Wearable inertial energy harvester with sputtered bimorph lead zirconate titanate (PZT) thin-film beams

Tiancheng Xue, Hong Goo Yeo, Susan Trolier-Mckinstry, Shad Roundy

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Energy harvesting from human motion addresses the growing need for self-powered wearable health monitoring systems which require 24/7 operation. Human motion is characterized by low and irregular frequencies, large amplitudes, and multi-axial motion, all of which limit the performance of conventional translational energy harvesters. An eccentric rotor-based rotational approach originally used in self-winding watches has been adopted to address the challenge. This paper presents a three-dimensional generalized rotational harvester model that considers both linear and rotational excitations. A hypothetical power upper bound for such architectures derived using this generalized model demonstrated the possibility for harvesting significantly more energy compared to existing devices. A wrist-worn piezoelectric rotational energy harvester was designed and fabricated attempting to narrow this gap between existing devices and the theoretical upper bound. The harvester utilizes sputtered bimorph PZT/nickel/PZT thin-film beams to accommodate the need for both flexibility and high piezoelectric figure of merit in order to realize a multi-beam wearable harvester. The prototype was characterized using a bench-top swing arm set-up to validate the system-level model, which provides many degrees of freedom for optimization.

Original languageEnglish (US)
Article number085026
JournalSmart Materials and Structures
Volume27
Issue number8
DOIs
StatePublished - Jul 25 2018

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Harvesters
Thin films
thin films
systems health monitoring
wrist
energy
eccentrics
figure of merit
clocks
Energy harvesting
seats
rotors
Watches
flexibility
Nickel
degrees of freedom
prototypes
nickel
low frequencies
Rotors

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering

Cite this

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title = "Wearable inertial energy harvester with sputtered bimorph lead zirconate titanate (PZT) thin-film beams",
abstract = "Energy harvesting from human motion addresses the growing need for self-powered wearable health monitoring systems which require 24/7 operation. Human motion is characterized by low and irregular frequencies, large amplitudes, and multi-axial motion, all of which limit the performance of conventional translational energy harvesters. An eccentric rotor-based rotational approach originally used in self-winding watches has been adopted to address the challenge. This paper presents a three-dimensional generalized rotational harvester model that considers both linear and rotational excitations. A hypothetical power upper bound for such architectures derived using this generalized model demonstrated the possibility for harvesting significantly more energy compared to existing devices. A wrist-worn piezoelectric rotational energy harvester was designed and fabricated attempting to narrow this gap between existing devices and the theoretical upper bound. The harvester utilizes sputtered bimorph PZT/nickel/PZT thin-film beams to accommodate the need for both flexibility and high piezoelectric figure of merit in order to realize a multi-beam wearable harvester. The prototype was characterized using a bench-top swing arm set-up to validate the system-level model, which provides many degrees of freedom for optimization.",
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Wearable inertial energy harvester with sputtered bimorph lead zirconate titanate (PZT) thin-film beams. / Xue, Tiancheng; Yeo, Hong Goo; Trolier-Mckinstry, Susan; Roundy, Shad.

In: Smart Materials and Structures, Vol. 27, No. 8, 085026, 25.07.2018.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Xue, Tiancheng

AU - Yeo, Hong Goo

AU - Trolier-Mckinstry, Susan

AU - Roundy, Shad

PY - 2018/7/25

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