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Proceedings Paper

Characterization of micro-generators embedded in commercial-off-the-shelf watches for wearable energy harvesting
Author(s): Tiancheng Xue; Shantnu Kakkar; Qianyu Lin; Shad Roundy
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Paper Abstract

This paper presents the characterization of the micro-generators embedded in Commercial-Off-The-Shelf (COTS) watches based on a generalized rotational energy harvester model which predicts the upper bound on energy generation given certain system constraints and specific inputs. We augment this generalized model to represent the actual micro-generator used in the Seiko Kinetic watch with realistic damping coefficients which allow us to identify optimizations to move the system output towards the upper bound. We have developed a mobile data logging platform which captures 6 DOF inertia data and the voltage output from the micro-generator simultaneously. We have asked 6 subjects to conduct a series of daily activities with the platform worn on different locations of the body. This effort not only serves as the experimental validation of our model but also provides insight into the state of the art in wearable kinetic energy harvesting devices that are commercially available. Finally we identify the opportunity for improvement on energy generation and show that we can increase the power by reducing the mechanical damping in the system, which might require an alternative mechanism with inherent lower friction.

Paper Details

Date Published: 16 April 2016
PDF: 8 pages
Proc. SPIE 9801, Industrial and Commercial Applications of Smart Structures Technologies 2016, 98010O (16 April 2016); doi: 10.1117/12.2218993
Show Author Affiliations
Tiancheng Xue, The Univ. of Utah (United States)
Shantnu Kakkar, The Univ. of Utah (United States)
Qianyu Lin, Duke Univ. (United States)
Shad Roundy, The Univ. of Utah (United States)

Published in SPIE Proceedings Vol. 9801:
Industrial and Commercial Applications of Smart Structures Technologies 2016
Steven F. Griffin, Editor(s)

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