻常的低频特性使所提出的收割机非常适合从人体的运动中收集能量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Mechanical Sciences ENGINEERING, MECHANICAL-

CiteScore

2.20

自引率

7.10%

发文量

审稿时长

29 weeks

期刊介绍： The journal Mechanical Sciences (MS) is an international forum for the dissemination of original contributions in the field of theoretical and applied mechanics. Its main ambition is to provide a platform for young researchers to build up a portfolio of high-quality peer-reviewed journal articles. To this end we employ an open-access publication model with moderate page charges, aiming for fast publication and great citation opportunities. A large board of reputable editors makes this possible. The journal will also publish special issues dealing with the current state of the art and future research directions in mechanical sciences. While in-depth research articles are preferred, review articles and short communications will also be considered. We intend and believe to provide a means of publication which complements established journals in the field.