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.
Tiancheng Xue, Shantnu Kakkar, Qianyu Lin, and Shad Roundy, "Characterization of micro-generators embedded in commercial-off-the-shelf watches for wearable energy harvesting," Proc. SPIE 9801, Industrial and Commercial Applications of Smart Structures Technologies 2016, 98010O (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 22, 2016; Published: 16 April 2016); https://doi.org/10.1117/12.2218993.
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