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Design of a linearized magnetic spring for body-worn inertial energy harvesters

Design of a linearized magnetic spring for body-worn inertial energy harvesters
Design of a linearized magnetic spring for body-worn inertial energy harvesters
A potential method for powering body-worn sensors is that of inertial energy harvesting; extracting energy from the movement of the human body. However, the frequencies typically present are <5 Hz, hence requiring physically large devices. A promising solution utilizes a magnetic spring, but these exhibit a non-linear relationship between force (and hence resonant frequency) and displacement. This paper describes a design for implementing a linearized magnetic spring. Finite element analysis is used to model this device and compare against those reported in the literature. Simulation results indicate that, compared to the state-of-the-art, this design exhibits improved linearity (2%) across a wider displacement range (±25 mm). A prototype has been fabricated, and the simulation results experimentally validated.
Huang, Hui
ae101bbc-d3d7-4bbd-a3ac-55ee4c0f8118
Merrett, Geoff V.
89b3a696-41de-44c3-89aa-b0aa29f54020
White, Neil M.
c7be4c26-e419-4e5c-9420-09fc02e2ac9c
Huang, Hui
ae101bbc-d3d7-4bbd-a3ac-55ee4c0f8118
Merrett, Geoff V.
89b3a696-41de-44c3-89aa-b0aa29f54020
White, Neil M.
c7be4c26-e419-4e5c-9420-09fc02e2ac9c

Huang, Hui, Merrett, Geoff V. and White, Neil M. (2012) Design of a linearized magnetic spring for body-worn inertial energy harvesters At International Workshop on Algorithms and Concepts for Networked Sensing Systems Powered by Energy Harvesters (EnHaNSS'12), Belgium. 11 - 14 Jun 2012. 4 pp.

Record type: Conference or Workshop Item (Paper)

Abstract

A potential method for powering body-worn sensors is that of inertial energy harvesting; extracting energy from the movement of the human body. However, the frequencies typically present are <5 Hz, hence requiring physically large devices. A promising solution utilizes a magnetic spring, but these exhibit a non-linear relationship between force (and hence resonant frequency) and displacement. This paper describes a design for implementing a linearized magnetic spring. Finite element analysis is used to model this device and compare against those reported in the literature. Simulation results indicate that, compared to the state-of-the-art, this design exhibits improved linearity (2%) across a wider displacement range (±25 mm). A prototype has been fabricated, and the simulation results experimentally validated.

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Submitted date: 26 April 2012
Published date: June 2012
Additional Information: (c) 2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.978-1-4673-1786-3/12/$31.00 (c)2012 IEEE.
Venue - Dates: International Workshop on Algorithms and Concepts for Networked Sensing Systems Powered by Energy Harvesters (EnHaNSS'12), Belgium, 2012-06-11 - 2012-06-14
Organisations: Electronic & Software Systems, EEE

Identifiers

Local EPrints ID: 337543
URI: http://eprints.soton.ac.uk/id/eprint/337543
PURE UUID: daba1d02-865d-4672-b803-4f783f5cbd54
ORCID for Geoff V. Merrett: ORCID iD orcid.org/0000-0003-4980-3894
ORCID for Neil M. White: ORCID iD orcid.org/0000-0003-1532-6452

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Date deposited: 26 Apr 2012 17:35
Last modified: 18 Jul 2017 06:02

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Contributors

Author: Hui Huang
Author: Geoff V. Merrett ORCID iD
Author: Neil M. White ORCID iD

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