Imperial College London
Portrait Picture

ProfessorHailingFu

Faculty of Engineering, Department of Aeronautics

Visiting Researcher
 
 
 
//

Contact

 

h.fu14 Website CV

 
 
//

Location

 

420City and Guilds BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Fu:2019:10.1016/j.ymssp.2018.04.043,
author = {Fu, H and Yeatman, E},
doi = {10.1016/j.ymssp.2018.04.043},
journal = {Mechanical Systems and Signal Processing},
pages = {229--244},
title = {Rotational energy harvesting using bi-stability and frequency up-conversion for low-power sensing applications: Theoretical modelling and experimental validation.},
url = {http://dx.doi.org/10.1016/j.ymssp.2018.04.043},
volume = {125},
year = {2019}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Abstract Kinetic energy harvesting has drawn great attention in the past decade, but low-frequency and broadband operation is still a big issue which impedes this technology to be widely deployed in low-power Internet of Things applications. In this paper, theoretical modelling and experimental validation of a rotational harvester with bi-stability and frequency up-conversion is presented for harnessing low-frequency kinetic energy with a wide bandwidth. Piezoelectric transduction was adopted to convert the rotational kinetic energy into electricity. Distributed-parameter modelling was employed for analyzing the electromechanical dynamics of the bistable piezoelectric beam. Bistable and frequency up-converting behaviours were considered in the theoretical model by introducing two external input magnetic forces. Different oscillating modes were analyzed, showing the variation of power generation capability under different modes, and the advantage of operating in the periodic double-well mode. From the potential well study, we got a conclusion that for the same input magnetic force, periodic double-well mode is capable of achieving a larger vibration amplitude compared to a harvester without bi-stability. Asymmetric potential well shapes were investigated. This asymmetric shape provides a way to stabilize the initiation position of the beam for each plucking cycle, and eventually to stabilized the output. Key design factors to control the oscillating modes were studied, providing a guideline for future design. An experimental study was conducted to verify the theoretical results. A close match was achieved. This bistable harvester demonstrated a significant improvement (up to 2 × ) compared to a harvester without bi-stability over a wide bandwidth (from 1 to 11Hz) at low frequencies, when operating in the periodic double-well mode. This paper presents a detailed theoretical model and in-depth analysis of a bistable frequency up-converting harvester, providing a
AU  - Fu,H
AU  - Yeatman,E
DO  - 10.1016/j.ymssp.2018.04.043
EP  - 244
PY  - 2019///
SN  - 0888-3270
SP  - 229
TI  - Rotational energy harvesting using bi-stability and frequency up-conversion for low-power sensing applications: Theoretical modelling and experimental validation.
T2  - Mechanical Systems and Signal Processing
UR  - http://dx.doi.org/10.1016/j.ymssp.2018.04.043
UR  - https://www.sciencedirect.com/science/article/pii/S0888327018302450?via%3Dihub
UR  - http://hdl.handle.net/10044/1/59279
VL  - 125
ER  -
Download